使用Okhttp在多部分POST中传递数组

Question

我正在构建一个应用程序，需要一个API调用，在其POST body请求中有数组。我正在使用OkHttp 2.6请求API。

Postman中的请求如下所示：

为了实现这一点，我尝试了几种编写RequestBody的方法，

RequestBody requestBody = new MultipartBuilder()
        .type(MultipartBuilder.FORM)
        .addFormDataPart("app_token", MY_TOKEN)
        .addFormDataPart("user_id", 377)
        .addFormDataPart("group_id", String.valueOf(groupId))
        .addFormDataPart("key_id", deals.toString())
        .addFormDataPart("img", filename + ".jpg", fileBody)
        .build();

RequestBody requestBody = new MultipartBuilder()
        .type(MultipartBuilder.FORM)
        .addFormDataPart("app_token", MY_TOKEN)
        .addFormDataPart("user_id", 377)
        .addFormDataPart("group_id", String.valueOf(groupId))
        .addFormDataPart("key_id[0]", "33")
        .addFormDataPart("key_id[1]", "34")
        .addFormDataPart("img[0]", filename + ".jpg", fileBody)
        .build();

MediaType json = MediaType.parse("application/json; charset=utf-8");
Map<String, Integer> params = new HashMap<>();
for (int i = 0; i < deals.size(); i++) {
    params.put("key_id["+i+"]", Integer.valueOf(deals.get(i).getUid()));
}
JSONObject parameter = new JSONObject(params);
RequestBody theBody = RequestBody.create(json, parameter.toString());


RequestBody requestBodyyy = new MultipartBuilder()
        .type(MultipartBuilder.FORM)
        .addFormDataPart("app_token", MY_TOKEN)
        .addFormDataPart("user_id", 377)
        .addFormDataPart("group_id", String.valueOf(groupId))
        .addPart(theBody)
        .addFormDataPart("img[0]", filename + ".jpg", fileBody)
        .build();

Answer 1

嗯，解决办法似乎很容易。我已经设法解决了这个问题，所以我无论如何都要在这里写给寻求同样解决方案的人。

MultipartBuilder multipartBuilder = new MultipartBuilder()
        .type(MultipartBuilder.FORM)
        .addFormDataPart("token", MY_TOKEN)
        .addFormDataPart("user_id", user_id)
        .addFormDataPart("group_id", group_id)
        // .addFormDataPart("img[0]", filename + ".jpg", RequestBody.create(MediaType.parse("image/png"), file));

for (int i = 0; i < keys.size(); i++) {
    multipartBuilder.addFormDataPart("key_id[" + i + "]", keys.get(i));
}

for (int i = 0; i < files.size(); i++) {
    filename = Utils.getSimpleTimestamp();
    multipartBuilder.addFormDataPart("img[" + i + "]", filename + ".jpg", RequestBody.create(MediaType.parse("image/png"), files.get(i)));
}

RequestBody requestBody = multipartBuilder.build();
Request request = new Request.Builder()
        .url(API_URL)
        .post(requestBody)
        .addHeader("content-type", "multipart/form-data;")
        .build();

OkHttpClient okHttpClient = new OkHttpClient();