如何使用 Multipart 在 retrofit2 中发送整数列表和图像

Question

我正在尝试使用 retrofit 2.0 上传图像。我几乎没有其他参数可以与包含整数列表的表单数据一起发送。我的请求声明是

@Multipart
@POST("/api/Add")
    Call<AddResponse> addApi(@Part("Id") RequestBody id,
                             @Part("Name") RequestBody name,
                             @Part("Description") RequestBody description,
                             @Part("Phone") RequestBody phone,
                             @Part MultipartBody.Part logo,
                             @Part("WorkingDays") RequestBody workingDays,
                             @Part("CitiesIDs") RequestBody cities);

public class RetrofitService {

    private static Retrofit retrofit;
    private static final Object LOCK = new Object();
    private static final String BASE_URL = "https://baseurl.app";

    public static Retrofit getRetrofitInstance() {

        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.addInterceptor(chain -> {
            Request original = chain.request();

            Request.Builder requestBuilder = original.newBuilder()
           .addHeader("Content-Type", "application/json");

            Request request = requestBuilder.build();
            return chain.proceed(request);
        });

        OkHttpClient client = httpClient.build();

        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
        logging.setLevel(HttpLoggingInterceptor.Level.BODY);
        httpClient.addInterceptor(logging);
        httpClient.readTimeout(60, TimeUnit.SECONDS);
        httpClient.connectTimeout(60, TimeUnit.SECONDS);
        if (retrofit == null) {
            synchronized (LOCK) {
                retrofit = new retrofit2.Retrofit.Builder()
                        .baseUrl(BASE_URL)
                        .client(client)
                        .addConverterFactory(ScalarsConverterFactory.create())
                        .addConverterFactory(GsonConverterFactory.create())
                        .client(httpClient.build())
                        .build();
            }
        }

        return retrofit;
    }

这种方式无法按预期工作，整数列表如下所示单独发送。

Content-Disposition: form-data; name="CitiesIDs"
Content-Transfer-Encoding: binary
Content-Type: multipart/form-data; boundary=290d2964-526a-48b9-b742-c6a3b547c7d6
Content-Length: 286
--290d2964-526a-48b9-b742-c6a3b547c7d6
Content-Disposition: form-data; name="CitiesIDs"
Content-Length: 1
7
--290d2964-526a-48b9-b742-c6a3b547c7d6
Content-Disposition: form-data; name="CitiesIDs"
Content-Length: 1
8
--290d2964-526a-48b9-b742-c6a3b547c7d6--

此外，为了将整数列表转换为 RequestBody，我使用以下方式

okhttp3.MultipartBody.Builder citiesRequestBodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);

  for(int i=0; i<citiesIdList.size(); ++i){
  citiesRequestBodyBuilder.addFormDataPart("CitiesIDs", String.valueOf(citiesIdList.get(i)));
   }

由于添加表单数据部分方法 addFormDataPart 只接受字符串，所以我不得不将整数转换为字符串，这使得服务器响应以下消息

 {"Success":false,
  "ErrorMessage":"Input string '--290d2964-526a-48b9-b742-c6a3b547c7d6' is not a valid number. Path '', line 1, position 38.",
 "Id":0}

邮递员，工作正常那么我如何使用 Multipart 发送图像和整数列表。

问题是 RequestBody 只接受 File, byte[], String, ByteString 如何发送带有 @part.

的整数列表

感谢您的帮助。

Answer 1

您必须仅对文件使用 MultipartBody.Part，其他字段应与 RequestBody 一起使用。

删除下面的代码

for(int i=0; i<citiesIdList.size(); ++i){
  citiesRequestBodyBuilder.addFormDataPart("CitiesIDs", String.valueOf(citiesIdList.get(i)));
   }

使用

 // Add other field here
RequestBody description =
            RequestBody.create(
                    okhttp3.MultipartBody.FORM, Gson().toJson(citiesIdList));

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