file.listFiles()按文件大小、名称、日期排序方法
file.listFiles()按文件大小、名称、日期排序方法
按照文件大小排序
public static void orderByLength(String fliePath) {
List< File> files = Arrays.asList(new File(fliePath).listFiles());
Collections.sort(files, new Comparator< File>() { public int compare(File f1, File f2) { long diff = f1.length() - f2.length(); if (diff > 0) return 1; else if (diff == 0) return 0; else
return -1;
} public boolean equals(Object obj) { return true;
}
}); for (File f : files) { if(f.isDirectory()) continue;
System.out.println(f.getName()+":"+f.length());
}
}
按照文件名称排序
public static void orderByName(String fliePath) {
List files = Arrays.asList(new File(fliePath).listFiles());
Collections.sort(files, 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 f : files) {
System.out.println(f.getName());
}
}
按日期排序
public static void orderByDate(String fliePath) {
File file = new File(fliePath);
File[] fs = file.listFiles();
Arrays.sort(fs,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;
} public boolean equals(Object obj) { return true;
}
}); for (int i = fs.length-1; i >-1; i--) {
System.out.println(fs[i].getName());
System.out.println(new Date(fs[i].lastModified()));
}
}