/** * 按文件名排序 * @param filePath */ public static ArrayList<String> orderByName(String filePath) { ArrayList<String> FileNameList = new ArrayList<String>(); File file = new File(filePath); File[] files = file.listFiles(); List fileList = Arrays.asList(files); Collections.sort(fileList, new Comparator<File>() {  @Override  public int compare(File o1, File o2) {  if (o1.isDirectory() && o2.isFile())   return -1;  if (o1.isFile() && o2.isDirectory())   return 1;  return o1.getName().compareTo(o2.getName());  } }); for (File file1 : files) {  if (file1.isDirectory()) {  FileNameList.add(file1.getName());  } } return FileNameList; }

/** * 按文件修改時間排序 * @param filePath */ public static ArrayList<String> orderByDate(String filePath) { ArrayList<String> FileNameList = new ArrayList<String>(); File file = new File(filePath); File[] files = file.listFiles(); Arrays.sort(files, new Comparator<File>() {  public int compare(File f1, File f2) {  long diff = f1.lastModified() - f2.lastModified();  if (diff > 0)   return 1;  else if (diff == 0)   return 0;  else   return -1;// 如果 if 中修改為 返回-1 同時此處修改為返回 1 排序就會是遞減  }   public boolean equals(Object obj) {  return true;  }  });  for (File file1 : files) {  if (file1.isDirectory()) {  FileNameList.add(file1.getName());  } } return FileNameList; }

/** * 按文件大小排序 * @param filePath */ public static ArrayList<String> orderBySize(String filePath) { ArrayList<String> FileNameList = new ArrayList<String>(); File file = new File(filePath); File[] files = file.listFiles(); List<File> fileList = Arrays.asList(files); Collections.sort(fileList, new Comparator<File>() {  public int compare(File f1, File f2) {  long s1 = getFolderSize(f1);  long s2 = getFolderSize(f2);   long diff = s1 - s2;  if (diff > 0)   return 1;  else if (diff == 0)   return 0;  else   return -1;// 如果 if 中修改為 返回-1 同時此處修改為返回 1 排序就會是遞減  }   public boolean equals(Object obj) {  return true;  } });  for (File file1 : files) {  if (file1.isDirectory()) {  FileNameList.add(file1.getName());  } } return FileNameList; }  /** * 獲取文件夾大小 * @param file File實例 * @return long */ public static long getFolderSize(File file) {  long size = 0; try {  java.io.File[] fileList = file.listFiles();  for (int i = 0; i < fileList.length; i++) {  if (fileList[i].isDirectory()) {   size = size + getFolderSize(fileList[i]);  } else {   size = size + fileList[i].length();  }  } } catch (Exception e) {  e.printStackTrace(); } return size;}