Java获取自定义配置文件的内容

在resources目录下定义db.properties文件

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:////jdbcdemo
username=root
password=root

获取文件信息：

 public static void main(String[] args) throws IOException {
      ClassLoader loader = Thread.currentThread().getContextClassLoader();
      InputStream resourceAsStream = loader.getResourceAsStream("db.properties");
      Properties p = new Properties();
      p.load(resourceAsStream);
      System.out.println(p.getProperty("driverClassName"));
}