编写程序，将指定目录下所有.java 文件拷贝到另一个目的中，并将扩展名改为.txt。

Posted 2022-12-12 暴走灬青春

package com.heima.test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Scanner;

import javax.imageio.stream.FileImageInputStream;

public class Test02 

    /**编写程序，将指定目录下所有.java 文件拷贝到另一个目的中，并将扩展名改为.txt。
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException 
        File src = getDir();
        File dest = getDir();
        copy(src,dest);
        reName(dest);
    

    public static void reName(File dest) 
        File [] subFiles = dest.listFiles();
        for (File subFile : subFiles) 
            if(subFile.isFile())
                if(subFile.getName().endsWith(".java"))
                    System.out.println(subFile.getPath().replaceAll("\\\\.java", ".txt"));
                    File newName = new File(subFile.getPath().replaceAll("\\\\.java", ".txt"));
                    subFile.renameTo(newName);
                
            else
                reName(subFile);
            
        
    

    public static void copy(File src, File dest) throws IOException 
        File newDir = new File(dest,src.getName());
        newDir.mkdir();
        File []subFiles = src.listFiles();
        for (File subFile : subFiles) 
            if(subFile.isFile())
                BufferedInputStream bis = new BufferedInputStream(new FileInputStream(subFile));
                BufferedOutputStream bos = 
                        new BufferedOutputStream(new FileOutputStream(new File(newDir,subFile.getName())));     
                int len;
                while((len = bis.read()) != -1)
                    bos.write(len);
                
                bis.close();
                bos.close();
            else
                copy(subFile, newDir);
            

        
    

    public static File getDir() 
        Scanner sc = new Scanner(System.in);
        System.out.println("输入文件夹路径：");
        while(true)
            String line = sc.nextLine();
            File dir = new File(line);
            if(!dir.exists())
                System.out.println("文件夹路径不存在！重输：");
            else if(dir.isFile())
                System.out.println("不是文件夹，是文件！重输：");
            else
                return dir;