Java实现二维码QRCode的编码和解码

来源：互联网发布：守望先锋技能数据编辑：程序博客网时间：2024/05/17 04:02

涉及到的一些主要类库

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/）

编码：

QRCodeEncoderHandler.javaJava代码 package michael.qrcode; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; import com.swetake.util.Qrcode; /** * 二维码生成器 * @blog http://sjsky.iteye.com * @author Michael */ public class QRCodeEncoderHandler {     /**     * 生成二维码(QRCode)图片     * @param content     * @param imgPath     */     public void encoderQRCode(String content, String imgPath) {         try {             Qrcode qrcodeHandler = new Qrcode();             qrcodeHandler.setQrcodeErrorCorrect('M');             qrcodeHandler.setQrcodeEncodeMode('B');             qrcodeHandler.setQrcodeVersion(7);             System.out.println(content);             byte[] contentBytes = content.getBytes("gb2312");             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);                         }                     }                 }             } else {                 System.err.println("QRCode content bytes length = "                         + contentBytes.length + " not in [ 0,120 ]. ");             }             gs.dispose();             bufImg.flush();             File imgFile = new File(imgPath);             // 生成二维码QRCode图片             ImageIO.write(bufImg, "png", imgFile);         } catch (Exception e) {             e.printStackTrace();         }     }     /**     * @param args the command line arguments     */     public static void main(String[] args) {         String imgPath = "D:/test/twocode/Michael_QRCode.png";          String content = "Hello 大大、小小,welcome to QRCode!"                 + "\nMyblog [ http://sjsky.iteye.com ]"                 + "\nEMail [ sjsky007@gmail.com ]" + "\nTwitter [ @suncto ]";          QRCodeEncoderHandler handler = new QRCodeEncoderHandler();         handler.encoderQRCode(content, imgPath);          System.out.println("encoder QRcode success");     } }

运行后生成的二维码图片如下：

解码：

QRCodeDecoderHandler.javaJava代码 package michael.qrcode;  import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException;  import javax.imageio.ImageIO;  import jp.sourceforge.qrcode.QRCodeDecoder; import jp.sourceforge.qrcode.data.QRCodeImage; import jp.sourceforge.qrcode.exception.DecodingFailedException;  /** * @blog http://sjsky.iteye.com * @author Michael */ public class QRCodeDecoderHandler {      /**     * 解码二维码     * @param imgPath     * @return String     */     public String decoderQRCode(String imgPath) {          // QRCode 二维码图片的文件         File imageFile = new File(imgPath);          BufferedImage bufImg = null;         String decodedData = null;         try {             bufImg = ImageIO.read(imageFile);              QRCodeDecoder decoder = new QRCodeDecoder();             decodedData = new String(decoder.decode(new J2SEImage(bufImg)));              // try {             // System.out.println(new String(decodedData.getBytes("gb2312"),             // "gb2312"));             // } catch (Exception e) {             // // TODO: handle exception             // }         } catch (IOException e) {             System.out.println("Error: " + e.getMessage());             e.printStackTrace();         } catch (DecodingFailedException dfe) {             System.out.println("Error: " + dfe.getMessage());             dfe.printStackTrace();         }         return decodedData;     }      /**     * @param args the command line arguments     */     public static void main(String[] args) {         QRCodeDecoderHandler handler = new QRCodeDecoderHandler();         String imgPath = "d:/test/twocode/Michael_QRCode.png";         String decoderContent = handler.decoderQRCode(imgPath);         System.out.println("解析结果如下：");         System.out.println(decoderContent);         System.out.println("========decoder success!!!");     }      class J2SEImage implements QRCodeImage {         BufferedImage bufImg;          public J2SEImage(BufferedImage bufImg) {             this.bufImg = bufImg;         }          public int getWidth() {             return bufImg.getWidth();         }          public int getHeight() {             return bufImg.getHeight();         }          public int getPixel(int x, int y) {             return bufImg.getRGB(x, y);         }      } }

运行结果如下（解码出的内容和之前输入的内容一致）：

解析结果如下：

Hello 大大、小小,welcome to QRCode!

Myblog [ http://sjsky.iteye.com ]

EMail [ sjsky007@gmail.com ]

Twitter [ @suncto ]

========decoder success!!!

这篇文章来自“红黑联盟”，原文地址如下：

http://www.2cto.com/kf/201108/98471.html