在jsp頁面中獲取Spring管理的Bean

<%@ page import="com.maomao.model.User"%>  //我自己的實體類
<%@ page import="com.maomao.service.UserService"%>  //我自己的service類
<%@ page import="org.springframework.context.ApplicationContext"%>

<%@ page import="org.springframework.web.context.support.WebApplicationContextUtils"%>

<%
String userid = (String)session.getValue("userid");
ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());
UserService userService = ctx.getBean("userService",UserService.class);
User u = userService.getUserById(userid);
%>