获取指定路径下的所有指定类型的文件

/**
 * 返回传入路径下的所有.conf文件
 * @param filePath
 * @return
 * @throws FileNotFoundException
 */
public static ArrayList<File> getFilesEndWithConf(String filePath) throws FileNotFoundException {
    ArrayList<File> files = new ArrayList<>();

    File file = new File(filePath);
    if (file.isDirectory()) {
        File[] file_childrens = file.listFiles((dir,name)-> dir.isDirectory()||name.endsWith(".conf"));
        for (File file_children:file_childrens){
            if (file_children.isDirectory()){
                files.addAll(FileUtils.getFilesEndWithConf(file_children.getPath()));
            }else{
                files.add(file_children);
            }
        }
        return files;
    } else if (file.isFile()){
        files.add(file);
        return files;
    } else {
        throw new FileNotFoundException("根据指定路径未找到文件："+filePath);
    }
}