<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">
      <!-- 啟動Spring MVC的注解功能，完成請求和注解POJO的映射 注解請求映射
      默認是ISO-88859-1，避免亂碼這里設(shè)置為UTF-8 -->
      <bean class="org.springframework.http.converter.StringHttpMessageConverter">
        <property name="supportedMediaTypes" value="text/html;charset=UTF-8" />
      </bean>
      <!-- 啟動JSON格式的配置,自動將格式轉(zhuǎn)換成JSON格式，不需要其他類 -->
      <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>

@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");//解決post亂碼問題
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" />