使用System.getProperty("user.dir")获取项目下的文件内容

    public static Properties getProperties(String pathInDemo) throws IOException {
        Properties properties = new Properties();

        String path = System.getProperty("user.dir") + "/src/main/resources/" + pathInDemo;
        
        File file = new File(path);

        BufferedReader bufferedReader = null;
        try {
            bufferedReader = new BufferedReader(new FileReader(file));
            properties.load(bufferedReader);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return properties;
    }

    public static void main(String[] args) throws IOException {
        System.out.println("libreoffice.path=" + getConfig("config\\certificate.properties", "libreoffice.path"));
        System.out.println(
                "certificate.image.suffix=" + getConfig("config\\certificate.properties", "certificate.image.suffix"));
    }