Web案例一：生成验证码

小咪咪 2022-02-09 12:29 296阅读 0赞

步骤：

[![wKiom1WiMETBW-e-AAG-ZNN9xFk845.jpg][]][wKiom1WiMETBW-e-AAG-ZNN9xFk845.jpg]

具体代码实现：

<table style="font-family:'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;"> 
 <tbody style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
  <tr style="font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
   <td style="font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(175,175,175);"> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      1 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      2 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      3 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      4 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      5 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      6 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      7 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      8 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      9 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      10 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      11 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      12 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      13 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      14 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      15 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      16 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      17 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      18 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      19 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      20 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      21 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      22 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      23 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      24 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      25 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      26 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      27 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      28 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      29 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      30 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      31 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      32 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      33 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      34 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      35 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      36 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      37 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      38 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      39 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      40 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      41 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      42 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      43 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      44 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      45 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      46 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      47 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      48 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      49 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      50 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      51 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      52 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      53 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      54 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      55 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      56 
    </div> 
    <div style="font-size:1em;background-image:none;border-width:0px 3px 0px 0px;border-right-style:solid;border-right-color:rgb(108,226,108);line-height:1.1em;text-align:right;vertical-align:baseline;">
      57 
    </div> </td> 
   <td style="font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
    <div style="font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//第1步：创建一个BufferedImage对象，即图片对象</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//定义图片的长和宽</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">width&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">200</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,height&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">50</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">BufferedImage&nbsp;image&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">new</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">BufferedImage(width,&nbsp;height,&nbsp;BufferedImage.TYPE_INT_ARGB);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//第2步：得到图片的画笔，强转成Graphics2D。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">Graphics2D&nbsp;pen&nbsp;=&nbsp;(Graphics2D)&nbsp;image.getGraphics();</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//填充图片，改变它的背景色。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.setColor(Color.DARK_GRAY);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.fillRect(</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">0</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">0</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,&nbsp;width,&nbsp;height);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//第3步：获得随机生成的字符</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//定义一个字符串，包括了几乎所有常见的字符。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">String&nbsp;words&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#0000FF;">"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6"</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//定义字符数组，用来存放随机取得的字符。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">char</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">[]&nbsp;chars&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">new</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">char</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">[</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">4</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">];</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//定义一个Random类，来生成随机的数字索引，利用charAt()方法获得字符。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">Random&nbsp;r&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">new</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">Random();</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">for</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">(</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">i&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">0</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;&nbsp;i&nbsp;&lt;&nbsp;chars.length;&nbsp;i++)</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">{ </code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">randomIndex&nbsp;=&nbsp;r.nextInt(words.length());</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">chars[i]&nbsp;=&nbsp;words.charAt(randomIndex);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">}</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//第4步：将字符画到图片上</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//个性化画笔</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.setColor(Color.YELLOW);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.setFont(</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">new</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">Font(</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#0000FF;">"楷体"</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,Font.PLAIN,</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">30</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">));</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.setBackground(Color.gray);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//定义字符放置的坐标</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">draw_x&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">20</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,draw_y&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">30</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">for</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">(</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">i&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">0</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;&nbsp;i&nbsp;&lt;&nbsp;chars.length;i++)</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">{ </code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//绘制随机字符</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//将画笔旋转一个随机的角度</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">double</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">theta&nbsp;=&nbsp;(r.nextDouble()*</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">60</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">-</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">30</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">)*Math.PI/</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">180</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//生成随机的正负30度的度数并转换成弧度。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//旋转画笔</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.rotate(theta,&nbsp;draw_x,&nbsp;draw_y);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.drawString(chars[i]+</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#0000FF;">""</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,&nbsp;draw_x,&nbsp;draw_y);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//复位画笔</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.rotate(-theta,&nbsp;draw_x,&nbsp;draw_y);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">draw_x&nbsp;+=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">40</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">}</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//其它修饰，如干扰线。</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">for</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">(</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">i&nbsp;=&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">0</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;&nbsp;i&nbsp;&lt;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,153,0);">4</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">;i++)</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">{ </code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//绘制干扰线</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">x1&nbsp;=&nbsp;r.nextInt(width);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">x2&nbsp;=&nbsp;r.nextInt(width);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">y1&nbsp;=&nbsp;r.nextInt(height);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;font-weight:bold;color:rgb(0,102,153);">int</code>&nbsp; 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">y2&nbsp;=&nbsp;r.nextInt(height);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.setColor(Color.magenta);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">pen.drawLine(x1,&nbsp;y1,&nbsp;x2,&nbsp;y2);</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">}</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code>&nbsp; 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//第5步：将图片写到输出流，通过ImageIO</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">ImageIO.write(image,&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#0000FF;">"png"</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:#000000;">,&nbsp;response.getOutputStream());</code> 
     </div> 
     <div style="font-size:1em;background-image:none;border:0px;line-height:1.1em;vertical-align:baseline;"> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code style="font-family:Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace;font-size:1em;background:none;border:0px;line-height:1.1em;vertical-align:baseline;color:rgb(0,130,0);">//outputStream最终是打印到请求页面的Img标签上</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

关于BufferedImage，可能新手都会有些疑惑，怎么设置它的背景色，怎么老是黑色？

BufferedImage的背景色，它自身没有办法实现，只能通过它的画笔来填充。

**当把验证码嵌入到页面当中，怎么实现看不清换一张呢？**

思路：利用脚本获得img，改变它的src并添加不同的参数，防止缓存。

关键代码如下：

本文转自屠夫章哥 51CTO博客，原文链接：http://blog.51cto.com/4259297/1673458 ，如需转载请自行联系原作者

[wKiom1WiMETBW-e-AAG-ZNN9xFk845.jpg]: /images/20220206/a84251435e6846439cb77c8e366ccf11.png