2021-08-19利用Java编写的一个简单的文件复制器-优快云博客

本文链接：https://blog.youkuaiyun.com/chenfanc/article/details/119807669

这是一个Java程序，实现了从用户输入的源文件路径复制到目标文件路径的功能。如果目标文件已存在，程序会提供两种不同的复制方法。程序首先验证源文件是否存在，然后根据情况调用相应的方法进行文件复制，并在复制完成后更新目标文件的最后修改时间。

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package com.cast.io;

import java.io.*;
import java.time.LocalDateTime;
import java.util.Scanner;

/**
 * @author Administrator
 * @version 1.0
 * @description: 简单的文件复制器(EasyFileCopy)
 * @date 2021/8/19 16:16
 */

public class EasyCopy {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Please write sourceFileName and path,such as C:\\xxx.txt");
        String sourceFileName = scanner.nextLine();
        System.out.println("Please write targetFileName and path,such as C:\\xxx.txt");
        String targetFileName = scanner.nextLine();
        //Close scanner
        scanner.close();
        File file = new File(sourceFileName);
        File file2 = new File(targetFileName);
        if (file.exists() && file2.exists()) {
            copyStart(sourceFileName, targetFileName);
            System.out.println("Start Method one");
        } else if (file.exists() && file2.exists() == false) {
            copyStart2(sourceFileName, targetFileName);
            System.out.println("start Method 2");
        } else {
            System.out.println("没有源文件");
        }

    }

    public static void copyStart2(String sourceSrc, String targetSrc) {

        FileOutputStream fos = null;
        FileInputStream fis = null;
        try {
            new File(targetSrc).createNewFile();
        } catch (IOException e) {
            System.out.println("已经有了");
        }
        try {
            //Source File's path,use FileInputStream,read file in Rom
            fis = new FileInputStream(sourceSrc);

            //TagerFile's path,use FileOutputStream,write file in Ram
            fos = new FileOutputStream(targetSrc);

            byte[] bytes = new byte[500];
            int num = 0;
            while ((num = fis.read(bytes)) != -1) {
                fos.write(bytes, 0, num);
            }
            //打印最后的修改时间
            fos.write(("\r\nlastChangeTime" + LocalDateTime.now()).getBytes());

        } catch (FileNotFoundException e) {
            System.out.println("没能找到这个文件");
        } catch (IOException e) {
            System.out.println("读写报错");
        } finally {

            try {
                fis.close();
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void copyStart(String sourceSrc, String targetSrc) {

        FileOutputStream fos = null;
        FileInputStream fis = null;
        try {
            //Source File's path,use FileInputStream,read file in Rom
            fis = new FileInputStream(sourceSrc);

            //TagerFile's path,use FileOutputStream,write file in Ram
            fos = new FileOutputStream(targetSrc);

            byte[] bytes = new byte[500];
            int num = 0;
            while ((num = fis.read(bytes)) != -1) {
                fos.write(bytes, 0, num);
            }
            //打印最后的修改时间
            fos.write(("\r\nlastChangeTime" + LocalDateTime.now()).getBytes());

        } catch (FileNotFoundException e) {
            System.out.println("没能找到这个文件");
        } catch (IOException e) {
            System.out.println("读写报错");
        } finally {

            try {
                fis.close();
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}