Cannot find class [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter]

 <!--避免IE执行AJAX时，返回JSON出现下载文件 -->
     <bean id="mappingJacksonHttpMessageConverter"
         class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
         <property name="supportedMediaTypes">
             <list>
                 <value>text/html;charset=UTF-8</value>
             </list>
         </property>
     </bean>  

无法找到 "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"

这个要注意spring版本，3.x和4.x配置不同

spring3.x是org.springframework.http.converter.json.MappingJacksonHttpMessageConverter

spring4.x是org.springframework.http.converter.json.MappingJackson2HttpMessageConverter

将 "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" 替换为  "org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" 即可。

参考：https://blog.csdn.net/vili_sky/article/details/73105550