Java I/O之FilenameFilter类列举出指定路径下某个扩展名的文件

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。

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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