运用简单的IO流对图片进行加密。。。。。

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Demo01 {

public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
//加密图片
String file1 = "C:/Users/guoyongfeng/Desktop/test/3.jpg";
String file2 = "C:/Users/guoyongfeng/Desktop/test/4.jpg";//3是加密的图片

//读取2.jpg的图片数据，然后写到3.jpg
FileInputStream fis = new FileInputStream(file1);
FileOutputStream fos = new FileOutputStream(file2);

//一个字节一个字节写
int b = 0;
while( (b = fis.read()) != -1){
//一个数异或2次，值不变
fos.write(b ^ 5);
}

//关闭流
fis.close();
fos.close();

}

}