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;

@SuppressWarnings("restriction")

public class ImageTest {

    static BASE64Encoder encoder = new BASE64Encoder();

    static BASE64Decoder decoder = new BASE64Decoder();   

    public static void main(String[] args) {

        String img_str=image2Binary();

        System.out.println(img_str);

        base64StringToImage(img_str);

    }   

    static String image2Binary(){

        File f = new File("e:/a.gif");

        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[] bytes = decoder.decodeBuffer(base64String);   

            ByteArrayInputStream bais = new ByteArrayInputStream(bytes);

            BufferedImage bi =ImageIO.read(bais);

            File file = new File("e:/a.png");

            ImageIO.write(bi, "jpg", file);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }  

}