Java 示例 - 搜索文件

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  问题描述

  如何搜索目录中的所有文件？
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  解决方案

  下面的示例演示了如何使用 File 类的 dir.list() 方法搜索并获取指定目录下所有文件的列表。

  
  import java.io.File;
  public class Main {
     public static void main(String[] argv) throws Exception {
        File dir = new File("directoryName");
        String[] children = dir.list();
        
        if (children == null) {
           System.out.println("does not exist or 
           is not a directory");
        } else {
           for (int i = 0; i < children.length; i++) {
              String filename = children[i];
              System.out.println(filename);
           }
        }
     }
  }
  

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  结果

  上面的代码示例将产生以下结果。

  
  sdk
  ---vehicles
  ------body.txt
  ------color.txt
  ------engine.txt
  ---ships
  ------shipengine.txt
  

  以下是在 Java 中搜索目录中所有文件的另一个示例示例

  
  import java.io.File;
  import java.io.IOException;
  import java.util.Scanner;
  public class Main { 
     public static void main(String[] args) throws IOException {
        System.out.println("Enter the path to folder to search for files");
        Scanner s1 = new Scanner(System.in);
        String folderPath = s1.next();
        File folder = new File(folderPath);
        
        if (folder.isDirectory()) {
           File[] listOfFiles = folder.listFiles();
           if (listOfFiles.length < 1)System.out.println(
              "There is no File inside Folder");
           else System.out.println("List of Files & Folder");
           for (File file : listOfFiles) {
              if(!file.isDirectory())System.out.println(
                 file.getCanonicalPath().toString());
           } 
        } 
        else System.out .println("There is no Folder @ given path :" + folderPath);
     }
  }
  

  上面的代码示例将产生以下结果。

  
  Enter the path to folder to search for files
  C:/
  List of Files & Folder
  C:\bootmgr
  C:\BOOTNXT
  C:\hiberfil.sys
  C:\pagefile.sys
  C:\recovery.img.img
  C:\swapfile.sys