字节流复制文本文件

package com.czie.iot1913.lps.IO.InPutStream;

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

/**
 * FileName: FileCopyTest01
 * Author:   lps
 * Date:     2022/3/23 21:42
 * Sign:刘品水 Q：1944900433
 */
public class FileCopyTest01 {
    public static void main(String[] args) throws IOException {
        //在本目录创建txt文件
        File file01 = new File("F:\\JavaCode\\窗里窗外.txt");

        //读取E盘下txt内容
        FileInputStream fis = new FileInputStream("E:\\itcast\\窗里窗外.txt");
        FileOutputStream fos = new FileOutputStream("F:\\JavaCode\\窗里窗外.txt");
        int by;
        while ((by=fis.read())!=-1){
            fos.write(by);
        }
        fos.close();
        fis.close();


    }
}

 

 

 

 

package com.czie.iot1913.lps.IO.InPutStream;

import java.io.FileInputStream;
import java.io.IOException;

/**
 * FileName: FileInPutStreamTEst02
 * Author:   lps
 * Date:     2022/3/23 23:05
 * Sign:刘品水 Q：1944900433
 */
public class FileInPutStreamTest02 {
    public static void main(String[] args) throws IOException {
        //创建字节输入流对象
        FileInputStream fis = new FileInputStream("F:\\JavaCode\\fos.txt");
        /*//调用字节输入流对象的读取数据
        //int read(byte[] b)
        //读到 b.length从输入流到字节数组数据字节。
        byte[] bys = new byte[5];
        int len = fis.read(bys);
        System.out.println(len);
        //System.out.println(new String(bys));
        System.out.println(new String(bys,0,len));
        //有\r\n！！！！
        len = fis.read(bys);
        System.out.println(len);
        //System.out.println(new String(bys));
        System.out.println(new String(bys,0,len));

//int read(byte[] b, int off, int len)
//读到 len从输入流到字节数组数据字节。
        len = fis.read(bys);
        System.out.println(len);
        System.out.println(new String(bys,0,len));
        */
        byte[] bys = new byte[1024];//1024及其整数倍
        int len ;
        while ((len=fis.read(bys))!=-1){
            System.out.println(new String(bys,0,len));
        }


        //释放内存
        fis.close();

    }
}