二维码的生成和解码Java实现详解编程语言

涉及到的一些主要类库，方便大家下载：

• 二维码编码lib:Qrcode_swetake.jar（官网介绍 — http://www.swetake.com/qr/index-e.html）
• 二维码解码lib:qrcode.jar （官网介绍 — http://sourceforge.jp/projects/qrcode/）

java二维码 生成二维码 QRCodeEncoderHandler.java

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://zhblog.github.com/blog 
 * @author zzh 
 */ 
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("utf-8"); 
 
            BufferedImage bufImg = new BufferedImage(140, 140, 
                    BufferedImage.TYPE_INT_RGB); 
 
            Graphics2D gs = bufImg.createGraphics(); 
 
            gs.setBackground(Color.cyan); 
            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 = "./zzh.png"; 
 
        String content = "/t江湖在喝酒的路上" 
                + "/nMyblog  :http://zhblog.github.com/blog" 
                + "/nEMail   :[email protected]" 
                + "/nQQ      :715443050"; 
 
        QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); 
        handler.encoderQRCode(content, imgPath); 
        System.out.println("encoder QRcode success"); 
    } 
}

java二维码解码 QRCodeDecoderHandler.java

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://zhblog.github.com/blog 
 * @author zzh 
 */ 
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))); 
        } 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 = "zzh.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); 
        } 
 
    } 
}