二維碼的生成和解碼Java實現

涉及到的一些主要類庫，方便大家下載：

• 二維碼編碼lib:Qrcode_swetake.jar（官網介紹 -- http://www.swetake.com/qr/index-e.html）
  
• 二維碼解碼lib:qrcode.jar （官網介紹 -- http://sourceforge.jp/projects/qrcode/）

java二維碼 生成二維碼 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;
/**

二維碼生成器
@blog http://zhblog.github.com/blog
@author zzh
*/
public class QRCodeEncoderHandler {
/**

生成二維碼(QRCode)圖片
@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);

 // 設定圖像顏色 > BLACK
 gs.setColor(Color.BLACK);

 // 設置偏移量 不設置可能導致解析出錯
 int pixoff = 2;
 // 輸出內容 > 二維碼
 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);

 // 生成二維碼QRCode圖片
 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   :jack.zh.1986@gmail.com"
     + "\nQQ      :715443050";


QRCodeEncoderHandler handler = new QRCodeEncoderHandler();
 handler.encoderQRCode(content, imgPath);
 System.out.println("encoder QRcode success");
}
}</pre> 

 
 java二維碼解碼 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 {
/**

解碼二維碼
@param imgPath
@return String
*/
public String decoderQRCode(String imgPath) {
// QRCode 二維碼圖片的文件
 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("解析結果如下：");
 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);

}
}
}</pre>