关于web浏览器下载上传的那些事

一时失言乱红尘 2023-08-17 15:53 60阅读 0赞

**1、一秒刷新页面一次**

> response.setHeader("refresh","1");

**2、二秒跳到其他页面**

> response.setHeader("refresh","2;URL=otherPagename");

**3、没有缓存：**

> response.setHeader("Pragma", "No-cache");  
> response.setHeader("Cache-Control", "no-cache");

**4、设置过期的时间期限**

> response.setDateHeader("Expires", System.currentTimeMillis()+自己设置的时间期限);

**5、访问别的页面：**

> response.setStatus（302）; response.setHeader("location","url");

**6、下载文件**

> **Content-Type的作用：**该实体头的作用是让服务器告诉浏览器它发送的数据属于什么文件类型。
> 
> 例如：当Content-Type 的值设置为text/html和text/plain时,前者会让浏览器把接收到的实体内容以HTML格式解析,后者会让浏览器以普通文本解析.
> 
> **Content-Disposition 的作用：**当Content-Type 的类型为要下载的类型时 , 这个信息头会告诉浏览器这个文件的名字和类型
> 
> response.setHeader("Content-Type","video/x-msvideo");
> 
> response.setHeader( "Content-Disposition", "attachment;filename=" + new String( “文件名称”.getBytes("gb2312"), "ISO8859-1" ) );

**7、通知浏览器数据采用的压缩格式：**

> response.setHeader("Content-Encoding","压缩后的数据");

**高速浏览器压缩数据的长度：**

response.setHeader("Content-Length",压缩后的数据.length+"");

**8、高速浏览器图片或视频：**

> response.setHeader("Content-type","这个参数在tomcat里conf下的web.xml里面找");

inputstream in= this.getServletContext.getResourceAsStream("/2.jpg");
    int len=0;
    byte buffer[]= new byte[1024]
    
    outputStream out = response.getOutputStream();
    
    while(len=in.read(buffer)>0){
      out.write(buffer,0,len)
    }

**9、高速浏览器已下载的形式：**

response.setHeader("Content-disposition","attachment;filename=2.jpg");
    
    inputstream in= this.getServletContext.getResourceAsStream("/2.jpg");
    int len=0;
    byte buffer[]= new byte[1024]
    
    outputStream out = response.getOutputStream();
    
    while(len=in.read(buffer)>0){
      out.write(buffer,0,len)
    }

**10.常见的Content-Type**

<table> 
 <thead> 
 <tr> 
 <td style="vertical-align:top;"> 序号 </td> 
 <td style="vertical-align:top;"> 内容类型 </td> 
 <td style="vertical-align:top;"> 文件扩展名 </td> 
 <td style="vertical-align:top;"> 描述 </td> 
 </tr> 
 </thead> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;"> 1 </td> 
 <td style="vertical-align:top;"> application/msword </td> 
 <td style="vertical-align:top;"> doc </td> 
 <td style="vertical-align:top;"> Microsoft Word </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 2 </td> 
 <td style="vertical-align:top;"> application/octet-stream bin </td> 
 <td style="vertical-align:top;"> dms lha lzh exe class </td> 
 <td style="vertical-align:top;"> 可执行程序 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 3 </td> 
 <td style="vertical-align:top;"> application/pdf </td> 
 <td style="vertical-align:top;"> pdf </td> 
 <td style="vertical-align:top;"> Adobe Acrobat </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 4 </td> 
 <td style="vertical-align:top;"> application/postscript </td> 
 <td style="vertical-align:top;"> ai eps ps </td> 
 <td style="vertical-align:top;"> PostScript </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 5 </td> 
 <td style="vertical-align:top;"> appication/powerpoint </td> 
 <td style="vertical-align:top;"> ppt </td> 
 <td style="vertical-align:top;"> Microsoft Powerpoint </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 6 </td> 
 <td style="vertical-align:top;"> appication/rtf </td> 
 <td style="vertical-align:top;"> rtf </td> 
 <td style="vertical-align:top;"> rtf&nbsp;格式 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 7 </td> 
 <td style="vertical-align:top;"> appication/x-compress </td> 
 <td style="vertical-align:top;"> z </td> 
 <td style="vertical-align:top;"> unix&nbsp;压缩文件 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 8 </td> 
 <td style="vertical-align:top;"> application/x-gzip </td> 
 <td style="vertical-align:top;"> gz </td> 
 <td style="vertical-align:top;"> gzip </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 9 </td> 
 <td style="vertical-align:top;"> application/x-gtar </td> 
 <td style="vertical-align:top;"> gtar </td> 
 <td style="vertical-align:top;"> tar&nbsp;文档&nbsp;(gnu&nbsp;格式&nbsp;) </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 10 </td> 
 <td style="vertical-align:top;"> application/x-shockwave-flash </td> 
 <td style="vertical-align:top;"> swf </td> 
 <td style="vertical-align:top;"> MacroMedia Flash </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 11 </td> 
 <td style="vertical-align:top;"> application/x-tar </td> 
 <td style="vertical-align:top;"> tar </td> 
 <td style="vertical-align:top;"> tar(4.3BSD) </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 12 </td> 
 <td style="vertical-align:top;"> application/zip </td> 
 <td style="vertical-align:top;"> zip </td> 
 <td style="vertical-align:top;"> winzip </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 13 </td> 
 <td style="vertical-align:top;"> audio/basic </td> 
 <td style="vertical-align:top;"> au snd </td> 
 <td style="vertical-align:top;"> sun/next&nbsp;声音文件 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 14 </td> 
 <td style="vertical-align:top;"> audio/mpeg </td> 
 <td style="vertical-align:top;"> mpeg mp2 </td> 
 <td style="vertical-align:top;"> Mpeg&nbsp;声音文件 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 15 </td> 
 <td style="vertical-align:top;"> audio/x-aiff </td> 
 <td style="vertical-align:top;"> mid midi rmf </td> 
 <td style="vertical-align:top;"> Midi&nbsp;格式 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 16 </td> 
 <td style="vertical-align:top;"> audio/x-pn-realaudio </td> 
 <td style="vertical-align:top;"> ram ra </td> 
 <td style="vertical-align:top;"> Real Audio&nbsp;声音 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 17 </td> 
 <td style="vertical-align:top;"> audio/x-pn-realaudio-plugin </td> 
 <td style="vertical-align:top;"> rpm </td> 
 <td style="vertical-align:top;"> Real Audio&nbsp;插件 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 18 </td> 
 <td style="vertical-align:top;"> audio/x-wav </td> 
 <td style="vertical-align:top;"> wav </td> 
 <td style="vertical-align:top;"> Microsoft Windows&nbsp;声音 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 19 </td> 
 <td style="vertical-align:top;"> image/cgm </td> 
 <td style="vertical-align:top;"> cgm </td> 
 <td style="vertical-align:top;"> 计算机图形元文件 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 20 </td> 
 <td style="vertical-align:top;"> image/gif </td> 
 <td style="vertical-align:top;"> gif </td> 
 <td style="vertical-align:top;"> COMPUSERVE GIF&nbsp;图像 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 21 </td> 
 <td style="vertical-align:top;"> image/jpeg </td> 
 <td style="vertical-align:top;"> jpeg jpg jpe </td> 
 <td style="vertical-align:top;"> JPEG&nbsp;图像 </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> 22 </td> 
 <td style="vertical-align:top;"> image/png </td> 
 <td style="vertical-align:top;"> png </td> 
 <td style="vertical-align:top;"> PNG&nbsp;图像 </td> 
 </tr> 
 </tbody> 
</table>

**11. application/x-www-form-urlencoded**

> 最常见的 POST 提交数据的方式了。浏览器的原生 form 表单，如果不设置 enctype 属性，那么最终就会以 application/x-www-form-urlencoded方式提交数据。

**text/xml  
application/json  
multipart/form-data**

> 使用表单上传文件时，必须让 form 的 enctyped 等于这个值。  
> 并且Http协议会使用boundary来分割上传的参数