ImageIO操作图片

package test;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.logging.Logger;

import javax.imageio.ImageIO;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class TestImageBinary {

    private static Logger logger = Logger.getLogger("TestImageBinary");
    
	static BASE64Encoder encoder = new sun.misc.BASE64Encoder();    
    static BASE64Decoder decoder = new sun.misc.BASE64Decoder();    
        
    public static void main(String[] args) {
        logger.info(getImageBinary());
        base64StringToImage(getImageBinary());    
    }    
        /**
         * 将图片转换成二进制
         * @return
         */
    public static String getImageBinary(){    
        File file = new File("C:/Users/limingwang/Desktop/test.png");           
        BufferedImage bi;    
        try {    
            bi = ImageIO.read(file);    
            ByteArrayOutputStream baos = new ByteArrayOutputStream();    
            ImageIO.write(bi, "png", baos);    
            byte[] bytes = baos.toByteArray();    
            return encoder.encodeBuffer(bytes).trim();    
        } catch (IOException e) {    
            e.printStackTrace();    
        }    
        return null;    
    }    
        
    /**
     * 将二进制转换为图片
     * @param base64String
     */
    public 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("C:/Users/limingwang/Desktop/test1.png");//可以是jpg,png,gif格式    
            logger.info("处理图片开始。。。");
            ImageIO.write(bi, "png", file);//不管输出什么格式图片，此处不需改动    
            logger.info("处理图片结束。。。");
        } catch (IOException e) {    
            e.printStackTrace();    
        }    
    }    
}