Java实现快速生成与解码二维码

package com;
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;

public class QRCodeEncoderTest {
public QRCodeEncoderTest() throws Exception{
Qrcode qrcode = new Qrcode();
qrcode.setQrcodeErrorCorrect('M');
qrcode.setQrcodeEncodeMode('B');
qrcode.setQrcodeVersion(7);
String encodeddata = "{id:10022111,name:wandern}";
byte[] d = encodeddata.getBytes("GBK");
BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB);
// createGraphics
Graphics2D g = bi.createGraphics();
// set background
g.setBackground(Color.WHITE);
g.clearRect(0, 0, 139, 139);
g.setColor(Color.BLACK);

if (d.length > 0 && d.length < 123) {
boolean[][] b = qrcode.calQrcode(d);
for (int i = 0; i < b.length; i++) {
for (int j = 0; j < b.length; j++) {