Spring mvc interceptor配置拦截器

xml代码：

<?xml  version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework/schema/beans"
 xmlns:xsi="http://www.w3/2001/XMLSchema-instance" xmlns:context="http://www.springframework/schema/context"
 xmlns:mvc="http://www.springframework/schema/mvc"
 xsi:schemaLocation="http://www.springframework/schema/beans  
        http://www.springframework/schema/beans/spring-beans.xsd  
        http://www.springframework/schema/context  
        http://www.springframework/schema/context/spring-context.xsd  
        http://www.springframework/schema/mvc  
        http://www.springframework/schema/mvc/spring-mvc.xsd"
 default-autowire="byName">
 <!-- auto register Processor -->
 <context:annotation-config />
 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
  <property name="basePackage" value="com.anxin.msapweb.db.mybatis.mapper" />
 </bean>

 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  <property name="dataSource" ref="db2dataSource" />
 </bean>

 <mvc:interceptors>
  <mvc:interceptor>
   <!-- 需拦截的地址 -->
                        <!-- 一级目录 -->
   <mvc:mapping path="/*.do" />
   <mvc:mapping path="/*.ajax" />
   <mvc:mapping path="/*.htm" />

                        <!-- 二级目录 -->
   <mvc:mapping path="/*/*.do" />
   <mvc:mapping path="/*/*.ajax" />
   <mvc:mapping path="/*/*.htm" />
   <!-- 需排除拦截的地址 -->
   <mvc:exclude-mapping path="/login.htm"/>
   <bean class="com.anxin.msapweb.web.interceptor.SecurityInterceptor" />
  </mvc:interceptor>
 </mvc:interceptors>
</beans>

Java代码：

package com.anxin.msapweb.web.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.anxin.msapwebmon.Config;

public class SecurityInterceptor implements HandlerInterceptor {

 private static final String LOGIN_URL = "/login.htm";

 @Override
 public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object handler) throws Exception {
  HttpSession session = req.getSession(true);
  // 从session 里面获取用户名的信息
  Object obj = session.getAttribute(Config.Passport.SESSION_NAME_LOGIN_RESULT);
  // 判断如果没有取到用户信息，就跳转到登陆页面，提示用户进行登陆
  if (obj == null || "".equals(obj.toString())) {
   res.sendRedirect(LOGIN_URL);
  }
  return true;
 }

 @Override
 public void postHandle(HttpServletRequest req, HttpServletResponse res, Object arg2, ModelAndView arg3) throws Exception {
 }

 @Override
 public void afterCompletion(HttpServletRequest req, HttpServletResponse res, Object arg2, Exception arg3) throws Exception {
 }

}