Java I/O之用FilenameFilter实现根据文件扩展名删除文件
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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