在Java中，你可以通过实现FilenameFilter类并重写accept(File dir, String name) 方法实现文件过滤功能。
在这个例子中，我们向你展示在“c:\folder”路径下列出所有“.txt”格式的文件并删除。
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package com.it161.demo; import java.io.*; public class FileChecker { private static final String FILE_DIR = "c:\folder"; private static final String FILE_TEXT_EXT = ".txt"; public static void main(String args[]) { new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT); } public void deleteFile(String folder, String ext){ GenericExtFilter filter = new GenericExtFilter(ext); File dir = new File(folder); //list out all the file name with .txt extension String[] list = dir.list(filter); if (list.length == 0) return; File fileDelete; for (String file : list){ String temp = new StringBuffer(FILE_DIR) .append(File.separator) .append(file).toString(); fileDelete = new File(temp); boolean isdeleted = fileDelete.delete(); System.out.println("file : " + temp + " is deleted : " + isdeleted); } } //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)); } }}
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