Java 生成二维码

package com.ccthanking.framework.util;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import sun.misc.BASE64Encoder;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;

/**
 * @author CaoWeiJie
 * 二维码生成
 */
public class ZxingUtil {
    
    //创建二维码
public static String createQrCode(String par){

//大小
    int width = 300;   
    int height = 300;
    //格式
    String format = "png";   
    String res ="";
     try {

     Hashtable hints= new Hashtable();   
     hints.put(EncodeHintType.CHARACTER_SET, "utf-8");   
BitMatrix bitMatrix = new MultiFormatWriter().encode(par, BarcodeFormat.QR_CODE, width, height,hints);   
bitMatrix = deleteWhite(bitMatrix);
BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);  
    ByteArrayOutputStream os = new ByteArrayOutputStream();//新建流。  
    ImageIO.write(image, format, os);//利用ImageIO类提供的write方法，将bi以png图片的数据模式写入流。  
    byte b[] = os.toByteArray();//从流中获取数据数组。  
    res = new BASE64Encoder().encode(b);  
} catch (WriterException e) {
// TODO Auto-generated catch block
System.out.println("QrCode bitMatrix操作出错");
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
System.out.println("writeToFile操作出错");
e.printStackTrace();
}
return res;  
}
/**
 * 删除二维码白边框
 * @param matrix
 * @return
 */
public static BitMatrix deleteWhite(BitMatrix matrix){  
    int[] rec = matrix.getEnclosingRectangle();  
    int resWidth = rec[2] + 1;  
    int resHeight = rec[3] + 1;  
  
    BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);  
    resMatrix.clear();  
    for (int i = 0; i < resWidth; i++) {  
        for (int j = 0; j < resHeight; j++) {  
            if (matrix.get(i + rec[0], j + rec[1]))  
                resMatrix.set(i, j);  
        }  
    }  
    return resMatrix;  
}  
}