登录拦截器的使用

spring中登录拦截器的使用

步骤1：实现接口：

public methodName implements HandlerInterceptor(){}

步骤2：

配置spring：

步骤3：

如果不是在spring的主配置文件中配置上面的代码，需要在spring中引入包

 1：实现接口

package com.business.system.common;

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

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

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        HttpSession session = httpServletRequest.getSession();
        Object business = session.getAttribute("business");
        String requestURI = httpServletRequest.getRequestURI();
        if(business==null){
            System.out.println("没有登录，无法访问requestURI="+requestURI);
            httpServletResponse.sendRedirect("/business/loginPage");
            return false;
        }else {
            System.out.println("登陆成功");
           return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

2：在spring中配置拦截操作

<?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: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/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
   <mvc:interceptors>
       <mvc:interceptor>
           <mvc:mapping path="/**"/>
           <mvc:exclude-mapping path="/business/*"/>
           <bean class="com.business.system.common.LoginInterceptor"/>
       </mvc:interceptor>
   </mvc:interceptors>
</beans>