[Java] 纯文本查看 复制代码

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

public class Demo1_BufferedInputStream {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream("E:\\1.jpg"));
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("E:\\crypt.jpg"));
		
		encrypt(bis,bos);
	}

	private static void encrypt(BufferedInputStream bis, BufferedOutputStream bos) throws IOException {
		//加密文件
		int b;
		while ((b = bis.read()) != -1) {
[b]			bos.write(b ^ 256);[/b]
		}
		bis.close();
		bos.close();
	}

}

一个文件异或256(bos.write(b ^ 256);)文件没有被加密,这是怎么回事呢?

^512  ^1024  也一样,原文件不变