java遍历文件夹的两种办法：

A. 不使用递归

import java.io.File;
import java.util.LinkedList;
public class FileSystem {public static void main(String[] args) {long a = System.currentTimeMillis();LinkedList list = new LinkedList();File dir = new File("c:\\java\\");File file[] = dir.listFiles();for (int i = 0; i < file.length; i++) {if (file[i].isDirectory())list.add(file[i]);elseSystem.out.println(file[i].getAbsolutePath());}File tmp;while (!list.isEmpty()) {tmp = list.removeFirst();if (tmp.isDirectory()) {file = tmp.listFiles();if (file == null)continue;for (int i = 0; i < file.length; i++) {if (file[i].isDirectory())list.add(file[i]);elseSystem.out.println(file[i].getAbsolutePath());}} else {System.out.println(tmp.getAbsolutePath());}}System.out.println(System.currentTimeMillis() - a);}
}

B. 使用递归

import java.io.File;
import java.util.ArrayList;
public class FileSystem1 {private static ArrayList filelist = new ArrayList(); public static void main(String[] args) {long a = System.currentTimeMillis();refreshFileList("c:\\java");System.out.println(System.currentTimeMillis() - a);}public static void refreshFileList(String strPath) { File dir = new File(strPath); File[] files = dir.listFiles(); if (files == null) return; for (int i = 0; i < files.length; i++) { if (files[i].isDirectory()) { refreshFileList(files[i].getAbsolutePath()); } else { String strFileName = files[i].getAbsolutePath().toLowerCase();System.out.println("---"+strFileName);filelist.add(files[i].getAbsolutePath());                    } } }
}

结论：经过测试，使用递归的方法B性能相对好一些。