QR二维验证码的生成及识别

package com.test;

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 static void main(String[] args) throws Exception{
  QRCodeEncode("TestQRCode.jpg","jpg","测试数据，字符长度不能超过123");
 }
 public static void QRCodeEncode(String filename,String filetype,String input)throws Exception
 {
  Qrcode qrcode = new Qrcode();
  qrcode.setQrcodeErrorCorrect('M');
  qrcode.setQrcodeEncodeMode('B');
  qrcode.setQrcodeVersion(7);

  String testString = input;

  byte[] d = testString.getBytes("GBK");

  BufferedImage bi = new BufferedImage(556, 556,
    BufferedImage.TYPE_INT_RGB);

  // createGraphics   
  Graphics2D g = bi.createGraphics();

  // set background   
  g.setBackground(Color.WHITE);
  g.clearRect(0, 0, 556, 556);

  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++) {
     if (b[j][i]) {
      g.fillRect(j * 12 + 2, i * 12 + 2, 12, 12);
     }
    }

   }
  }

  g.dispose();
  bi.flush();

  String FilePath = filename;
  File f = new File(FilePath);

  ImageIO.write(bi,filetype, f);
  System.out.println("QRCodeEncodeSuccess!");
 }

}

package com.test;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

public class QRCodeDecoderTest {
 public static void main(String[] args) {
  String test=QRCodeDecode("2.jpg");
  System.out.println(test);
 }
 public static String QRCodeDecode(String filename)
 {
  QRCodeDecoder decoder = new QRCodeDecoder();

  File imageFile = new File(filename);

  BufferedImage image = null;

  try {
   image = ImageIO.read(imageFile);
  } catch (IOException e) {
   System.out.println("读取文件失败:" + e.getMessage());
  }
  try {

   String decodedData = new String(decoder
     .decode(new J2SEImage(image)), "GBK");

   return decodedData;
  } catch (DecodingFailedException dfe) {
   System.out.println("解析失败: " + dfe.getMessage());
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  }
  return "";

 }
}

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);
 }

}

用到QRCode.jar包