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

import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

//获取request对象

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder

.getRequestAttributes()).getRequest();

//获取session对象

HttpSession session = request.getSession(true);

应用在一些变量需要做全局变量的时候。

如：购物车的数量

int shopcartnum = ...............;

session.setAttribute("shopcartnum", shopcartnum);

在jsp中获取全局变量

<div>${shopcartnum}</div>

springmvc session request