暂时理解不够彻底  有空在详细介绍，先记录代码

1：创建一个工具类  存取当前登录用户

1 package com.liveyc.eloan.util; 2  3 import javax.servlet.http.HttpSession; 4  5 import org.springframework.web.context.request.RequestContextHolder; 6 import org.springframework.web.context.request.ServletRequestAttributes; 7  8 import com.liveyc.eloan.base.domain.Logininfo; 9 10 11 /**12  * 存取当前登录用户的工具类13  * 14  * @author Administrator15  * 16  */17 public class UserContext {18 19     public static final String CURRENT_LOGININFO_IN_SESSION = "logininfo";20 21     private static HttpSession getSession() {22         return ((ServletRequestAttributes) RequestContextHolder23                 .getRequestAttributes()).getRequest().getSession();24     }25 26     public static void putCurrent(Logininfo current) {27         getSession().setAttribute(CURRENT_LOGININFO_IN_SESSION, current);28     }29 30     public static Logininfo getCurrent() {31         return (Logininfo) getSession().getAttribute(32                 CURRENT_LOGININFO_IN_SESSION);33     }34 35 }

2：在Controller所在的项目的web.xml中配置监听器

1 
     
      2     
      
       org.springframework.web.context.request.RequestContextListener
      3 
     

看源码可发现 包装过程

所以在util工具类中 session的获取方式