spring boot 返回json There was an unexpected error (type=Not Found, status=404).

在作一個spring boot的小demo的時候，徹底是按照其餘人的例子來作的，可是運行之後返回界面始終是404：spring Whitelabel Error Page   This application has no explicit mapping for /error, so you are seeing this as a fallback. Tue Apr 17 13:12:15 C

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