Android向Rest服务Post数据遇到的Date类型数据问题

//利用Gson实现对象序列化为Json
public static String toJson(Object object) {
　　GsonBuilder builder = new GsonBuilder();
　　// 不转换没有 @Expose 注解的字段
　　builder.excludeFieldsWithoutExposeAnnotation();
　　//对Date类型进行注册事件
　　builder.registerTypeAdapter(Date.class, new UtilDateSerializer());
　　Gson gson = builder.create();
　　return gson.toJson(object);
}
    
class UtilDateSerializer implements JsonSerializer<Date> {
　　@Override
　　public JsonElement serialize(Date src, Type typeOfSrc,
     　　　JsonSerializationContext context) {
　　　　//拼凑UTC时间类型
　　　　return new JsonPrimitive("/Date(" + src.getTime()+ "+0800)/");
　　}
}

/**
 * 通过POST方式发送请求
* 
 * @param url
*            URL地址
* @param params
*            参数
* @return
* @throws Exception
 */
public String httpPost(String url, String json) throws Exception {
　　String response = null;
　　int timeoutConnection = 3000;
　　int timeoutSocket = 5000;
　　HttpParams httpParameters = new BasicHttpParams();
　　HttpConnectionParams.setConnectionTimeout(httpParameters,timeoutConnection);
　　HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
　　HttpClient httpClient = new DefaultHttpClient(httpParameters);
　　HttpPost httpPost = new HttpPost(url);
   // 添加http头信息
　　httpPost.addHeader("Content-Type", "application/json");
　　httpPost.addHeader("User-Agent", "imgfornote");
　　httpPost.setEntity(new StringEntity(json,"UTF-8"));
　　HttpResponse httpResponse = httpClient.execute(httpPost);
　　int statusCode = httpResponse.getStatusLine().getStatusCode();
　　if (statusCode == HttpStatus.SC_OK) {
    　　response = EntityUtils.toString(httpResponse.getEntity());
　　} else {
    　　response = String.valueOf(statusCode);
　　}
　　return response;
}

[OperationContract]
[WebInvoke(UriTemplate = "/yyxTest", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json)]
string MensarTest(XCJCQK model);