一、web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>z-springmvc-loginIntercept</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>*.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</we
二、mvc.xml
<?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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 配置渲染器 --> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <!-- 结果视图的前缀--> <property name="prefix" value="/WEB-INF/jsp/"/> <!-- 结果视图的后缀--> <property name="suffix" value=".jsp"/> </bean> <!-- 自动扫描com.springmvc.controller包下的controller--> <context:component-scan base-package="com.springmvc.controller"></context:component-scan> <!-- 拦截器配置--> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/><!-- 拦截所有--> <bean class="com.springmvc.intercept.LoginIntercept"> <property name="allowedPass"> <list> <value>login.do</value><!--不拦截login.do--> </list> </property> </bean> </mvc:interceptor> </mvc:interceptors> </beans>
三、controller
@Controller public class LoginController { //登陆 @RequestMapping("/login") public ModelAndView view(User user,HttpSession session){ ModelAndView view = new ModelAndView(); //判断user是否为空 以及 用户名和密码是否正确 if(user.getUsername()!=null && user.getPassword()!=null && user.getUsername().equals("jjz") && user.getPassword().equals("123456")){ session.setAttribute("user", user);//如果正确,将user保存在session中 view.setViewName("index");//跳转到index }else{ view.setViewName("login");//否则还是在登陆页面 } return view; } //add @RequestMapping("/add") public ModelAndView add(){ System.out.println("add");//在控制台打印add ModelAndView view = new ModelAndView(); view.setViewName("index");//跳转到index页面 return view; } }
四、intercept、
public class LoginIntercept implements HandlerInterceptor{ private List<String> allowedPass;//允许通过的url集合 @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object obj) throws Exception { Object user = request.getSession().getAttribute("user");//获取session中的user if(user!=null)//如果user不为空,直接返回true return true; String url = request.getRequestURL().toString();//获取url for (String temp : allowedPass) {//循环允许通过的url集合,检验当前的url是否在允许通过的url集合中 if(url.endsWith(temp)){//如果是,直接返回true return true; } } response.sendRedirect(request.getContextPath()+"/jsp/login.jsp");//否则直接重定向的login.jsp(此处错误,不能直接访问web-inf下的页面) return false; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object obj, ModelAndView view) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object obj, Exception exception) throws Exception { } //setAllowedPass public void setAllowedPass(List<String> allowedPass) { this.allowedPass = allowedPass; } }