生成二维码嵌入图片中 (zxing)

h5原生. 自己写了个工具类:

package com.comtop.msp.cas.server.utils;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.comtop.msp.open.qiniu.UploadUtils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;

public class ImgUtil {
	
	private static final String TEMP = "/temp";

	public static String mergeImg(String tempPath,String requestPath,String userId) {
		String codeUrl = null;
		int width = 100;
		int height = 100;
		Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
		String mergePath = tempPath + File.separator + TEMP + "/merge.png";
		// 内容所使用编码
		hints.put(EncodeHintType.MARGIN, 0);
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		// 生成二维码
		BitMatrix bitMatrix;
		try {
			bitMatrix = new MultiFormatWriter().encode(requestPath+"/userShare/register/goRegister/"+userId, BarcodeFormat.QR_CODE, width, height, hints);
			File fileDir = new File(tempPath + TEMP);
			if (!fileDir.exists()) {
				fileDir.mkdir();
			}
			File file = new File(tempPath + File.separator + TEMP + "/qrcode.png");
			file.createNewFile();
			MatrixToImageWriter.writeToFile(bitMatrix, "PNG", file);
			
			bitMatrix.clear();
			InputStream imagein = new FileInputStream(tempPath + "/WEB-INF/classes/include/image/a.png");
			InputStream imagein2 = new FileInputStream(file);

			BufferedImage image = ImageIO.read(imagein);
			BufferedImage image2 = ImageIO.read(imagein2);

 			Graphics g = image.getGraphics();

			g.drawImage(image2, 210, 435, 100, 100, null);

			OutputStream outImage = new FileOutputStream(mergePath);
			ImageIO.write(image, "PNG", outImage);
			codeUrl = UploadUtils.upload(toByteArray2(mergePath));
			imagein.close();
			imagein2.close();
			image.flush();
			image2.flush();
			outImage.close();
			File delFile = new File(mergePath);
			delFile.delete();
			file.delete();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return codeUrl;
	}
	
	public static byte[] toByteArray2(String filename) throws IOException {  
		  
        File f = new File(filename);  
        if (!f.exists()) {  
            throw new FileNotFoundException(filename);  
        }  
  
        FileChannel channel = null;  
        FileInputStream fs = null;  
        try {  
            fs = new FileInputStream(f);  
            channel = fs.getChannel();  
            ByteBuffer byteBuffer = ByteBuffer.allocate((int) channel.size());  
            while ((channel.read(byteBuffer)) > 0) {  
                // do nothing  
                // System.out.println("reading");  
            }  
            return byteBuffer.array();  
        } catch (IOException e) {  
            e.printStackTrace();  
            throw e;  
        } finally {  
            try {  
                channel.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
            try {  
                fs.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
    }  
}