public String update(){
		User user = new User(this.userName, this.userPassword);
		user.setUserID(((User)session.get("user")).getUserID());
//		System.out.println(user);
		try {
			this.userServiceImpl.updateUser(user);
			return "updateSuccess";
		} catch (Exception e) {
			e.printStackTrace();
			return "updateError";
		}
	}