本例實現登陸時的驗證攔截，采用SpringMVC攔截器來實現
當用戶點擊到網站主頁時要進行攔截，用戶登錄了才能進入網站主頁，否則進入登陸頁面
核心代碼
首先是index.jsp,顯示鏈接
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<%@ 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>首頁</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" >登陸</a></p> <p><a href="user/home.html" rel="external nofollow" >用戶中心</a></p> <p><a href="exception.html" rel="external nofollow" >觸發異常</a></p> </div> </body></html> |
controller類
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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;/** * 這個例子講解了如何定義MVC三層注解，使用@Resource進行注入，以及使用@RequestMapping、@RequestParam 、@SessionAttributes */@Controllerpublic class LoginController extends BaseController { @Resource LoginService service; @Resource HttpServletRequest request; @RequestMapping("/exception") public void exception() throws MyException{ throw new MyException("測試springmvc中的異常捕獲"); } @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"; } } } |
當點擊用戶中心時，觸發攔截，相關配置如下
在spring-mvc.xml中加上攔截配置，攔截所有URL中包含/user/的請求，當然請求用戶中心時就會觸發這個攔截器了
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<mvc:interceptors> <mvc:interceptor> <!-- 攔截所有URL中包含/user/的請求 --> <mvc:mapping path="/user/**"/> <bean class="com.jikexueyuan.demo.springmvc.lesson4.interceptor.LoginInterceptor"></bean> </mvc:interceptor> </mvc:interceptors> |
然后是bean指向的具體的interceptor類，如果session保存的用戶信息為null，則跳到login頁面，postHandle和afterCompletion方法都不執行，反之都執行。
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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("尚未登錄，調到登錄頁面"); 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，簡單的springmvc攔截器就完成了。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://www.cnblogs.com/UniqueColor/p/5778199.html
