springmvc中将值存入session，jsp页面获取（ps:加获取不去值的坑）

在session中存值：

public ModelAndView loginCkeck(ShopUser shopUser, HttpSession httpSession){
        ModelAndView fail = new ModelAndView("login");
        String username = shopUser.getUsername();
        String password = shopUser.getUpassword();

        List<ShopUser> list =userLoginService.login(username,password);
        if( (list != null) &&(list.size()>=1) ){
            httpSession.setAttribute("userInfo",list.get(0));
            return new ModelAndView("redirect:/category");
        }else{
            return fail.addObject("fail","用户名或密码错误");
        }
    }

在前台页面中取值：

			<c:choose>
					<c:when test="${not empty sessionScope.get("userInfo")}">
						<li id="headerLogin" class="headerLogin" style="display: list-item;">
								${sessionScope.get("userInfo").username}<a href="./user_logout.action">[退出]</a>|
						</li>
						<li id="headerLogout" class="headerLogout" style="display: list-item;"><a href="./order_findByUid.action?page=1">我的订单</a>|
						</li>
					</c:when>
					<c:otherwise>
						<li id="headerLogin" class="headerLogin" style="display: list-item;"><a href="./user_LoginPage">会员登录</a>|</li>
						<li id="headerRegister" class="headerRegister" style="display: list-item;"><a href="./user_RegistPage">会员注册</a>|</li>
					</c:otherwise>

				</c:choose>

这里有个坑就是在JSTL表达式的前后不能出现空格，否则不会生效