<servlet>

  	<servlet-name>hello</servlet-name>

  	<servlet-class>com.qf.servlet.HelloServlet3</servlet-class>

  	<init-param>

  		<param-name>name</param-name>

  		<param-value>wxf</param-value>

  	</init-param>

  	<init-param>

  		<param-name>age</param-name>

  		<param-value>24</param-value>

  	</init-param>

  </servlet>

  <servlet-mapping>

  	<servlet-name>hello</servlet-name>

  	<url-pattern>/*</url-pattern>

  </servlet-mapping>

 public class HelloServlet extends HttpServlet {

     @Override

     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

         System.out.println("doGet");

         testServletConfig();

     }

     public void testServletConfig() {

         //得到servlet配置对象 专门用于在配置servlet的信息

         ServletConfig config = getServletConfig();

         //获取到的是配置servlet里面servlet-name 的文本内容

         String servletName = config.getServletName();

         System.out.println("servletName==="+servletName);

         System.out.println("-----------");

         //获取ServletContext

         ServletContext context = config.getServletContext();

         String path = context.getContextPath();

         System.out.println("path==="+path);

         System.out.println("-----------");

         //获取某一具体的参数

         String name = config.getInitParameter("name");

         System.out.println("name==="+name);

         System.out.println("-----------");

         //获取所有的参数名称

         Enumeration<String> names = config.getInitParameterNames();

         //遍历取出所有的参数名称

         while (names.hasMoreElements()) {

             String key = (String) names.nextElement();

             String value = config.getInitParameter(key);

             System.out.println("key==="+key + "   value==="+value);

         }

     }

 }

doGet

servletName===hello

-----------

path===/HelloServlet

-----------

name===wxf

-----------

key===name   value===wxf

key===age   value===24