Java IO 之 FileFilter与FilenameFilter

FileFilter与FilenameFilter可以实现对文件的过滤，他们都是接口，具体的过滤规则需要我们自己编写

1、FileFilter

 1 package org.zln.io.file;
 2 
 3 import java.io.File;
 4 import java.io.FileFilter;
 5 
 6 /**
 7  * 拓展名过滤器 只返回指定拓展名的文件
 8  * Created by coolkid on 2015/6/21 0021.
 9  */
10 public class ExtensionFilter implements FileFilter{
11 
12     //拓展名
13     private String extension;
14 
15     public ExtensionFilter(String extension) {
16         this.extension = extension;
17     }
18 
19     @Override
20     public boolean accept(File file) {
21         boolean result = false;
22 
23         if (file.isDirectory()){//目录 过滤掉
24             result = false;
25         }else {
26             String fileName = file.getName();//文件名  不是全路径
27             int index = fileName.lastIndexOf(".");
28             if (index == -1){
29                 result = false;
30             }else if (index == fileName.length()-1){
31                 result = false;
32             }else {
33                 if (this.extension.equalsIgnoreCase(fileName.substring(index+1))){
34                     result = true;
35                 }
36             }
37         }
38         return result;
39     }
40 }

E:\GitHub\tools\JavaEEDevelop\Lesson1_JavaSe_Demo1\src\org\zln\io\file\ExtensionFilter.java