2,SessionInterceptor

package com.yuqiyu.jpf.config;

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

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

public class SessionInterceptor  implements HandlerInterceptor{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {
        System.out.println(request.getRequestURI());
  //登录不做拦截
        if(request.getRequestURI().equals("/api/login")||request.getRequestURI().equals("/api/loginout") )
        {
            return true;
        }
    //验证session是否存在

        String username= (String) request.getSession().getAttribute("username");
        if(username == null)
        {
            response.sendRedirect("/api/loginout");
            return false;
        }
  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 {

    }
}