java8正确处理Files.lines

需要使用 try-with-resources 语句来保证stream的close方法被调用，从而关闭打开的文件

// try-with-resources语句，等同于try-catch-finally
try(Stream stream = Files.lines(Paths.get(filePath))){
	stream.collect(Collectors.toList());
} catch (IOException e){
    logger.error("get content from{} error,{}",filePath, e);
}