Servlet 学习笔记①

    <servlet>
        <servlet-name>helloServlet</servlet-name>
        <servlet-class>servlettest.HelloServlet</servlet-class>
        <!-- 配置Servlet 初始化参数, 且该节点必须在load-on-startup 的前面 -->
        <init-param>
            <!-- 参数名 -->
            <param-name>username</param-name>
            <!-- 参数值 -->
            <param-value>root</param-value>    
        </init-param>
        
        <init-param>
            <param-name>password</param-name>
            <param-value>12345</param-value>
        </init-param>
        
        <!-- 指定Servlet被创建的时机 -->
        <load-on-startup>-1</load-on-startup>
    </servlet>

	@Override
	public void init(ServletConfig servletConfig) throws ServletException {
		System.out.println("This is init");
		
		String user = servletConfig.getInitParameter("user");
		System.out.println("user=" + user);
		
		Enumeration<String> parameterNmaes = servletConfig.getInitParameterNames();
		while (parameterNmaes.hasMoreElements()){
			String name = parameterNmaes.nextElement();
			String value = servletConfig.getInitParameter(name);
		    System.out.println(name + " = " + value);
		}
		
		String servletName = servletConfig.getServletName();
		System.out.println(servletName);
	}