1、首先准备对应的架包
2、看看项目的架构
3、基本的web.xml文件
<!--?xml version="1.0" encoding="UTF-8"?--><web-app version="2.5" xmlns="/xml/ns/javaee" xmlns:xsi="/2001/XMLSchema-instance" xsi:schemalocation="/xml/ns/javaee /xml/ns/javaee/web-app_2_5.xsd"><display-name>shiro</display-name><!-- 加载springmvc --><servlet><servlet-name>SpringMVC</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><!-- 以.htm结尾的都被mvc拦截 --><servlet-mapping><servlet-name>SpringMVC</servlet-name><url-pattern>*.htm</url-pattern></servlet-mapping><!-- 启动spring 加载 需要加载其他的spring时 需启动该监听器<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>--></web-app>
4、配置classpath下的mvc.xml文件
<!--?xml version="1.0" encoding="UTF-8"?--><beans xmlns="/schema/beans" xmlns:context="/schema/context" xmlns:mvc="/schema/mvc" xmlns:p="/schema/p" xmlns:xsi="/2001/XMLSchema-instance" xsi:schemalocation="/schema/beans/schema/beans/spring-beans-3.0.xsd/schema/context/schema/context/spring-context-3.0.xsd /schema/mvc/schema/mvc/spring-mvc-3.0.xsd"><mvc:annotation-driven><!-- 自动扫描包 --><context:component-scan base-package="com.cat.spring.controller"><!-- 配置mvc的拦截器 可以配置多个 --><mvc:interceptors><mvc:interceptor><!-- 需要被拦截的路径 --><mvc:mapping path="/member/**"><!-- 拦截处理的interceptor --><bean class="com.cat.interceptor.MemberInterceptor"></bean></mvc:mapping></mvc:interceptor></mvc:interceptors><!-- mvc返回页面的配置 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="viewResolver"><!-- 模板路径为WEB-INF/pages/ --><property name="prefix"><value>/WEB-INF/pages/</value></property><!-- 视图模板后缀为.JSP --><property name="suffix"><value>.jsp</value></property></bean></context:component-scan></mvc:annotation-driven></beans>
5、接着就要配置拦截器了MemberInterceptor.java
/*** */package com.cat.interceptor;import .URLEncoder;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import mons.lang.StringUtils;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;/*** @author chenlf* * -3-25*/public class MemberInterceptor implements HandlerInterceptor {public final static String SEESION_MEMBER = "seesion_member";/** (non-Javadoc)* * @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest,* javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)*/public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,Exception arg3) throws Exception {// TODO Auto-generated method stub}/** (non-Javadoc)* * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest,* javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)*/public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,ModelAndView arg3) throws Exception {// TODO Auto-generated method stub}/** (non-Javadoc)* 拦截mvc.xml配置的/member/**路径的请求* @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest,* javax.servlet.http.HttpServletResponse, java.lang.Object)*/public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler) throws Exception {//请求的路径String contextPath=request.getContextPath();String url=request.getServletPath().toString();HttpSession session = request.getSession();String user = (String) session.getAttribute(SEESION_MEMBER);//这里可以根据session的用户来判断角色的权限，根据权限来重定向不同的页面，简单起见，这里只是做了一个重定向if (StringUtils.isEmpty(user)) {//被拦截，重定向到login界面response.sendRedirect(contextPath+"/login.htm?redirectURL="+ URLEncoder.encode(url));return false;}return true;}}
这样拦截器的核心就配置完了，接下来就是一些登陆的处理操作
6、LoginController.java文件
package com.cat.spring.controller;import .URLDecoder;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import mons.lang.StringUtils;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import com.cat.interceptor.MemberInterceptor;/*** @author chenlf* * -3-24*/@Controllerpublic class LoginController {@RequestMapping(value = "/login", method = RequestMethod.GET)public ModelAndView login(String redirectURL, HttpServletRequest request) {ModelAndView view = new ModelAndView();//把拦截前路径存下来，以便登入成功可以直接请求到登录前的页面view.addObject("redirectURL", redirectURL);view.setViewName("/login");return view;}@RequestMapping(value = "/submit", method = RequestMethod.POST)public String submit(String username, String password, String redirectURL,HttpServletRequest request) {//模拟登陆成功 用户admin 密码admin的用户if (StringUtils.isNotBlank(username) && StringUtils.isNotBlank(password)&& username.equals("admin") && password.equals("admin")) {//当登陆成功是，将用户信息存放到session中去HttpSession session = request.getSession();session.setAttribute(MemberInterceptor.SEESION_MEMBER, "admin");if (StringUtils.isNotBlank(redirectURL)) {return "redirect:" + URLDecoder.decode(redirectURL);}return "redirect:/member/index.htm";} else {if (StringUtils.isNotBlank(redirectURL)) {return "redirect:/login.htm?" + URLDecoder.decode(redirectURL);}return "redirect:/login.htm";}}
7、下面就是login.jsp文件
<%@ page language="java"contentType="text/html; charset=UTF-8"pageEncoding="utf-8"%>8、到这里看看效果吧
a、当非登陆状态的时候，请求localhost:8010/demo-mvc/member/list.htm时，被拦截拦截，重定向到login页面，并携带了当前的这个路径（/member/list.htm）作为参数传到页面b、输入正确的用户名admin 密码admin后登陆，会跳转到拦截前的页面
c、当登陆完成后，输入地址为http://localhost:8010/demo-mvc/member/index.htm，session中记录着当前用户的信息，不需要重新登陆了
