报了一个这个异常：

org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation

通过这篇文章找到了“favorPathExtension”关键字，
Spring Boot完美解决(406)Could not find acceptable representation原因及解决方法
进而找到了这篇文章中的方法，解决了问题
SpringMVC restful风格

    <mvc:annotation-driven content-negotiation-manager="contentNegotiationManager" />
    
    <bean id="contentNegotiationManager"
          class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="favorPathExtension" value="false" />
        <property name="favorParameter" value="true" />
        <property name="parameterName" value="mediaType" />
        <property name="ignoreAcceptHeader" value="true"/>
        <property name="useJaf" value="false"/>
        <property name="defaultContentType" value="application/json" />

        <!--<property name="mediaTypes">
            <map>
                <entry key="json" value="application/json" />
                <entry key="xml" value="application/xml" />
            </map>
        </property>-->
    </bean>