从session中获取当前用户的工具类

 package cn.crmx.crm.util;

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

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

 import cn.crmx.crm.domain.Employee;
 /**
  * @Name UserContextUtil
  * @Descr 用户上下文对象：设置和获取HttpSession登录的用户
  * @author lne
  * @date 2016年10月16日下午1:04:21
  */
 public class UserContextUtil {
     public static final String LOGIN_USER = "loginUser";

     public static void setUser(Employee emp, HttpSession session) {
         session.setAttribute(LOGIN_USER, emp);
     }

     public static Employee getUser(HttpSession session) {
         return (Employee)session.getAttribute(LOGIN_USER);
     }

     public static Employee getUser() {
         return (Employee)getsession().getAttribute(LOGIN_USER);
     }

     public static HttpSession getsession() {
         return getRequest().getSession();
     }

     public static HttpServletRequest getRequest()
     {
       ServletRequestAttributes requestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();

       HttpServletRequest request = requestAttributes.getRequest();

       return request;
     }
 }

使用事项:

　　1. 需要spring的contextjar包支持.

　　2. 使用get方法即可获取相应的东西.