java实现递归文件列表的方法

本文实例讲述了java实现递归文件列表的方法。分享给大家供大家参考。具体如下：

FileListing.java如下：

import java.util.*;
import java.io.*;

public final class FileListing {
 
 public static void main(String... aArgs) throws FileNotFoundException {
  File startingDirectory= new File(aArgs[0]);
  List files = FileListing.getFileListing(startingDirectory);
  //print out all file names, in the the order of File.compareTo()
  for(File file : files ){
   System.out.println(file);
  }
 }
 
 static public List getFileListing(
  File aStartingDir
 ) throws FileNotFoundException {
  validateDirectory(aStartingDir);
  List result = getFileListingNoSort(aStartingDir);
  Collections.sort(result);
  return result;
 }
 // PRIVATE //
 static private List getFileListingNoSort(
  File aStartingDir
 ) throws FileNotFoundException {
  List result = new ArrayList();
  File[] filesAndDirs = aStartingDir.listFiles();
  List filesDirs = Arrays.asList(filesAndDirs);
  for(File file : filesDirs) {
   result.add(file); //always add, even if directory
   if ( ! file.isFile() ) {
    //must be a directory
    //recursive call!
    List deeperList = getFileListingNoSort(file);
    result.addAll(deeperList);
   }
  }
  return result;
 }
 
 static private void validateDirectory (
  File aDirectory
 ) throws FileNotFoundException {
  if (aDirectory == null) {
   throw new IllegalArgumentException("Directory should not be null.");
  }
  if (!aDirectory.exists()) {
   throw new FileNotFoundException("Directory does not exist: " + aDirectory);
  }
  if (!aDirectory.isDirectory()) {
   throw new IllegalArgumentException("Is not a directory: " + aDirectory);
  }
  if (!aDirectory.canRead()) {
   throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
  }
 }
}

希望本文所述对大家的java程序设计有所帮助。