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。
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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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