Javaでファイルのディレクトリを再帰的に検索する

投稿日: 2019-11-05 2019-11-05
タグ: Java, Java IO

ここでは、ディレクトリ “/Users/mkyong/websites”とそのすべてのサブディレクトリから “post.php”という名前のファイルを再帰的に検索する方法を示します。

FileSearch.java

package com.mkyong;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class FileSearch {

  private String fileNameToSearch;
  private List<String> result = new ArrayList<String>();

  public String getFileNameToSearch() {
    return fileNameToSearch;
  }

  public void setFileNameToSearch(String fileNameToSearch) {
    this.fileNameToSearch = fileNameToSearch;
  }

  public List<String> getResult() {
    return result;
  }

  public static void main(String[]args) {

    FileSearch fileSearch = new FileSearch();

       //try different directory and filename :)
    fileSearch.searchDirectory(new File("/Users/mkyong/websites"), "post.php");

    int count = fileSearch.getResult().size();
    if(count ==0){
        System.out.println("\nNo result found!");
    }else{
        System.out.println("\nFound " + count + " result!\n");
        for (String matched : fileSearch.getResult()){
        System.out.println("Found : " + matched);
        }
    }
  }

  public void searchDirectory(File directory, String fileNameToSearch) {

    setFileNameToSearch(fileNameToSearch);

    if (directory.isDirectory()) {
        search(directory);
    } else {
        System.out.println(directory.getAbsoluteFile() + " is not a directory!");
    }

  }

  private void search(File file) {

    if (file.isDirectory()) {
      System.out.println("Searching directory ... " + file.getAbsoluteFile());

           //do you have permission to read this directory?
        if (file.canRead()) {
        for (File temp : file.listFiles()) {
            if (temp.isDirectory()) {
            search(temp);
            } else {
            if (getFileNameToSearch().equals(temp.getName().toLowerCase())) {
                result.add(temp.getAbsoluteFile().toString());
            }

        }
        }

     } else {
        System.out.println(file.getAbsoluteFile() + "Permission Denied");
     }
      }

  }

}

出力

Searching directory .../Users/mkyong/websites
Searching directory .../Users/mkyong/websites/wp-admin
Searching directory .../Users/mkyong/websites/wp-admin/css
Searching directory .../Users/mkyong/websites/wp-admin/images
Searching directory .../Users/mkyong/websites/wp-admin/images/screenshots
Searching directory .../Users/mkyong/websites/wp-admin/includes
Searching directory .../Users/mkyong/websites/wp-admin/js
Searching directory .../Users/mkyong/websites/wp-admin/maint
Searching directory .../Users/mkyong/websites/wp-admin/network
Searching directory .../Users/mkyong/websites/wp-admin/user
Searching directory .../Users/mkyong/websites/wp-content
Searching directory .../Users/mkyong/websites/wp-content/plugins//long list, omitted.

Found 3 result!

Found :/Users/mkyong/websites/wp-admin/includes/post.php
Found :/Users/mkyong/websites/wp-admin/post.php
Found :/Users/mkyong/websites/wp-includes/post.php

リンク://タグ/java/[java]

java.io

getdocs

13036