[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();   
        }   
    }  
    
}