Java實現的中文文件名排序

中文字符串排序確定要用到中文排序的Comparator，幸運的是，java有提供這樣的Comparator。

獲取方法：

Collator.getInstance(java.util.Locale.CHINA);

下面是，本身封裝的一個文件排序的類，有四種排序方法。

 

package com.test;

import java.io.File;
import java.sql.Date;
import java.text.Collator;
import java.util.Arrays;
import java.util.Comparator;

public class FileSorter implements Comparator<File>{
    /**默認排序的方式， 按目錄，文件排序TYPE_DIR*/
    public static final int TYPE_DEFAULT             = -1;
    /**按修改時間，降序*/
    public static final int TYPE_MODIFIED_DATE_DOWN = 1;
    /**按修改時間，升序*/
    public static final int TYPE_MODIFIED_DATE_UP    = 2;
    /**按文件大小，降序*/
    public static final int TYPE_SIZE_DOWN            = 3;
    /**按文件大小，升序*/
    public static final int TYPE_SIZE_UP            = 4;
/*  public static final int TYPE_NAME_DOWN            = 5;
    public static final int TYPE_NAME_UP            = 6;*/
    /**按文件名*/
    public static final int TYPE_NAME                 = 5;
    /**按目錄，文件排序*/
    public static final int TYPE_DIR                = 7;
   
    private int mType = -1;
   
    public FileSorter(int type) {
        if (type < 0 || type > 7) {
            type = TYPE_DIR;
        }
        mType = type;
    }
    @Override
    public int compare(File object1, File object2) {
       
        int result = 0;
       
        switch (mType) {
       
        case TYPE_MODIFIED_DATE_DOWN://last modified date down
            result = compareByModifiedDateDown(object1, object2);
            break;
           
        case TYPE_MODIFIED_DATE_UP://last modified date up
            result = compareByModifiedDateUp(object1, object2);
            break;
           
        case TYPE_SIZE_DOWN:    // file size down
            result = compareBySizeDown(object1, object2);
            break;
           
        case TYPE_SIZE_UP:        //file size up
            result = compareBySizeUp(object1, object2);
            break;
           
        case TYPE_NAME:            //name
            result = compareByName(object1, object2);
            break;
           
        case TYPE_DIR:            //dir or file
            result = compareByDir(object1, object2);
            break;
        default:
            result = compareByDir(object1, object2);
            break;
        }
        return result;
    }
    private int compareByModifiedDateDown(File object1, File object2) {
       
        long d1 = object1.lastModified();
        long d2 = object2.lastModified();
       
        if (d1 == d2){
            return 0;
        } else {
            return d1 < d2 ? 1 : -1;
        }
    }
    private int compareByModifiedDateUp(File object1, File object2) {
       
        long d1 = object1.lastModified();
        long d2 = object2.lastModified();
       
        if (d1 == d2){
            return 0;
        } else {
            return d1 > d2 ? 1 : -1;
        }
    }
    private int compareBySizeDown(File object1, File object2) {
       
        if (object1.isDirectory() && object2.isDirectory()) {
            return 0;
        }
        if (object1.isDirectory() && object2.isFile()) {
            return -1;
        }
        if (object1.isFile() && object2.isDirectory()) {
            return 1;
        }
        long s1 = object1.length();
        long s2 = object2.length();
       
        if (s1 == s2){
            return 0;
        } else {
            return s1 < s2 ? 1 : -1;
        }
    }
    private int compareBySizeUp(File object1, File object2) {
       
        if (object1.isDirectory() && object2.isDirectory()) {
            return 0;
        }
        if (object1.isDirectory() && object2.isFile()) {
            return -1;
        }
        if (object1.isFile() && object2.isDirectory()) {
            return 1;
        }
       
        long s1 = object1.length();
        long s2 = object2.length();
       
        if (s1 == s2){
            return 0;
        } else {
            return s1 > s2 ? 1 : -1;
        }
    }
    private int compareByName(File object1, File object2) {
       
        Comparator<Object> cmp = Collator.getInstance(java.util.Locale.CHINA);
       
        return cmp.compare(object1.getName(), object2.getName());
    }
    private int compareByDir(File object1, File object2) {
       
        if (object1.isDirectory() && object2.isFile()) {
            return -1;
        } else if (object1.isDirectory() && object2.isDirectory()) {
            return compareByName(object1, object2);
        } else if (object1.isFile() && object2.isDirectory()) {
            return 1;
        } else {  //object1.isFile() && object2.isFile())
            return compareByName(object1, object2);
        }
    }
    //for test
    public static void main(String[] args){
        
        File[] list = new File("/usr").listFiles();
        Arrays.sort(list, new FileSorter(FileSorter.TYPE_SIZE_UP));
        printFileArray(list);
    }
    //for test
    private static void printFileArray(File[] list) {
       
        System.out.println("文件大小\t\t文件修改日期\t\t文件類型\t\t文件名稱");
       
        for (File f : list) {
            System.out.println(f.length() + "\t\t" + new Date(f.lastModified()).toString() + "\t\t" + (f.isDirectory() ? "目錄" : "文件") + "\t\t" +  f.getName() );
        }
    }
   
}