Java实现二维码QRCode的编码和解码

来源：互联网发布：pc软件编辑：程序博客网时间：2024/06/05 14:09

涉及到的一些主要类库，方便大家下载：

编码 lib：Qrcode_swetake.jar （官网介绍 -- http://www.swetake.com/qr/index-e.html）
解码 lib：qrcode.jar （官网介绍 -- http://sourceforge.jp/projects/qrcode/）

【一】、编码：

QRCodeEncoderHandler.java

 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.com15  * @author Michael16  */17 public class QRCodeEncoderHandler {18 19     /**20      * 生成二维码(QRCode)图片21      * @param content22      * @param imgPath23      */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 > BLACK44             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 arguments79      */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 }

【二】、解码：
QRCodeDecoderHandler.java

 1 package michael.qrcode; 2  3 import java.awt.image.BufferedImage; 4 import java.io.File; 5 import java.io.IOException; 6  7 import javax.imageio.ImageIO; 8  9 import jp.sourceforge.qrcode.QRCodeDecoder;10 import jp.sourceforge.qrcode.data.QRCodeImage;11 import jp.sourceforge.qrcode.exception.DecodingFailedException;12 13 /**14  * @blog http://sjsky.iteye.com15  * @author Michael16  */17 public class QRCodeDecoderHandler {18 19     /**20      * 解码二维码21      * @param imgPath22      * @return String23      */24     public String decoderQRCode(String imgPath) {25 26         // QRCode 二维码图片的文件27         File imageFile = new File(imgPath);28 29         BufferedImage bufImg = null;30         String decodedData = null;31         try {32             bufImg = ImageIO.read(imageFile);33 34             QRCodeDecoder decoder = new QRCodeDecoder();35             decodedData = new String(decoder.decode(new J2SEImage(bufImg)));36 37             // try {38             // System.out.println(new String(decodedData.getBytes("gb2312"),39             // "gb2312"));40             // } catch (Exception e) {41             // // TODO: handle exception42             // }43         } catch (IOException e) {44             System.out.println("Error: " + e.getMessage());45             e.printStackTrace();46         } catch (DecodingFailedException dfe) {47             System.out.println("Error: " + dfe.getMessage());48             dfe.printStackTrace();49         }50         return decodedData;51     }52 53     /**54      * @param args the command line arguments55      */56     public static void main(String[] args) {57         QRCodeDecoderHandler handler = new QRCodeDecoderHandler();58         String imgPath = "d:/test/twocode/Michael_QRCode.png";59         String decoderContent = handler.decoderQRCode(imgPath);60         System.out.println("解析结果如下：");61         System.out.println(decoderContent);62         System.out.println("========decoder success!!!");63     }64 65     class J2SEImage implements QRCodeImage {66         BufferedImage bufImg;67 68         public J2SEImage(BufferedImage bufImg) {69             this.bufImg = bufImg;70         }71 72         public int getWidth() {73             return bufImg.getWidth();74         }75 76         public int getHeight() {77             return bufImg.getHeight();78         }79 80         public int getPixel(int x, int y) {81             return bufImg.getRGB(x, y);82         }83 84     }85 }

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