xUtils怎么post请求上传json数据

 ???????InfoSmallCodeBinding smallCode = new InfoSmallCodeBinding(); ???????smallCode.setSmallCode("测试"); ???????smallCode.setMiddleBoxCode("测试"); ???????smallCode.setProductCode("0001"); ???????Gson gson3 = new Gson(); ???????String url = AppConfig.ApiUrl+"?action=smallcodebindingadd"; ???????HttpUtils httpUtils = new HttpUtils(); ???????//Log.d("Http2635", "test: "+gson3.toJson(smallCode)); ???????RequestParams params = new RequestParams(); ???????params.setBodyEntity(new StringEntity(gson3.toJson(smallCode),"UTF-8")); ???????params.setContentType("application/json"); ???????httpUtils.send(com.lidroid.xutils.http.client.HttpRequest.HttpMethod.POST, url, params, new RequestCallBack<String>() { ???????????????????@Override ???????????????????public void onSuccess(ResponseInfo<String> responseInfo) { ???????????????????????Log.d("Http2635", "onSuccess: "+responseInfo.result.toString()); ???????????????????} ???????????????????@Override ???????????????????public void onFailure(HttpException e, String s) { ???????????????????????Log.d("Http2635", "onFailure: "+e.toString()); ???????????????????} ???????????????} ???????);