Java 将图片转二进制再将二进制转成图片

转载：http://www.cnblogs.com/gengaixue/p/5035908.html

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 TestImageBinary {
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());
}

static String getImageBinary(){
File f = new File("c://20090709442.jpg");
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[] bytes1 = decoder.decodeBuffer(base64String);

ByteArrayInputStream bais = new ByteArrayInputStream(bytes1);
BufferedImage bi1 =ImageIO.read(bais);
File w2 = new File("c://QQ.bmp");//可以是jpg,png,gif格式
ImageIO.write(bi1, "jpg", w2);//不管输出什么格式图片，此处不需改动
} catch (IOException e) {
e.printStackTrace();
}
}

}