列表中的文件夾中的所有文件，並分文件夾

Question

可能重複：
List all files from a directory recursively with Java

我怎樣才能返回一個文件數組包含的文件夾中的所有文件，並分文件夾我的方法只適用於文件夾，它不包含子文件夾。

public File[] listf(String directoryName) { 

    // .............list file 
    File directory = new File(directoryName); 

    // get all the files from a directory 
    File[] fList = directory.listFiles(); 

    for (File file : fList) { 
     if (file.isFile()) { 
      System.out.println(file.getAbsolutePath()); 
     } else if (file.isDirectory()) { 
      listf(file.getAbsolutePath()); 
     } 
    } 
    System.out.println(fList); 
    return fList; 
}       

Answer 1

使用你當前的代碼，使這個調整：

public void listf(String directoryName, ArrayList<File> files) { 
    File directory = new File(directoryName); 

    // get all the files from a directory 
    File[] fList = directory.listFiles(); 
    for (File file : fList) { 
     if (file.isFile()) { 
      files.add(file); 
     } else if (file.isDirectory()) { 
      listf(file.getAbsolutePath(), files); 
     } 
    } 
} 

Answer 2

使用來自Apache commons的FileUtils。

listFiles 

public static Collection<File> listFiles(File directory, 
             String[] extensions, 
             boolean recursive) 
Finds files within a given directory (and optionally its subdirectories) which match an array of extensions. 
Parameters: 
directory - the directory to search in 
extensions - an array of extensions, ex. {"java","xml"}. If this parameter is null, all files are returned. 
recursive - if true all subdirectories are searched as well 
Returns: 
an collection of java.io.File with the matching files 

Answer 3

您可以返回List而不是數組，事情變得簡單多了。

public static List<File> listf(String directoryName) { 
     File directory = new File(directoryName); 

     List<File> resultList = new ArrayList<File>(); 

     // get all the files from a directory 
     File[] fList = directory.listFiles(); 
     resultList.addAll(Arrays.asList(fList)); 
     for (File file : fList) { 
      if (file.isFile()) { 
       System.out.println(file.getAbsolutePath()); 
      } else if (file.isDirectory()) { 
       resultList.addAll(listf(file.getAbsolutePath())); 
      } 
     } 
     //System.out.println(fList); 
     return resultList; 
    }