modelAndView.addObject("loginUser", user);
loginUser里面有username属性
当我们想获取username时，需要加上if判断，即判断loginUser不为null
<th:block th:if="${loginUser!= null}">
<p th:text="${loginUser.username}"></p>
</th:block>
Thymeleaf之SpelEvaluationException: EL1007E: Property or field '***' canno be found on null
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