在Retrofit中将表单数据发送到服务器

尝试通过 Retrofit 向服务器发送表单数据，但无法向服务器请求。我想发布带有他们的数据的图像数组。

val builder: MultipartBody.Builder = MultipartBody.Builder().setType(MultipartBody.FORM);
builder.addFormDataPart("device_id",device_UDID)
builder.addFormDataPart("device_token",device_token)
builder.addFormDataPart("device_type","android")
builder.addFormDataPart("country_code",Constant.COUNTRY_CODE)
builder.addFormDataPart("email",signUpBean.email)
builder.addFormDataPart("mobile",signUpBean.phoneNumber)
builder.addFormDataPart("first_name",signUpBean.firstName)
builder.addFormDataPart("last_name",signUpBean.lastName)
builder.addFormDataPart("gender",signUpBean.gender)
builder.addFormDataPart("dob",signUpBean.dob)
builder.addFormDataPart("city",signUpBean.city)
builder.addFormDataPart("bike_type_id","1")
builder.addFormDataPart("bike_model",signUpBean.mfg)
builder.addFormDataPart("bike_manufacturer",signUpBean.mfg)
builder.addFormDataPart("reg_year",signUpBean.mfgYear)
builder.addFormDataPart("liecense_plate",signUpBean.licencePlateNo)
builder.addFormDataPart("bank_ac_name",signUpBean.bnkHolderName)
builder.addFormDataPart("bank_ac_number",signUpBean.bnkAccountNumber)
builder.addFormDataPart("bank_name",signUpBean.bnkName)
builder.addFormDataPart("bank_ifsc_code",signUpBean.ifscCode)
builder.addFormDataPart(
    "profile_pic",
    "profile" + ".jpg",
    RequestBody.create(MediaType.parse("image/*"), file_profile!!)
)
builder.addFormDataPart(
    "provider_documents[0][document]",
    "1" + ".jpg",
    RequestBody.create(MediaType.parse("image/*"), file_profile!!)
)
builder.addFormDataPart("provider_documents[0][document_id]","1")
builder.addFormDataPart("provider_documents[0][unique_id]","1")
builder.addFormDataPart("provider_documents[0][exprice_at]","2010-12-12")
val requestBody = builder.build()
observable = apiInterface.signUp2(requestBody)

我尝试了很多解决方案，但无法发布带有数据的图像数组。 当我删除时provider_documents from addFormDataPart效果很好。

// @Multipart
@POST(URLHelper.register)
fun signUp2(@Body builder: RequestBody ): Observable<Registration>

我怎样才能发送Providers_document数组并且它运行良好Postman.

post this type of data from retrofit

val partMap = HashMap<String, RequestBody>()
partMap.put("device_id", createPartFromString(device_UDID));
partMap.put("device_token",createPartFromString(device_token))
partMap.put("device_type",createPartFromString("android"))
partMap.put("country_code",createPartFromString(Constant.COUNTRY_CODE))
partMap.put("email",createPartFromString(signUpBean.email))
partMap.put("mobile",createPartFromString(signUpBean.phoneNumber))
partMap.put("first_name",createPartFromString(signUpBean.firstName))
partMap.put("last_name",createPartFromString(signUpBean.lastName))
partMap.put("gender",createPartFromString(signUpBean.gender))
partMap.put("dob",createPartFromString(signUpBean.dob))
partMap.put("city",createPartFromString(signUpBean.city))
partMap.put("bike_type_id",createPartFromString("1"))
partMap.put("bike_model",createPartFromString(signUpBean.mfg))
partMap.put("bike_manufacturer",createPartFromString(signUpBean.mfg))
partMap.put("reg_year",createPartFromString(signUpBean.mfgYear))
partMap.put("liecense_plate",createPartFromString(signUpBean.licencePlateNo))
partMap.put("bank_ac_name",createPartFromString(signUpBean.bnkHolderName))
partMap.put("bank_ac_number",createPartFromString(signUpBean.bnkAccountNumber))
partMap.put("bank_name",createPartFromString(signUpBean.bnkName))
partMap.put("bank_ifsc_code",createPartFromString(signUpBean.ifscCode))

partMap.put(
    "provider_documents["+0+"][document_id]",
    createPartFromString(signUpBean.ifscCode)
)
partMap.put(
    "provider_documents["+0+"][unique_id]",
    createPartFromString(signUpBean.ifscCode)
)
partMap.put(
    "provider_documents["+0+"][exprice_at]",createPartFromString(signUpBean.dob)
)
    
val ImageMap = HashMap<String, MultipartBody.Part>()
ImageMap.put("profile_pic", prepareFilePart("12", file_profile!!));
ImageMap.put("provider_documents["+0+"][document]", prepareFilePart("1", file_profile!!));

请求API

@Multipart
@POST(URLHelper.register)
fun signUp3(
    @PartMap photo: HashMap<String,
    RequestBody>,
    @PartMap ImageMap:HashMap<MultipartBody.Part>,
): Observable<Registration>

虚拟 api 接口。

 public interface ApiInterface {
        @Multipart
        @POST(URLHelper.register)
        Call<ModelProp> signUp2(@Part List<MultipartBody.Part> photos,
                          @PartMap Map<String, RequestBody> map;
    }

现在创建要发布的数据，如下所示。

Map<String, RequestBody> partMap = new HashMap<>();
List<MultipartBody.Part> images = new ArrayList<>();
partMap.put("device_id", createPartFromString(deviceId)); // add data which are common for all images like device_id, device_token, device_type etc.
..
..

for (int i=0; i < upFileList.size(); i++){
   images.add(prepareFilePart("provider_documents["+i+"][document]", imageFile));
   partMap.add("provider_documents["+i+"][expires_at]", createPartFromString(expiry)); // add image specific data. 
 ...
 ..
}
...
..
observable = apiInterface.signUp2(images, partMap).

从字符串创建零件 method

public RequestBody createPartFromString(String string) {
        return RequestBody.create(MultipartBody.FORM, string);
}

准备文件部分 method

private MultipartBody.Part prepareFilePart(String partName, File file){
    RequestBody requestBody = RequestBody.create(MediaType.parse("image/*"), file);

    return MultipartBody.Part.createFormData(partName, file.getName(),requestBody);
}