springmvc 登录拦截器 SpringMVC拦截器——实现登录验证拦截器的代码实例
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本例实现登陆时的验证拦截,采用SpringMVC拦截器来实现
当用户点击到网站主页时要进行拦截,用户登录了才能进入网站主页,否则进入登陆页面
核心代码
首先是index.jsp,显示链接
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>" rel="external nofollow" > <title>首页</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" > --> </head> <body> <div style="margin:0 auto;padding-top:100px;font-size:18px;" align="center"> <p><a href="loginpage.html" rel="external nofollow" >登陆</a></p> <p><a href="user/home.html" rel="external nofollow" >用户中心</a></p> <p><a href="exception.html" rel="external nofollow" >触发异常</a></p> </div> </body> </html>
controller类
package com.jikexueyuan.demo.springmvc.lesson4.controller; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import com.jikexueyuan.demo.springmvc.lesson4.constant.Global; import com.jikexueyuan.demo.springmvc.lesson4.exception.MyException; import com.jikexueyuan.demo.springmvc.lesson4.model.User; import com.jikexueyuan.demo.springmvc.lesson4.service.LoginService; /** * 这个例子讲解了如何定义MVC三层注解,使用@Resource进行注入,以及使用@RequestMapping、@RequestParam 、@SessionAttributes */ @Controller public class LoginController extends BaseController { @Resource LoginService service; @Resource HttpServletRequest request; @RequestMapping("/exception") public void exception() throws MyException{ throw new MyException("测试springmvc中的异常捕获"); } @RequestMapping("/loginpage") public String toLoginPage(){ return "/WEB-INF/jsp/login.jsp"; } @RequestMapping("/user/home") public String toUserHome(){ return "/WEB-INF/jsp/userhome.jsp"; } @RequestMapping("/logout") public String logout(){ request.getSession().removeAttribute(Global.USER_SESSION_KEY); return "redirect:/"; } @RequestMapping(value = "/doLogin", method = RequestMethod.POST) public String doLogin(@RequestParam String userName, @RequestParam String password){ try { User user = service.doLogin(userName, password); request.getSession().setAttribute(Global.USER_SESSION_KEY, user); return "redirect:/user/home.html"; } catch (Exception e) { return "/WEB-INF/jsp/login.jsp"; } } }
当点击用户中心时,触发拦截,相关配置如下
在spring-mvc.xml中加上拦截配置,拦截所有URL中包含/user/的请求,当然请求用户中心时就会触发这个拦截器了
<mvc:interceptors> <mvc:interceptor> <!-- 拦截所有URL中包含/user/的请求 --> <mvc:mapping path="/user/**"/> <bean class="com.jikexueyuan.demo.springmvc.lesson4.interceptor.LoginInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
然后是bean指向的具体的interceptor类,如果session保存的用户信息为null,则跳到login页面,postHandle和afterCompletion方法都不执行,反之都执行。
package com.jikexueyuan.demo.springmvc.lesson4.interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import com.jikexueyuan.demo.springmvc.lesson4.constant.Global; public class LoginInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { Object user = request.getSession().getAttribute(Global.USER_SESSION_KEY); if (user == null) { System.out.println("尚未登录,调到登录页面"); response.sendRedirect("/loginpage.html"); return false; } return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("postHandle"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("afterCompletion"); } }
至此,简单的springmvc拦截器就完成了。
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