java-二维码编写zxing

package com.utils;

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

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

public class UtilsQrCode {

private static final int BLACK = 0xff000000;
private static final int WHITE = 0xFFFFFFFF;

/**
* @param args
*/
public static void main(String[] args) {
File file = new File("C:\\Users\\huage\\Desktop\\图片\\"+new Date().getTime()+".png");
encode("http://www.baidu.com", file, BarcodeFormat.QR_CODE, 200, 200);
}

/**
* @param contents
* @param file
* @param format
* @param width
* @param height
*/
public static  void encode(String contents, File file, BarcodeFormat format, int width, int height) {
try {
contents = new String(contents.getBytes("UTF-8"), "ISO-8859-1");
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, format, width, height,hints);
BufferedImage image = toBufferedImage(bitMatrix);
writeToFile(image, "png", file);
} catch (Exception e) {
e.printStackTrace();
}
}

public static byte[] imgToBytes(BufferedImage image){
if( image == null ) return new byte[0];
byte[] data = ((DataBufferByte) image.getData().getDataBuffer()).getData();
return data;
}

public static void writeToFile(BufferedImage image, String format, File file) throws IOException {
if( image == null || file == null ) return;
ImageIO.write(image, format, file);
}

public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
}
}
return image;
}

}