一、通過Zxing生成與讀取：

• 生成二維碼：

     int width=300;
     int height=300;
     String format="png";
     String content="www.link.com";
     
     HashMap hint=new HashMap();
     hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
     hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
     hint.put(EncodeHintType.MARGIN, 2);
     
     BitMatrix bitMatrix=new MultiFormatWriter().
     encode(content, BarcodeFormat.QR_CODE, width, height,hint);  
     Path file=new File("D:/img.png").toPath();
     MatrixToImageWriter.writeToPath(bitMatrix, format, file);
   
  

注：此處生成掃描是"www.link.com",新增為連結時轉到連結

• 讀取二維碼：

    MultiFormatReader formatReader=new MultiFormatReader(); 
     File file=new File("D:/img.png");  
     BufferedImage image=ImageIO.read(file); 
     BinaryBitmap binaryBitmap=new BinaryBitmap(
       new HybridBinarizer(new BufferedImageLuminanceSource(image)));
     
     
     HashMap hint=new HashMap();
     hint.put(EncodeHintType.CHARACTER_SET, "utf-8");
     Result result=formatReader.decode(binaryBitmap,hint);
     
     System.out.println(result.toString());
     System.out.println(result.getBarcodeFormat());
     System.out.println(result.getText());
   
  

  二、QRcode生成二維碼：

  • 生成二維碼：

     Qrcode x=new Qrcode();
     x.setQrcodeErrorCorrect('M');
     x.setQrcodeEncodeMode('B');
        x.setQrcodeVersion(7);
        String qrData="www.imooc.com";
        int width=67+12*(7-1);
        int height=67+12*(7-1);
        int pixoff=2;
    
     BufferedImage bufferedImage=
     new BufferedImage
     (300, 300, BufferedImage.TYPE_INT_RGB);  
      Graphics2D gs=bufferedImage.createGraphics();
     gs.setBackground(Color.WHITE);
     gs.setColor(Color.BLACK);
     gs.clearRect(0, 0, width, height);
       
       byte[] d=qrData.getBytes("gb2312");
       if(d.length>0&&d.length<120){
             boolean[][] s=x.calQrcode(d); 
            for(int i=0;i<s.length;i++){
                for(int j=0;j<s.length;j++){
                     if(s[j][i]){
                      gs.fillRect(j*3+pixoff, i*3+pixoff, 3, 3);
                    }
              }
          }
    }
    gs.dispose();
    bufferedImage.flush();
    ImageIO.write(bufferedImage, "png", new File("D:/qrcode.png"));
     
    

  • 讀取二維碼：

       public class ReadQRcode {
       public static void main(String[] args) throws IOException {
       	File file=new File("D:/qrcode.png"); 
       	BufferedImage bufferedImage=ImageIO.read(file); 
       	QRCodeDecoder codeDecoder=new QRCodeDecoder();
      	 String  result=
      	 new String(codeDecoder.decode(
      	 new QRcodeImage(bufferedImage)),"gb2312");
      	 System.out.println(result); 
     	 }
     }
     class QRcodeImage implements QRCodeImage{
     	BufferedImage bufferedImage;
     	 public QRcodeImage(BufferedImage bufferedImage) {
     		  this.bufferedImage=bufferedImage;
     	 }
      @Override
      public int getHeight() {
       return bufferedImage.getHeight();
      }
      @Override
    public int getPixel(int arg0, int arg1) {
     	  return bufferedImage.getRGB(arg0, arg1);
    }
     @Override
     public int getWidth() {
     	return bufferedImage.getWidth();
     }}
    

  三、jquery.qrcode.min.js生成二維碼：

     在jsp頁面引入：
       	<script type="text/javascript" src="js/jquery.min.js"></script>
   		<script type="text/javascript" 
   		src="js/jquery.qrcode.min.js"></script> 
   			  
   		 生成二維碼：<br>
   		 <div id="qrcode"></div> 
   		 <script type="text/javascript">
   		  jQuery('#qrcode').qrcode("www.imooc.com");
   		 </script>