java如何读取resources目录和同级目录文件

/**
     * 读取resource中的文件
     */
    private static void readCurrent() {
        try {
            InputStream in = FilePath.class.getResourceAsStream("/a.properties");
            Properties properties = new Properties();
            properties.load(in);

            System.out.println(properties.getProperty("name"));
            System.out.println(properties.getProperty("password"));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

public static void readFile() {
        try {
            String path = System.getProperty("user.dir") + "/a.properties";
            File file = new File(path);
            if (file.isFile()) {
                System.out.println("找到文件");
            } else {
                System.out.println("未找到相应文件");
            }
        } catch (Exception e) {

        }
    }

public static void main(String[] args) {
        String useDir = System.getProperty("user.dir");
        System.out.println(useDir);

    }