java 生成QR二维码 解析二维码 以及完整实例

package com.qrcode;

import java.awt.Color;
import java.awt.Graphics2D;
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;

import com.swetake.util.Qrcode;

public class QRCode {

/**
* 生成二维码(QRCode)图片
* @param content
* @param imgPath
*/
public static void Encode(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 = "F:/log/Michael_QRCode.png";
String content = "中化人民共和国";
Encode(content, imgPath);
System.out.println("encoder QRcode success");
String res=Decode(imgPath);
System.out.println(res);
}

/**
* 解码二维码
*
* @param imgPath
* @return String
*/
public static String Decode(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 MyImage(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;
}
}

class MyImage implements QRCodeImage {
BufferedImage bufImg;

public MyImage(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);
}

}