Springmvc 拦截器设置

1登录的时候咋session中设置一个值，这个值自定义

2写一个拦截器

package com.tarena.Interceptor;

import java.io.Writer;

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

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

import com.tarena.entity.User;

/**
* 登录拦截器
* @author 公共
*
*/
public class LoginInterceptor implements HandlerInterceptor{

   @Override
   public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
           throws Exception {
       // TODO Auto-generated method stub

   }

   @Override
   public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
           throws Exception {
       // TODO Auto-generated method stub

   }

   @Override
   public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
   System.out.println("-----------------------进入拦截器------------------------------");
       User user=(User) request.getSession().getAttribute("user");
   System.out.println(request.getSession());
       if(user == null){
           response.setCharacterEncoding("utf-8");
           response.setContentType("application/json");
           Writer witer = response.getWriter();
           witer.write("{\"status\":1,\"message\":\"请先登录.\"}");
           witer.close();
           return false;
       }else{
           return true;
       }


   }

}

3配置文件

<mvc:interceptors>
<mvc:interceptor>
           <mvc:mapping path="/**"/>
           <mvc:exclude-mapping path="/user/*"/>
           
           <bean class="com.tarena.Interceptor.LoginInterceptor"/>
       </mvc:interceptor>
</mvc:interceptors>

原理：这样就可以这只拦截的路径，一般登录是bula不拦截的，其他的全部拦截，登录的时候给session赋值，然后其他的路劲在访问前，先执行拦截器zhon中的方法，ranh然后判断登录设置在session属性中的值是否存在，如果不存在，就被拦截，存在就能调用。

Springmvc 拦截器设置

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