如何用retrofit2发送文件分块正文？

implementation 'com.squareup.retrofit2:retrofit:2.x.x'

public interface ApiService {
    @Multipart
    @POST("upload")
    Call<ResponseBody> uploadFile(@Part MultipartBody.Part file);
}

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://example.com/") // 替换为你的API地址
        .build();

ApiService apiService = retrofit.create(ApiService.class);

File file = new File("path/to/file");
RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), requestBody);

Call<ResponseBody> call = apiService.uploadFile(filePart);

call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        if (response.isSuccessful()) {
            // 处理成功响应
        } else {
            // 处理失败响应
        }
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理请求失败
    }
});