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();  }}