modelAndView.addObject("loginUser", user);
loginUser里面有username屬性
當我們想獲取username時，需要加上if判斷，即判斷loginUser不為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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