[java,2019-01-25] 图片和二进制互转

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();
        }
    }  

}