servlet网页生成二维码

java代码

package Utill;  

import java.awt.Color;  
import java.awt.Graphics2D;  
import java.awt.image.BufferedImage;  

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

import com.swetake.util.Qrcode;  


public class QR {  

    public void encoderQRCoder(String content, HttpServletResponse response) {  

        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(7);   
                       // 获得内容的字节数组，设置编码格式
                       byte[] contentBytes = content.getBytes("utf-8");  
                       //构造一个BufferedImage对象 设置宽、高
                       BufferedImage bufImg = new BufferedImage(140, 140, BufferedImage.TYPE_INT_RGB);  
                       Graphics2D gs = bufImg.createGraphics(); 

                       gs.setBackground(Color.WHITE);  
                       gs.clearRect(0, 0, 140, 140);  
                       // 设定图像颜色  BLACK  
                       gs.setColor(Color.BLACK);  
                       // 设置偏移量 不设置可能导致解析出错  
                       int pixoff = 2;  
                       // 输出内容  二维码  
                       if (contentBytes.length > 0 && contentBytes.length < 120) {  
                           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);  
                                   }  
                               }  
                           } 
                           System.out.println("生成成功");
                       } else {  
                           System.err.println("QRCode content bytes length = "+ contentBytes.length + " not in [ 0,120 ]. ");  
                       }  
                       //实例化一个Image对象。

                       ImageIO.write(bufImg, "jpg", response.getOutputStream());  
                   }catch (Exception e){  
                       e.printStackTrace();  
                   }
        }
    }  

servlet代码

package snippet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import domain.URL;

import Utill.QR;

public class testQR extends HttpServlet {

    static String content;
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

            QR encoder = new QR();  
            encoder.encoderQRCoder(content, response);  
    }
}