使用FilenameFilter来找出目录下指定后缀的文件

package net.csdn.johnhuster;

import java.io.File;
import java.io.FilenameFilter;

public class FileNameFilterDemo {
  //内部类
 public class FileFilter implements FilenameFilter 
 {
    private String filterRule;
     public FileFilter(String filter)
    {
        this.filterRule = filter;
     } 
         @Override
      public boolean accept(File dir, String name) {
        if(name.lastIndexOf('.')>0)
        {
           // get last index for '.' char
           int lastIndex = name.lastIndexOf('.');
                  
          // get extension
          String str = name.substring(lastIndex);
                  
           // match path name extension
           if(str.equals(this.filterRule))
           {
           return true;
           }
          }
         return false;
 }
 public static void main(String[] args)
 {            
File f = null;      
File[] paths;      
FileNameFilterDemo fileFilter = new FileNameFilterDemo();     
 try{               
// create new file         
f = new File("d:\\fileList");                  
// 文件文件名字过滤器        
 FilenameFilter fileNameFilter = fileFilter .new FileFilter(".txt") ;         
// returns pathnames for files and directory         
paths = f.listFiles(fileNameFilter);                  
// for each pathname in pathname array         
for(File path:paths){            
// prints file and directory paths           
 System.out.println(path);         
}      
}catch(Exception e)
{         
// if any error occurs        
 e.printStackTrace();     
 }   
}
}