之前一直都在用mvc的拦截器权限控制,后来上网也研究了一些这方面的知识,下面就直接分享下我对mvc的拦截器的理解,通过项目来分析吧。。。
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="http://java.sun.com/xml/ns/javaee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
- http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
- <display-name>shiro</display-name>
-
-
- <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>
-
-
- <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>
3、配置classpath下的mvc.xml文件
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
- xmlns:context="http://www.springframework.org/schema/context"
- xmlns:mvc="http://www.springframework.org/schema/mvc"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
- http://www.springframework.org/schema/context
- http://www.springframework.org/schema/context/spring-context-3.0.xsd
- http://www.springframework.org/schema/mvc
- http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
- <mvc:annotation-driven />
-
- <context:component-scan base-package="com.cat.spring.controller" />
-
-
- <mvc:interceptors>
- <mvc:interceptor>
-
- <mvc:mapping path="/member/**" />
-
- <bean class="com.cat.interceptor.MemberInterceptor" />
- </mvc:interceptor>
- </mvc:interceptors>
-
-
- <bean id="viewResolver"
- class="org.springframework.web.servlet.view.InternalResourceViewResolver">
-
- <property name="prefix">
- <value>/WEB-INF/pages/</value>
- </property>
-
- <property name="suffix">
- <value>.jsp</value>
- </property>
- </bean>
-
- </beans>
4、接着就要配置拦截器了MemberInterceptor.java
-
-
-
- package com.cat.interceptor;
-
- import java.net.URLEncoder;
-
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import javax.servlet.http.HttpSession;
-
- import org.apache.commons.lang.StringUtils;
- import org.springframework.web.servlet.HandlerInterceptor;
- import org.springframework.web.servlet.ModelAndView;
-
-
-
-
-
-
- public class MemberInterceptor implements HandlerInterceptor {
-
- public final static String SEESION_MEMBER = "seesion_member";
-
-
-
-
-
-
-
- public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,
- Exception arg3) throws Exception {
-
-
- }
-
-
-
-
-
-
-
- public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,
- ModelAndView arg3) throws Exception {
-
-
- }
-
-
-
-
-
-
-
- public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
- Object handler) throws Exception {
-
- String contextPath=request.getContextPath();
- String url=request.getServletPath().toString();
- HttpSession session = request.getSession();
- String user = (String) session.getAttribute(SEESION_MEMBER);
-
- if (StringUtils.isEmpty(user)) {
-
- 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
5、LoginController.java文件
-
-
-
- package com.cat.spring.controller;
-
- import java.net.URLDecoder;
-
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpSession;
-
- import org.apache.commons.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;
-
-
-
-
-
-
- @Controller
- public class LoginController {
-
- @RequestMapping(value = "/login", method = RequestMethod.GET)
- public ModelAndView login(String redirectURL, HttpServletRequest request) {
- ModelAndView view = new ModelAndView();
-
- 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) {
-
- if (StringUtils.isNotBlank(username) && StringUtils.isNotBlank(password)
- && username.equals("admin") && password.equals("admin")) {
-
- 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";
- }
- }
- }
6、下面就是login.jsp文件
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="utf-8"%>
- <!DOCTYPE html>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- <title>mvc权限登陆login</title>
- </head>
- <body>
- <h3>
- mvc权限登陆login
- </h3>
- <form action="submit.htm" method="post">
-
- <input type="hidden" name="redirectURL" value="${redirectURL}" />
- <table>
- <tr>
- <td>
- 账号
- </td>
- <td>
- <input type="text" name="username" />
- </td>
- <td>
- 密码
- </td>
- <td>
- <input type="password" name="password" />
- </td>
- </tr>
- <tr>
- <td colspan="2" align="center">
- <input type="submit" value="提交" />
- </td>
- </tr>
- </table>
- </form>
- </body>
- </html>
7、剩下的就是一些正常的mvc请求处理的文件,这里就不赘诉了
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
9、因为篇幅问题,一些不重要的文件没有一一贴出来,有需要的可以到http://download.csdn.net/detail/a124753561/7098925下载源代码。