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();
 }
}