SpringMVC返回json数据的三种方式

public class JsonUtil 
{ 
  private static Gson gson=new Gson(); 
 
  /** 
   * @MethodName : toJson 
   * @Description : 将对象转为JSON串，此方法能够满足大部分需求 
   * @param src 
   *      :将要被转化的对象 
   * @return :转化后的JSON串 
   */ 
  public static String toJson(Object src) { 
    if (src == null) { 
      return gson.toJson(JsonNull.INSTANCE); 
    } 
    return gson.toJson(src); 
  } 
} 

@ResponseBody 
 @RequestMapping("/list") 
 public List<String> list(ModelMap modelMap) { 
  String hql = "select c from Clothing c "; 
  Page<Clothing> page = new Page<Clothing>(); 
  page.setPageSize(6); 
  page = clothingServiceImpl.queryForPageByHql(page, hql); 
   
  return page.getResult(); 
 }

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" 
    p:ignoreDefaultModelOnRedirect="true" > 
      <property name="messageConverters"> 
        <list> 
          <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> 
        </list> 
      </property> 
    </bean>