Java生成二维码(案例源码)

今天药忘吃喽~ 2022-04-13 12:40 350阅读 0赞

index.jsp代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <title>生成二维码</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    </head>
    <script type="text/javascript">
    	function check() {
    		var content = document.getElementById("content").value;
    		if (content.length == 0 || content.length - 80 > 0) {
    			alert("请输入1-80长度内容，当前长度:" + content.length);
    			return false;
    		}
    		document.getElementById("createEwmForm").submit();
    		return true;
    	}
    </script>
    <body>
    	<div align="center">
    		<form method="post" id="createEwmForm"
    			action="qrcode_getQRcodeImg.action">
    			<textarea rows="5" cols="30" name="content" id="content"></textarea>
    			<p>
    				<input type="button" οnclick="check()" name="ewmCreate"
    					id="ewmCreate" value="生成二维码" />
    		</form>
    		<img alt="二维码" src="img/ewm.png">
    	</div>
    </body>
    </html>

struts.xml代码

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
    	<package name="qrcode" extends="struts-default">
    		<action name="qrcode_*" class="com.singlee.action.QRcodeAction"
    			method="{1}">
    			<result name="ok">/index.jsp
    			</result>
    			<result name="no">/error.jsp
    			</result>
    		</action>
    	</package>
    </struts>

CreateEwm.java代码

package com.singlee.util;
    
    import java.awt.Color;
    import java.awt.Graphics2D;
    import java.awt.image.BufferedImage;
    
    import com.swetake.util.Qrcode;
    
    /**
     * 
     * @author mingzl
     * @function 生成二维码
     * 
     */
    public class CreateEwm {
    
    	/**
    	 * 生成二维码(QRCode)图片的公共方法
    	 * 
    	 * @param content
    	 *            存储内容
    	 * @param size
    	 *            二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大
    	 * @return
    	 */
    	public BufferedImage qrCodeCommon(String content, int size) {
    		BufferedImage bufImg = null;
    		try {
    			Qrcode qrcodeHandler = new Qrcode();
    			// 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
    			qrcodeHandler.setQrcodeErrorCorrect('M');
    			qrcodeHandler.setQrcodeEncodeMode('B');
    			// 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大
    			qrcodeHandler.setQrcodeVersion(size);
    			// 获得内容的字节数组，设置编码格式
    			byte[] contentBytes = content.getBytes("utf-8");
    			// 图片尺寸
    			int imgSize = 67 + 12 * (size - 1);
    			bufImg = new BufferedImage(imgSize, imgSize,
    					BufferedImage.TYPE_INT_RGB);
    			Graphics2D gs = bufImg.createGraphics();
    			// 设置背景颜色：白色
    			gs.setBackground(Color.WHITE);
    			gs.clearRect(0, 0, imgSize, imgSize);
    			// 设定图像颜色：黑色
    			gs.setColor(Color.BLACK);
    			// 设置偏移量
    			int pixoff = 2;
    			// 输出内容：二维码
    			if (contentBytes.length > 0 && contentBytes.length < 800) {
    				boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
    				for (int i = 0; i < codeOut.length; i++) {
    					for (int j = 0; j < codeOut.length; j++) {
    						if (codeOut[j][i]) {
    							gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
    						}
    					}
    				}
    			} else {
    				throw new Exception("QRCode content bytes length = "
    						+ contentBytes.length + " not in [0, 800].");
    			}
    			gs.dispose();
    			bufImg.flush();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return bufImg;
    	}
    
    }

QRcodeAction代码

package com.singlee.action;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    
    import javax.imageio.ImageIO;
    
    import com.opensymphony.xwork2.ActionSupport;
    import com.singlee.util.CreateEwm;
    
    public class QRcodeAction extends ActionSupport {
    
    	private static final long serialVersionUID = 1L;
    	private String content;
    
    	public String getContent() {
    		return content;
    	}
    
    	public void setContent(String content) {
    		this.content = content;
    	}
    
    	public String getQRcodeImg() {
    		CreateEwm ce = new CreateEwm();
    		int size = (content.getBytes().length - 1) / 20;
    		if (size >= 40) {
    			return "no";
    		}
    		size = size < 5 ? 5 : size;
    		BufferedImage bi = ce.qrCodeCommon(content, size);
    		try {
    			String upPath = this.getClass().getClassLoader().getResource("")
    					.getPath().replace("WEB-INF/classes", "img");
    			ImageIO.write(bi, "png", new File(upPath + "/ewm.png"));
    		} catch (IOException e) {
    			e.printStackTrace();
    			return "no";
    		}
    		return "ok";
    	}
    }

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