Spring mvc interceptor配置攔截器

xml代碼：

<?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: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"
 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>
   <!-- 需攔截的地址 -->
   <!-- 一級目錄 -->
   <mvc:mapping path="/*.do" />
   <mvc:mapping path="/*.ajax" />
   <mvc:mapping path="/*.htm" />

   <!-- 二級目錄 -->
   <mvc:mapping path="/*/*.do" />
   <mvc:mapping path="/*/*.ajax" />
   <mvc:mapping path="/*/*.htm" />
   <!-- 需排除攔截的地址 -->
   <mvc:exclude-mapping path="/login.htm"/>
   <bean class="com.anxin.msapweb.web.interceptor.SecurityInterceptor" />
  </mvc:interceptor>
 </mvc:interceptors>
</beans>

Java代碼：

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.msapweb.common.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);
  // 從session 裏面獲取用戶名的信息
  Object obj = session.getAttribute(Config.Passport.SESSION_NAME_LOGIN_RESULT);
  // 判斷如果沒有取到用戶信息，就跳轉到登陸頁面，提示用戶進行登陸
  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 {
 }

}