Java实现二维码QRCode的编码和解码

 1 package michael.qrcode;
 2 
 3 import java.awt.Color;
 4 import java.awt.Graphics2D;
 5 import java.awt.image.BufferedImage;
 6 import java.io.File;
 7 
 8 import javax.imageio.ImageIO;
 9 
10 import com.swetake.util.Qrcode;
11 
12 /**
13  * 二维码生成器
14  * @blog http://sjsky.iteye.com
15  * @author Michael
16  */
17 public class QRCodeEncoderHandler {
18 
19     /**
20      * 生成二维码(QRCode)图片
21      * @param content
22      * @param imgPath
23      */
24     public void encoderQRCode(String content, String imgPath) {
25         try {
26 
27             Qrcode qrcodeHandler = new Qrcode();
28             qrcodeHandler.setQrcodeErrorCorrect(‘M‘);
29             qrcodeHandler.setQrcodeEncodeMode(‘B‘);
30             qrcodeHandler.setQrcodeVersion(7);
31 
32             System.out.println(content);
33             byte[] contentBytes = content.getBytes("gb2312");
34 
35             BufferedImage bufImg = new BufferedImage(140, 140,
36                     BufferedImage.TYPE_INT_RGB);
37 
38             Graphics2D gs = bufImg.createGraphics();
39 
40             gs.setBackground(Color.WHITE);
41             gs.clearRect(0, 0, 140, 140);
42 
43             // 设定图像颜色 > BLACK
44             gs.setColor(Color.BLACK);
45 
46             // 设置偏移量 不设置可能导致解析出错
47             int pixoff = 2;
48             // 输出内容 > 二维码
49             if (contentBytes.length > 0 && contentBytes.length < 120) {
50                 boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
51                 for (int i = 0; i < codeOut.length; i++) {
52                     for (int j = 0; j < codeOut.length; j++) {
53                         if (codeOut[j][i]) {
54                             gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
55                         }
56                     }
57                 }
58             } else {
59                 System.err.println("QRCode content bytes length = "
60                         + contentBytes.length + " not in [ 0,120 ]. ");
61             }
62 
63             gs.dispose();
64             bufImg.flush();
65 
66             File imgFile = new File(imgPath);
67 
68             // 生成二维码QRCode图片
69             ImageIO.write(bufImg, "png", imgFile);
70 
71         } catch (Exception e) {
72             e.printStackTrace();
73         }
74 
75     }
76 
77     /**
78      * @param args the command line arguments
79      */
80     public static void main(String[] args) {
81         String imgPath = "D:/test/twocode/Michael_QRCode.png";
82 
83         String content = "Hello 大大、小小,welcome to QRCode!"
84                 + "\nMyblog [ http://sjsky.iteye.com ]"
85                 + "\nEMail [ sjsky007@gmail.com ]" + "\nTwitter [ @suncto ]";
86 
87         QRCodeEncoderHandler handler = new QRCodeEncoderHandler();
88         handler.encoderQRCode(content, imgPath);
89 
90         System.out.println("encoder QRcode success");
91     }
92 }