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 A {
	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());
	}

	/**
	 * 將圖片轉換成二進位制
	 * 
	 * @return
	 */
	static String getImageBinary() {
		File f = new File("e:/1.jpg");
		BufferedImage bi;
		try {
			bi = ImageIO.read(f);
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ImageIO.write(bi, "jpg", baos);  //經測試轉換的圖片是格式這裡就什麼格式，否則會失真
			byte[] bytes = baos.toByteArray();

			return encoder.encodeBuffer(bytes).trim();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 將二進位制轉換為圖片
	 * 
	 * @param base64String
	 */
	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("e://QQ.jpg");// 可以是jpg,png,gif格式
			ImageIO.write(bi1, "jpg", w2);// 不管輸出什麼格式圖片，此處不需改動
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}