Java中遍曆檔案

 

　　

使用遞迴方法實現

 1 import java.io.File; 2 import java.util.ArrayList; 3 public class FileSystem1 { 4     private static ArrayList<String> filelist = new ArrayList<String>();  5      6     public static void main(String[] args) { 7          8         long a = System.currentTimeMillis(); 9         refreshFileList("c:"+File.separator);
10         System.out.println(System.currentTimeMillis() - a);11     }12     public static void refreshFileList(String strPath) { 13         File dir = new File(strPath); 14         File[] files = dir.listFiles(); 15         16         if (files == null) 17             return; 18         for (int i = 0; i < files.length; i++) { 19             if (files[i].isDirectory()) { 20                 refreshFileList(files[i].getAbsolutePath()); 21             } else { 22                 String strFileName = files[i].getAbsolutePath().toLowerCase();23                 System.out.println("---"+strFileName);24                 filelist.add(files[i].getAbsolutePath());                    25             } 26         } 27     }28 }

 

使用非遞迴方法實現

 1 import java.io.File; 2 import java.util.LinkedList; 3 public class FileSystem { 4     public static void main(String[] args) { 5          6         long a = System.currentTimeMillis(); 7          8         LinkedList<File> list = new LinkedList<File>(); 9         //擷取系統硬碟符10         File[] files = File.listRoots();11 12        for(int j=0;j<files.length;j++)13      {14          File file[] = files[j].listFiles();15         for (int i = 0; i < file.length; i++) {16             if (file[i].isDirectory())17                 list.add(file[i]);18             else19                 System.out.println(file[i].getAbsolutePath());20         }21         File tmp;22         while (!list.isEmpty()) {23             tmp = list.removeFirst();24             if (tmp.isDirectory()) {25                 file = tmp.listFiles();26                 if (file == null)27                     continue;28                 for (int i = 0; i < file.length; i++) {29                     if (file[i].isDirectory())30                         list.add(file[i]);31                     else32                         System.out.println(file[i].getAbsolutePath());33                 }34             } else {35                 System.out.println(tmp.getAbsolutePath());36             }37         }38     }    39         System.out.println(System.currentTimeMillis() - a);40     }41 }