你返回的是json，就需要配置json converter吧

<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<!-- 将StringHttpMessageConverter的默认编码设为UTF-8 -->
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8" />
<property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
</bean>
<!-- 将Jackson2HttpMessageConverter的默认格式化输出设为true -->
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="prettyPrint" value="true"/>
<property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
</bean>
</mvc:message-converters>
</mvc:annotation-driven>

@saximoer 您能说一下为什么后来不用Spring Data JPA吗