springmvc 获取session request

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>

//通过监听器获取session 和request对象我们直接看代码

import javax.servlet.ServletRequestEvent;

import javax.servlet.ServletRequestListener;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;

import org.springframework.web.context.ContextLoader;

import org.springframework.web.context.WebApplicationContext;

import com.ece.ec.service.SystemConfig;

public class ChannelListener implements HttpSessionListener, ServletRequestListener{

@Override

public void requestDestroyed(ServletRequestEvent arg0) {

}

@Override

public void requestInitialized(ServletRequestEvent event) {

WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();

SystemConfig config = (SystemConfig)wac.getBean("systemConfig");

HttpServletRequest request = (HttpServletRequest)event.getServletRequest();

request.setAttribute("channelId", config.getChannel());

}

@Override

public void sessionCreated(HttpSessionEvent arg0) {

}

@Override

public void sessionDestroyed(HttpSessionEvent arg0) {

}

}