Retrofit2響應主體為null

Question

我構建了Retrofit2以從https獲取請求，我還構建了具有OKHttpClient的日志攔截器，日志顯示了來自http get的正確結果，但是Retrofit的response.body（）為空，我該如何解決該問題？

 HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() { @Override public void log(String message) { //打印retrofit日志Log.i("RetrofitLog","retrofitBack = "+message); } }); loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY); OkHttpClient client = new OkHttpClient.Builder() .addInterceptor(loggingInterceptor) .build(); Retrofit retrofit = new Retrofit.Builder().client(client).baseUrl(Constant.baseURL).addConverterFactory(GsonConverterFactory.create()).build(); BannerService bannerService = retrofit.create(BannerService.class); Call<JSONObject> bannerResult = bannerService.getBannerList(5); bannerResult.enqueue(new Callback<JSONObject>() { @Override public void onResponse(Call<JSONObject> call, Response<JSONObject> response) { if (response.isSuccessful()) { System.out.println("----------------------\\t"+response.body()); } else { // error response, no access to resource? } } @Override public void onFailure(Call<JSONObject> call, Throwable t) { } }); 

最終的攔截器日志結果如下：

> 
I/RetrofitLog: retrofitBack = Content-Type: application/json;charset=UTF-8
I/RetrofitLog: retrofitBack = Content-Length: 1515
               retrofitBack = Connection: keep-alive
               retrofitBack = Cache-Control: must-revalidate, no-store
               retrofitBack = Last-Modified: Fri, 15 Jun 2018 03:00:00 GMT
               retrofitBack = Pragma: no-cache
               retrofitBack = X-XSS-Protection: 1; mode=block
               retrofitBack = X-Frame-Options: DENY
               retrofitBack = X-Content-Type-Options: nosniff
               retrofitBack = X-Daa-Tunnel: hop_count=2
               retrofitBack = X-NWS-LOG-UUID: 0756741f-5bc5-44ba-9b3e-82dd08ae6f95
               retrofitBack = X-Cache-Lookup: Hit From Upstream
........
> 
> ----------------//here is the correct out------------------
>
>
> I/RetrofitLog: retrofitBack = {"resultModel":[{"banner_id":3,"banner_title":"拾光cafe","banner_description":"合肥工業大學校內的咖啡廳，方便實惠","banner_image_name":"84c61eca-ac3c-4fa3-8146-43cce52aebc3.jpg","banner_create_time":"2018-05-31 12:54:47","banner_creater_id":1000000,"banner_href":"1000000807","enabled":1},{"banner_id":100003,"banner_title":"合肥悅方IDMall · 永輝超市","banner_description":"一個永遠都有試吃的超市","banner_image_name":"fe154125-3752-4842-907d-203e45ae51ad.jpg","banner_create_time":"2018-03-26 16:33:45","banner_creater_id":100000000,"banner_href":"http","enabled":1},{"banner_id":100002,"banner_title":"斛兵塘","banner_description":"距今已有一千七百多年歷史的一個水塘","banner_image_name":"b4f1281c-e43d-4a69-903f-5e1eb3505938.jpg","banner_create_time":"2018-03-26 16:13:13","banner_creater_id":100000000,"banner_href":"http","enabled":1},{"banner_id":100001,"banner_title":"合肥天鵝湖","banner_description":"一個形狀神似天鵝的人工湖","banner_image_name":"1c796d8d-b868-4590-ae0e-d0599ad462cf.jpg","banner_create_time":"2018-03-26 16:10:32","banner_creater_id":100000000,"banner_href":"http","enabled":1},{"banner_id":100000,"banner_title":"合肥工業大學","banner_description":"一個食堂上央視的高校","banner_image_name":"92361818-2daf-45db-9294-d36241fd243b.jpg","banner_create_time":"2018-03-22 10:05:21","banner_creater_id":1000000,"banner_href":"1000000241","enabled":1}],"resultCode":200,"resultMessage":"請求成功"}   
> 
> 
>> ----------------//here is the correct out------------------ 
>
>
> .........
>
>
>
I/System.out: ----------------------    {}   //here is my system.out is empty
>
>
>
> I/Choreographer: Skipped 253 frames!  The application may be doing too much work on its main thread.

Answer 1

您正在混淆概念。 首先，您要傳遞一個GsonConverter：

 Retrofit retrofit = new Retrofit.Builder().client(client).baseUrl(Constant.baseURL).addConverterFactory(GsonConverterFactory.create()).build();

但是，然后您期望一個JSONObject：

 Call<JSONObject> bannerResult = bannerService.getBannerList(5);

通過GsonConverter時，翻新將轉換為Gson，而不是JSONObject。 這意味着您應該使用適當的Gson注釋聲明自己的Java pojo。 例：

import com.google.gson.annotations.Expose;

public class Banner {

    @Expose
    public String oneField

    @Expose
    public String otherField;

}

如您所期望的那樣，您可以更改BannerService：

public interface BannerService {

    @GET("/your/path/to/get/banner/list")
    Call<List<Banner>> getBannerList(@Path("id") int id);

}

最后更改您的行以接收列表...

 Call<List<Banner>> bannerResult = bannerService.getBannerList(5);

並替換您的Callback實例化和方法，以在期望JSONObject的位置接收List。