java递归实现复制一个文件夹下所有文件功能

package io.github.liuzhan214;
import java.io.File;
import java.io.IOException;

public class Main {

  void solve() {
    File file = new File("F:\\javaIOTest\\new.txt");
    if(!file.exists()) {
      try {
        file.createNewFile();
      } 
      catch(IOException e) {
        e.printStackTrace();
      }
    }
    else {
      System.out.println(file.getName());
    }
    File dir = new File("F:\\javaIOTest");
    System.out.println(dir.getName());
    if(dir.isDirectory()) {
      String[] filename = dir.list();
      for(String str: filename) {
        File tempFile = new File(dir.getPath() + File.separator + str);
        if(tempFile.isFile()) {
          System.out.println("File: " + tempFile.getPath());
        }
        else if(tempFile.isDirectory()) {
          System.out.println("Dir: " + tempFile.getPath());
        }
      }
    }
  }
  public static void main(String[] args) {
    Main main = new Main();
    main.solve();
  }
}

package io.github.liuzhan214;

import java.util.Scanner;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Main {

  Scanner scanner = new Scanner(System.in);

  void solve() {
    String inputString = scanner.next();
    String outputString = scanner.next();
    File inputFile = new File(inputString);
    File outputFile = new File(outputString);
    if(inputFile.exists() == false || outputFile.exists() == false) {
      System.out.println("输入或者输出路径不合法!"); return;
    }
    File sourceFile = inputFile;
    File destFile = new File(outputFile.getPath() + File.separator + inputFile.getName());
    try {
      myCopy(sourceFile,destFile);
    } catch(Exception e) {
      System.out.println("复制出现错误!"); return;
    }
    System.out.println(sourceFile.getPath() + "->" + destFile.getPath() + "复制成功!"); 
  }

  void myCopy(File sourceFile,File destFile) throws Exception{
    //保证sourceFile一定存在，destFile一定不存在,因此先创建destFile
    if(sourceFile.isFile()) destFile.createNewFile();
    else if(sourceFile.isDirectory()) destFile.mkdir();

    if(sourceFile.isFile()) copy(sourceFile,destFile);
    else if(sourceFile.isDirectory()) {
      File[] files = sourceFile.listFiles();
      for(File ele : files) {
        File newDestFile = new File(destFile.getPath() + File.separator + ele.getName());
        myCopy(ele,newDestFile);
      }
    }
  }
  void copy(File sourceFile,File destFile) throws Exception{
    //保证sourceFile一定存在，destFile一定存在
    FileInputStream inputStream = new FileInputStream(sourceFile);
    FileOutputStream outputStream = new FileOutputStream(destFile);
    byte[] arr = new byte[256];
    int len = 0;
    while((len = inputStream.read(arr)) > 0) {
      outputStream.write(arr, 0, len);
    }
    inputStream.close();
    outputStream.close();
  }

  void close() {
    scanner.close();
  }
  public static void main(String[] args) {
    Main main = new Main();
    main.solve();
    main.close();
  }
}