目录的递归遍历

内容: package io9;import java.io.*;import java.util.ArrayList;import java.util.Arrays;import lang9.Str9;import lang9.out;//以上引入的lang9中的类很简单，读者可自行编写public class File9 { //list specified files int dir,include all the specified files in subdirectory.// public static File[] listFiles(FileFilter9 filter, File dir) {//listFilenames public static String[] listFilenames(String dir) { File[] ff = listFiles(new File(dir)); String[] ss = new String[ff.length]; for (int i = 0; i < ff.length; i++) { ss[i] = ff[i].getAbsolutePath(); } return ss; }//listfiles() public static File[] listFiles() { File dir = new File(System.getProperty('user.dir')); return listFiles(dir); }//listdirs() public static File[] listDirs() { File dir = new File(System.getProperty('user.dir')); return listDirs(dir); }//listfiles(dir) public static File[] listFiles(File dir) { if (!dir.exists() || !dir.isDirectory()) { System.out.println('wrong File 23'); return null; } FileFilter9 filter = new FileFilter9(FileFilter9.FILE); ArrayList array = list2ArrayList(filter, dir); if (array == null) { return null; } File[] files = new File[array.size()]; files = (File[]) array.toArray(files); return files; } public static File[] listFiles(String pattern) { return listFiles(pattern,new File(System.getProperty('user.dir'))); }//listfiles(pattern,dir public static File[] listFiles(String pattern, File dir) { if (!dir.exists() || !dir.isDirectory()) { System.out.println('wrong File 23'); return null; } FileFilter9 filter = new FileFilter9(pattern, FileFilter9.FILE); ArrayList array = list2ArrayList(filter, dir); if (array == null) { return null; } File[] files = new File[array.size()]; files = (File[]) array.toArray(files); return files; } public static File[] listDirs(File dir) { if (!dir.exists() || !dir.isDirectory()) { System.out.println('wrong File 23'); return null; } FileFilter9 filter = new FileFilter9(FileFilter9.DIR); ArrayList array = list2ArrayList(filter, dir); if (array == null) { return null; } File[] files = new File[array.size()]; files = (File[]) array.toArray(files); return files; } public static File[] listDirs(String pattern, File dir) { if (!dir.exists() || !dir.isDirectory()) { System.out.println('wrong File 23'); return null; } FileFilter filter = new FileFilter9(pattern, FileFilter9.DIR); ArrayList array = list2ArrayList(filter, dir); if (array == null) { return null; } File[] files = new File[array.size()]; files = (File[]) array.toArray(files); return files; } public static File[] list(File dir) { if (!dir.exists() || !dir.isDirectory()) { System.out.println('wrong File 24'); return null; } FileFilter filter = new FileFilter9(FileFilter9.BOTH); ArrayList array = list2ArrayList(filter, dir); if (array == null) { return null; } File[] files = new File[array.size()]; files = (File[]) array.toArray(files); return files; } public static File[] list(String pattern, File dir) { if (!dir.exists() || !dir.isDirectory()) { System.out.println('wrong File 25'); return null; } FileFilter filter = new FileFilter9(pattern, FileFilter9.BOTH); ArrayList array = list2ArrayList(filter, dir); if (array == null) { return null; } File[] files = new File[array.size()]; files = (File[]) array.toArray(files); return files; } public static ArrayList list2ArrayList(FileFilter filter, File dir) { if (filter == null) { filter = new FileFilter9(FileFilter9.BOTH); } if (dir.isFile()) { System.out.println('wrong File9.11'); return null; } int i, j; File[] specify, dirs; //specify means files or dirs specified by the invoker. FileFilter9 filterDir = new FileFilter9(1); ArrayList array = new ArrayList(); specify = dir.listFiles(filter); dirs = dir.listFiles(filterDir); if (specify != null) { for (i = 0; i < specify.length; i++) { array.add(specify[i]); } } ArrayList array1; if (dirs != null) { for (i = 0; i < dirs.length; i++) { array1 = File9.list2ArrayList(filter, dirs[i]); if (array1 != null) { array.addAll(array1); } } } return array; } public static String getRelativePath(File file, File dir) { String sFile, sDir; if (file == null) { System.out.println('wrong,file9.33'); return null; } sFile = file.getAbsolutePath(); if (dir == null) { return sFile; } sDir = dir.getParentFile().getAbsolutePath(); return Str9.replaceAll(sDir, '', sFile); }//firstName(; public static String firstName(File f) { int i = f.getName().lastIndexOf('.'); if (i> 0) return f.getName().substring(0, i); return null; }//lastName(; public static String lastName(File f) { int i = f.getName().lastIndexOf('.'); return f.getName().substring(i + 1); } public static String firstName(String s) { return s.substring(0, s.lastIndexOf('.')); } public static String lastName(String s) { return s.substring(s.lastIndexOf('.') + 1); }//createNew() public static File createNew() { while (true) { File f = new File(String.valueOf(Math.random())); if (!f.exists()) return f; } } public static File createNew(String pre) { int i=1; while (true) { File f = new File(pre + i++); if (!f.exists()) return f; } } public static File oldest(String pattern) { return oldest(pattern, new File(System.getProperty('user.dir'))); }//oldest(pattern,dir) public static File oldest(String pattern, File dir) { File[] ff = listFiles(pattern, dir); long l1 = Long.MAX_VALUE, l2; int k = 0; for (int i = 0; i < ff.length; i++) { l2 = ff[i].lastModified(); if (l1> l2) { k = i; l1 = l2; } } return ff[k]; }//exchange public static boolean exchange(File f, File ff) { return exchangeName(f, ff); } public static boolean exchangeName(File f, File ff) { int i, j, k; File f1; do { File f2 = new File(String.valueOf(Math.random())); if (!f2.exists()) { f1 = f2; break; } } while (true); if (f.renameTo(f1)) { if (ff.renameTo(f)) { if (f1.renameTo(ff)) return true; } } return false; } //rename public static boolean rename(File d1,File d2){ File[] files=d1.listFiles(); if(d2.exists()) { out.b('alreday exists!'); return false; } d2.mkdirs(); String d2s=d2.getPath(); for(int i=0;i