【問題】
請求報500，一直以為是后台問題
【原因】
前端thymeleaf模板代碼沒寫完整原因（既然用了就要寫好格式）
【解決】
將用到thymeleaf標簽代碼補全，主要原因沒用這個@{}補全th:href標簽
<a th:href="@{/uploadmoment/mvmain}" title="">首頁</a>
ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - [log,175] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception thymeleaf: Could not parse as expression: ""
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