Java 将图片转二进制再将二进制转成图片

import java.awt.image.BufferedImage;    
import java.io.ByteArrayInputStream;    
import java.io.ByteArrayOutputStream;    
import java.io.File;    
import java.io.IOException;    
   
import javax.imageio.ImageIO;    
   
import sun.misc.BASE64Decoder;    
import sun.misc.BASE64Encoder;    
   
public class TestImageBinary {    
    static BASE64Encoder encoder = new sun.misc.BASE64Encoder();    
    static BASE64Decoder decoder = new sun.misc.BASE64Decoder();    
        
    public static void main(String[] args) {    
        System.out.println(getImageBinary());    
            
        base64StringToImage(getImageBinary());    
    }    
        
    static String getImageBinary(){    
        File f = new File("c://20090709442.jpg");           
        BufferedImage bi;    
        try {    
            bi = ImageIO.read(f);    
            ByteArrayOutputStream baos = new ByteArrayOutputStream();    
            ImageIO.write(bi, "jpg", baos);    
            byte[] bytes = baos.toByteArray();    
                
            return encoder.encodeBuffer(bytes).trim();    
        } catch (IOException e) {    
            e.printStackTrace();    
        }    
        return null;    
    }    
        
    static void base64StringToImage(String base64String){    
        try {    
            byte[] bytes1 = decoder.decodeBuffer(base64String);    
                
            ByteArrayInputStream bais = new ByteArrayInputStream(bytes1);    
            BufferedImage bi1 =ImageIO.read(bais);    
            File w2 = new File("c://QQ.bmp");//可以是jpg,png,gif格式    
            ImageIO.write(bi1, "jpg", w2);//不管输出什么格式图片，此处不需改动    
        } catch (IOException e) {    
            e.printStackTrace();    
        }    
    }    
   
}