android - 无法使用 Retrofit 2 上传图像

Question

我无法从 Retrofit 2 上传图片，请查看我下面的代码

@Multipart
@POST("upload-image")
Call<UploadImageResponse> uploadFile(@Part MultipartBody.Part file, @Part("file") RequestBody name);

我调用的函数就是这样执行的，

// Uploading Image
public void uploadFile()
{
    // Map is used to multipart the file using okhttp3.RequestBody
    File file = new File(sellerActivity.mediaPath);

    // Parsing any Media type file
    RequestBody requestBody = RequestBody.create(MediaType.parse("image/*"), file);

    MultipartBody.Part fileToUpload = MultipartBody.Part.createFormData("file", file.getName(), requestBody);

    RequestBody filename = RequestBody.create(MediaType.parse("text/plain"), file.getName());

    Call<UploadImageResponse> call = apiService.uploadFile(fileToUpload, filename);

    call.enqueue(new Callback<UploadImageResponse>() {
        @Override
        public void onResponse(Call<UploadImageResponse> call, Response<UploadImageResponse> response) {
            if (response.isSuccessful())
            {
                System.out.println("Image Url: " + response.body().getImage() + " " + response.body().getDishesName());
                System.out.println("Image Message: " + response.raw());
            }
            else
            {
                System.out.println("Image Message: " + response.raw());
            }
        }

        @Override
        public void onFailure(Call<UploadImageResponse> call, Throwable t) {
            System.out.println("onFailure: " + t);
        }
    });
}

当我使用 postman 时，我会这样做

我搜索并尝试了各种方法，但都没有成功。任何帮助将不胜感激。

Answer 1

你一定对multipart form数据有一个清晰的认识，所以阅读this link还有许多其他可用的。

答案是更改您的端点方法，如下所示:

@Multipart
@POST("upload-image")
Call<UploadImageResponse> uploadFile(@Part MultipartBody.Part file, @Part("dishes_name") RequestBody name);

您缺少为每个部分分配适当的键。

此外，将实现更改如下:

// Uploading Image
public void uploadFile()
{
    // Map is used to multipart the file using okhttp3.RequestBody
    File file = new File(sellerActivity.mediaPath);

    // Parsing any Media type file
    RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);

    MultipartBody.Part fileToUpload = MultipartBody.Part.createFormData("image", file.getName(), requestBody);

    RequestBody filename = RequestBody.create(MediaType.parse("text/plain"), file.getName());

    Call<UploadImageResponse> call = apiService.uploadFile(fileToUpload, filename);

    call.enqueue(new Callback<UploadImageResponse>() {
        @Override
        public void onResponse(Call<UploadImageResponse> call, Response<UploadImageResponse> response) {
            if (response.isSuccessful())
            {
                System.out.println("Image Url: " + response.body().getImage() + " " + response.body().getDishesName());
                System.out.println("Image Message: " + response.raw());
            }
            else
            {
                System.out.println("Image Message: " + response.raw());
            }
        }

        @Override
        public void onFailure(Call<UploadImageResponse> call, Throwable t) {
            System.out.println("onFailure: " + t);
        }
    });
}

MultipartBody.Part.createFormData(keyName, fileName, requestBody)方法中第一个参数是多部分文件的键名，第二个参数是文件名，第三个参数是请求这部分的正文。 link .

希望对您有所帮助。