Java使用FilenameFilter查找出目录下指定后缀的文件示例

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(); } }}