使用java将a.txt和b.txt中的内容进行替换

package com.haimeng.test;

import java.io.*;
//将a.txt好b.txt文件中的内容进行替换
public class demo_io2 {
    public static void main(String[] args) throws IOException {
//3、创建一个字节数组，负责转移字节数据
        byte[] buffer = new byte[1024]; //1KB
//1024 1024 6 相当于一桶水一桶水的倒 在同一次流的使用中，不会覆盖原内容
//4、从字节输入流中读取字节数据，写出去到字节输出流中，读多少写多少
        int len;//记住每次读取多少字节

        InputStream isa = new FileInputStream("src/com/haimeng/upload/a.txt");
        OutputStream osc = new FileOutputStream("src/com/haimeng/upload/c.txt");
        while ((len = isa.read(buffer)) != -1){
            osc.write(buffer,0,len);
        }
        osc.close();
        isa.close();

        InputStream isb = new FileInputStream("src/com/haimeng/upload/b.txt");
        OutputStream osa = new FileOutputStream("src/com/haimeng/upload/a.txt");
        while ((len = isb.read(buffer)) != -1){
            osa.write(buffer,0,len);
        }
        osa.close();
        isb.close();

        InputStream isc = new FileInputStream("src/com/haimeng/upload/c.txt");
        OutputStream osb = new FileOutputStream("src/com/haimeng/upload/b.txt");
        while ((len = isc.read(buffer)) != -1){
            osb.write(buffer,0,len);
        }

        isc.close();
        osb.close();

        System.out.println("替换成功");
    }
}