使用base64对图片的加密解密

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();      
        }      
    }      
     
}