{key1：value1，key2：value2}

response.setContentType("text/JSON;charset=utf-8");
response.getWriter().print(gson.toJson(page));
response.getWriter().flush();
response.getWriter().close();
return null;

@Controller
@RequestMapping("/json")
public class JsonController {
  @RequestMapping(value="{provinceId}",method = RequestMethod.GET)
  @ResponseBody
  public String pagination(@PathVariable String provinceId){
    return getJsonData(provinceId);
  }
}

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="webBindingInitializer">
      <bean class="com.mvc.commons.CommonsBindingInitializer" />
    </property>
    
    <property name="messageConverters">
      <list>
      <bean class="org.springframework.http.converter.StringHttpMessageConverter">
          <property name="supportedMediaTypes">
            <list>
              <value>text/plain;charset=UTF-8</value>
            </list>
          </property>
        </bean>
      </list>
    </property>
  </bean>