第一种方法：

<!-- 编码过滤器 -->
在你项目中web.xml配置过滤器，进行编码拦截

<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

第二种方法：

@RequestMapping(value = "/login",method = RequestMethod.POST, produces = "application/json;charset=utf-8")