解决SpringMvc后台接收json数据中文乱码问题的几种方法

@ResponseBody
@RequestMapping(value="/getJsonDataByCityName",produces="application/json")
public String getJsonByName(HttpServletRequest request,HttpServletResponse response,@RequestParam String city_name)throws ServletException,IOException
{
  //response.setContentType("text/html;charset=UTF-8");

  //request.setCharacterEncoding("UTF-8");//解决post乱码问题
  System.out.println(request.getCharacterEncoding());
  city_name = new String(city_name.getBytes("ISO-8859-1"), "UTF-8");
  System.out.println("city_name:"+city_name);
}

<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" URIEncoding="UTF-8" />

<!-- 中文编码 -->
  <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>

<mvc:annotation-driven>
  <mvc:message-converters register-defaults="true">
    <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 注解请求映射
    默认是ISO-88859-1，避免乱码这里设置为UTF-8 -->
    <bean class="org.springframework.http.converter.StringHttpMessageConverter">
      <property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
    </bean>
    <!-- 启动JSON格式的配置,自动将格式转换成JSON格式，不需要其他类 -->
    <bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
      <property name="supportedMediaTypes" value="application/json;charset=UTF-8" />
    </bean>
  </mvc:message-converters>
</mvc:annotation-driven>