xUtils怎么post请求上传json数据

public class UtilsPost {

public static void doPost(String url, RequestParams params, final Handler handler) {

HttpUtils http = new HttpUtils();

http.configCurrentHttpCacheExpiry(1000 * 10);

http.send(HttpMethod.POST, url, params, new RequestCallBack() {

@Override

public void onFailure(HttpException arg0, String arg1) {

// TODO Auto-generated method stub

}

@Override

public void onSuccess(ResponseInfo info) {

// TODO Auto-generated method stub

String data = info.result;//这里是返回值

Message message = new Message();

message.obj = data;

handler.sendMessage(message);

}

});

}

}