链接生成动态二维码图片显示在页面上

//引入jar包  core-3.3.0.jar  地址

http://jareye.com/jar/list.html?q=BarcodeFormat

// js绑定二维码到页面

var url="www.baidu.com";

$("#showVcode").append("<img src='/工程名/app/createCodes?url="+url+"' width='150rem' height='150rem'/>");

//控制层

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import java.io.IOException;
import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.bind.annotation.ResponseBody;
import com.google.zxing.WriterException;
import com.neusoft.sr.app.service.appCreateCodeService;

@Controller
@RequestMapping("/app")
public class appCreateCodeController {

     @Resource
     private appCreateCodeService appCreateCodeService;
    
     @RequestMapping("/createCodes")
     @ResponseBody
     public void createCode(String url,HttpServletResponse response)  
             throws ServletException, IOException, WriterException {  
      //HttpSession session = requset.getSession(true)
      //String parameter = requset.getParameter("url");
      System.out.println(url);
         //设置响应的类型格式为图片格式
         response.setContentType("image/jpeg");
         // 禁止图像缓存。
         response.setHeader("Pragma", "no-cache");
         response.setHeader("Cache-Control", "no-cache");
         response.setDateHeader("Expires", 0);
         try {
             appCreateCodeService.createQrCode(response.getOutputStream(),url,900,"JPEG");
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
     }  
}

//业务层

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import org.springframework.stereotype.Service;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

@Service
public class appCreateCodeService {

      /**
    37      * 生成包含字符串信息的二维码图片
    38      * @param outputStream 文件输出流路径
    39      * @param content 二维码携带信息
    40      * @param qrCodeSize 二维码图片大小
    41      * @param imageFormat 二维码的格式
    42      * @throws WriterException 
    43      * @throws IOException 
    44      */
    
     public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{  
         //设置二维码纠错级别ＭＡＰ
         Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();  
         hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别  
         QRCodeWriter qrCodeWriter = new QRCodeWriter();  
         //创建比特矩阵(位矩阵)的QR码编码的字符串  
         BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);  
         // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)
         int matrixWidth = byteMatrix.getWidth();  
         BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);  
         image.createGraphics();  
         Graphics2D graphics = (Graphics2D) image.getGraphics();  
         graphics.setColor(Color.WHITE);  
         graphics.fillRect(0, 0, matrixWidth, matrixWidth);  
         //使用比特矩阵画并保存图像
         graphics.setColor(Color.BLACK);  
         for (int i = 0; i < matrixWidth; i++){
           for (int j = 0; j < matrixWidth; j++){
                 if (byteMatrix.get(i, j)){
                     graphics.fillRect(i-100, j-100, 1, 1);  
                 }
             }
        }
         return ImageIO.write(image, imageFormat, outputStream);  
    }  
}