spring MVC Interceptor 的配置

转自：https://blog.csdn.net/xiaodingdou/article/details/52621075

xml配置：

<?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.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);  
  // 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 {  
 }  
  
}