java遍历文件夹里面的所有文件...

List<String> getFileNames(String dir){
        List<String> fileNames = new ArrayList<String>()
        File file = new File(dir);
        if(file == null || !file.exists()){
            return fileNames;
        }
        LinkedList<File> list = new LinkedList<File>();
        File[] files = file.listFiles();
        for (File it : files) {
            if (!it.isDirectory()) {
               fileNames.add(it.name)
            }
        }
        return  fileNames
    }