动态获取下拉列表数据

	@RequestMapping("/getServiceCityList")
	public void getServiceCityList(HttpServletResponse response,HttpServletRequest request) 
	{
		String cityId = request.getParameter("id");
		int icityId = -1;
		if (!StringUtils.isBlank(cityId) && !"undefined".equals(cityId)) {
			icityId = new Integer(cityId);
		}
		try {
			List<ServiceCity> list = serviceCitySerivce.getServerCity();
			ServiceCity sCity = new ServiceCity();
			
			sCity.setId(-1);
			sCity.setShowname("请选择");
			//sCity.setSelected(true);
			list.add(0, sCity);
			
			for(ServiceCity plt : list)
			{
				if(plt!=null)
				{
					if(plt.getId()==icityId)
					{
						plt.setSelected(true);
						break;
					}
					
				}
			}
			out(response, list);
		} catch (Exception e) {
			MessageResult result = new MessageResult();
			result = new MessageResult(ConstantUtil.M_SYSTEM_ERROR, "系统错误");
			out(response, result);
			Log4jTask.addLog("获取服务城市列表报错", System.currentTimeMillis(), Log4jTask.ERROR,
					ServiceCityController.class.getName(), e);
		}
	}

　　

			服务城市<select id="selectCity" name="selectCity" class="easyui-combobox" style=" 100px;">
		             <option value="" selected>全部</option>
		         </select> 
	   $("#selectCity").combobox({
 		url:'<%=request.getContextPath()%>/city/getServiceCityList',
 		valueField:'id',
 		textField:'showname',
	   		value:""
	   });