java 生成和解密二维码

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");
}
}

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);
}
}

最后

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