Java I/O之用FilenameFilter实现根据文件扩展名删除文件

packagecom.it161.demo;

importjava.io.*;

publicclassFileChecker {

privatestaticfinalString FILE_DIR ="c:\\folder";

privatestaticfinalString FILE_TEXT_EXT =".txt";

publicstaticvoidmain(String args[]) {

newFileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT);

}

publicvoiddeleteFile(String folder, String ext){

GenericExtFilter filter =newGenericExtFilter(ext);

File dir =newFile(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 =newStringBuffer(FILE_DIR)

.append(File.separator)

.append(file).toString();

fileDelete =newFile(temp);

booleanisdeleted = fileDelete.delete();

System.out.println("file : "+ temp +" is deleted : "+ isdeleted);

}

}

//inner class, generic extension filter

publicclassGenericExtFilterimplementsFilenameFilter {

privateString ext;

publicGenericExtFilter(String ext) {

this.ext = ext;

}

publicbooleanaccept(File dir, String name) {

return(name.endsWith(ext));

}

}

}