这是一个FilenameFilter类用法的例子，实现的列举出“c:\\folder“路径下所有以“.jpg”扩展名的文件。
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package com.it161.demo; import java.io.*; public class FindCertainExtension { private static final String FILE_DIR = "c:\\folder"; private static final String FILE_TEXT_EXT = ".jpg"; public static void main(String args[]) { new FindCertainExtension().listFile(FILE_DIR, FILE_TEXT_EXT); } public void listFile(String folder, String ext) { GenericExtFilter filter = new GenericExtFilter(ext); File dir = new File(folder); if(dir.isDirectory()==false){ System.out.println("Directory does not exists : " + FILE_DIR); return; } // list out all the file name and filter by the extension String[] list = dir.list(filter); if (list.length == 0) { System.out.println("no files end with : " + ext); return; } for (String file : list) { String temp = new StringBuffer(FILE_DIR).append(File.separator) .append(file).toString(); System.out.println("file : " + temp); } } // inner class, generic extension filter public class GenericExtFilter implements FilenameFilter { private String ext; public GenericExtFilter(String ext) { this.ext = ext; } public boolean accept(File dir, String name) { return (name.endsWith(ext)); } }} |
如果你想删除这些文件，请看本文Java I/O之用FilenameFilter实现根据文件扩展名删除文件
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Java I/O之FilenameFilter类列举出指定路径下某个扩展名的文件
原文：http://www.cnblogs.com/youqishini/p/3515530.html