解决方法如下：

  • 在pom.xml文件中添加json所需要的依赖

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    <!--json所需要的依赖-->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.7.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.7.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.7.3</version>
    </dependency>

  • 在SpringMVC的配置文件中配置对应的Bean

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    <!--转化json-->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <!--json视图拦截器，读取到@ResponseBody的时候去配置它-->
                <ref bean="mappingJacksonHttpMessageConverter"/>
            </list>
        </property>
    </bean>
    <!--json转化器，它可以将结果转化-->
    <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
            	<value>application/json;charset=UTF-8</value>
            </list>
        </property>
    </bean>

    ​