zxing-google二维码

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
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 ZxingUtil {
	private static final int BLACK = 0xFF000000;  
    private static final int WHITE = 0xFFFFFFFF; 
    
    /**
     * @param url 二维码content
     * @param width
     * @param height
     * @param flag
     * @return
     * @throws Exception
     */
    public static BitMatrix buildBitMatrix(String url,int width,int height,boolean flag) throws Exception {
        Hashtable hints = new Hashtable();  
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");//内容所使用编码    
        BitMatrix bitMatrix = new MultiFormatWriter().encode(url,BarcodeFormat.QR_CODE, width, height, hints);
        return flag?deleteWhite(bitMatrix):bitMatrix;
    }

    /**
     * 保存二维码图片
     * @param bitMatrix 二维码
     * @param format 保存格式
     * @param filepath 保存路径
     * @param picname 保存name
     * @throws Exception
     */
	public static void creatTwoCode(BitMatrix bitMatrix,String format,String filepath,String picname) throws Exception {
        File outputFile = new File(filepath+File.separator+picname+"."+format);//生成二维码图片
        writeToFile(bitMatrix, format, outputFile);
    } 
	
	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;  
	}
    public static BufferedImage toBufferedImage(BitMatrix matrix) { 
		int width = matrix.getWidth();  
      	int height = matrix.getHeight();  
      	BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
      	for (int x = 0; x < width; x++) {  
    	  for (int y = 0; y < height; y++) {  
        	image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);  
    	  }  
      	}  
      	return image;  
    }  
    public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {  
    	BufferedImage image = toBufferedImage(matrix);  
    	if (!ImageIO.write(image, format, file)) {  
    		throw new IOException("Could not write an image of format " + format + " to " + file);  
    	}  
    }  
    public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {  
    	BufferedImage image = toBufferedImage(matrix);  
    	if (!ImageIO.write(image, format, stream)) {  
    		throw new IOException("Could not write an image of format " + format);  
    	}  
    }

}