byte数组和图片转换

package com.qdb.bfs.taobao.test;

import java.awt.image.BufferedImage;  
import java.io.ByteArrayInputStream;  
import java.io.ByteArrayOutputStream;  
import java.io.File;  
 
import javax.imageio.ImageIO;  
 
 
public class JPG {  
      
     public static  byte[] image2Bytes(String imagePath) throws Exception {  
         BufferedImage bu=ImageIO.read(new File(imagePath));  
         ByteArrayOutputStream imageStream = new ByteArrayOutputStream();  
         try {  
             boolean resultWrite = ImageIO.write(bu, "jpg", imageStream);  
         } catch (Exception e) {
             e.printStackTrace();  
         }  
         imageStream.flush();  
         byte[] tagInfo = imageStream.toByteArray();  
         return tagInfo;  
        }
         
    public static void main(String[] args) throws Exception {  
            byte[]info=image2Bytes("D:/a.jpg");  
            System.out.println(info.length);
            ByteArrayInputStream imageStream = new ByteArrayInputStream(info);  
            BufferedImage image=ImageIO.read(imageStream);  
            String newFilePath="d:/许女子.jpg";  
            ImageIO.write(image, "jpg", new File(newFilePath));       
       }
     
 
 
}