java循环遍历文件夹及其子文件夹和文件

今天一个同事要做这个东西，让我帮忙，呵呵，一个简单的递归，仅附代码：

 package com.file;

import java.io.*;

public class FileDirectory {

public static void isDirectory(File file) {

   

if(file.exists()){

if (file.isFile()) {

System.out.println("file is ==>>" + file.getAbsolutePath());

} else {

File[] list = file.listFiles();

if (list.length == 0) {

System.out.println(file.getAbsolutePath() + " is null");

} else {

for (int i = 0; i < list.length; i++) {

isDirectory(list[i]);

}

}

}

}else{

System.out.println("The directory is not exist!");

}

}

public static void main(String[] args) {

isDirectory(new File("D://WTP//PHPDemo"));// path can be changed

}

}