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jar包：qrcode.jar，Qrcode_swetake.jar

下载地址: http://download.csdn.net/detail/heyeweiwan/8707117

1生成二维码:

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.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 = "c:/Michael_QRCode.png"; 
 
        String content = "爸爸妈妈告诉我"; 
 
        QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); 
        handler.encoderQRCode(content, imgPath); 
 
        System.out.println("encoder QRcode success"); 
    } 
	
}

2: 解密二维码

public static void main(String[] args) throws IOException {
//		if (args.length < 1) {
//			System.err.println("Usage: QRCodeDecoderCUIExample imageFilePath");
//			System.exit(1);
//    }
     QRCodeDecoder decoder = new QRCodeDecoder();
     BufferedImage image  = ImageIO.read(new File("c:/Michael_QRCode.png"));
     String decodedString = new String(decoder.decode(new J2SEImage(image)));
	 decodedString = ContentConverter.convert(decodedString);
	 System.out.println(decodedString);
	}

3.J2SEImage 类

class J2SEImage implements QRCodeImage {
    BufferedImage image;
 
    public J2SEImage(BufferedImage image) {
        this.image = image;
    }
 
    public int getWidth() {
        return image.getWidth();
    }
 
    public int getHeight() {
        return image.getHeight();
    }
 
    public int getPixel(int x, int y) {
        return image.getRGB(x, y);
    }
}