javaweb二维码

QRCode.java程序

package my;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.swetake.util.Qrcode;

public class QRCode extends HttpServlet{
    //重写HttpServlet里面的service方法(请求对象，相应对象)
    public void service(HttpServletRequest request, HttpServletResponse response){
        try {
            request.setCharacterEncoding("utf-8");//设置接收字符的编码
            String content=request.getParameter("content");//得到文本框中的类容
            Qrcode qrcode=new Qrcode();//创建Qrcode对象
            qrcode.setQrcodeErrorCorrect('M');//设置排错率 L%7 M%15 Q%25 H%30
            qrcode.setQrcodeEncodeMode('B');//设置编码 B为二维码
            qrcode.setQrcodeVersion(7);//设置版本号1-40
            //先以ISO-8859-1解码（默认编码），转化成UTF-8编码字符编码的转换
            byte[] bt = new String(content.getBytes("ISO-8859-1"),"UTF-8").getBytes();
            //创建图像数据的缓冲区
            //BufferedImage.TYPE_INT_BGR 创建一个具有8位RGB颜色的分量图片
            BufferedImage image = new BufferedImage(140,140,BufferedImage.TYPE_INT_BGR);
            //创建画笔工具
            Graphics2D g2D = image.createGraphics();
            //设置颜色
            g2D.setBackground(Color.WHITE);
            //绘制矩形
            g2D.clearRect(0, 0, 140, 140);
            //绘制前景色
            g2D.setColor(Color.BLACK);
            
            if(bt.length > 0){
                //返回二维码的数据
                boolean[][] s = qrcode.calQrcode(bt);
                for(int i = 0; i < s.length; i++){
                    for(int j = 0; j < s.length; j++){
                        if(s[j][i]){
                            //布尔数组填充图片
                            g2D.fillRect(j * 3 + 2, i * 3 + 2, 3, 3);
                            
                        }
                    }
                }
            }
            g2D.dispose();//释放画笔
            image.flush();//残留数据推出缓冲区
            //以流的方式将image二维码输出
            ImageIO.write(image, "jpg", response.getOutputStream());
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

index.jsp

<%@ page language="java"  pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <script type="text/javascript">
        function qrcode(){
            var value=document.getElementById('content').value;
            var image=document.getElementById('image');
            image.src='qr.do?content='+value;    
        }
    </script>
  </head>
  
  <body>
       <input type="text" id="content" width=100px height= 100px/>
       <input type="button" value="生成二维码" onclick="qrcode()"/>
       <img id="image" />
  </body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- 定义一个servlet -->
  <servlet>
      <servlet-name>qrcode</servlet-name>
      <servlet-class>my.QRCode</servlet-class>
  </servlet>
  
  <servlet-mapping>
      <servlet-name>qrcode</servlet-name>
      <url-pattern>/qr.do</url-pattern>
  </servlet-mapping>
</web-app>

 

posted @ 2014-10-13 00:30  肉球  阅读(374)  评论(0)  编辑  收藏  举报