ThreadLocalを使用してセッションを保存し、他の場所でユーザー情報を呼び出すのに便利です.

package com.urt.core.web;

import javax.servlet.http.HttpSession;

import com.urt.core.authority.entity.User;

/** 
 *   Session   ，   Controller       
 * @author happyqing
 * @date 2015-4-25
 */
public class UserSession {
	private static final ThreadLocal userSession = new ThreadLocal();
	
	public static void setUserSession(HttpSession session) {
		userSession.set(session);
    }
  
    public static HttpSession getUserSession() {
        return userSession.get();
    }
    
    public static User getUser(){
		return (User)userSession.get().getAttribute("user");
	}
    
    public static void setAttribute(String key, Object value){
    	userSession.get().setAttribute(key, value);
	}
    
    public static Object getAttribute(String key){
    	return userSession.get().getAttribute(key);
	}

}