springmvc 获取session request

拼搏现实的明天。 2022-08-25 01:23 176阅读 0赞

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) \{  
  
\}  
  
  
\}