springmvc 获取session request

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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) {

}

}

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