【新】使用fastjson作为SpringMVC的HttpMessageConverter

网上抄的老的配置信息：

---

mvc:annotation-driven
<mvc:message-converters register-defaults="true">



text/html;charset=UTF-8
application/json
application/xml;charset=UTF-8

WriteMapNullValue

WriteNullNumberAsZero
WriteNullListAsEmpty
WriteNullStringAsEmpty
WriteNullBooleanAsFalse
WriteDateUseDateFormat

</mvc:message-converters>
</mvc:annotation-driven>
但是我们拷贝过去后发现，已经被弃用

于是我打开 FastJsonHttpMessageConverter这个类

所以，我们需要这么配置：

WriteMapNullValue
WriteMapNullValue

WriteNullNumberAsZero
WriteNullListAsEmpty
WriteNullStringAsEmpty
WriteNullBooleanAsFalse
WriteDateUseDateFormat



<mvc:annotation-driven >
mvc:message-converters

text/html;charset=UTF-8
application/json;charset=UTF-8

</mvc:message-converters>
</mvc:annotation-driven>