android retrofit 2上传图片到服务器

implementation 'com.squareup.retrofit2:retrofit:2.x.x'
implementation 'com.squareup.retrofit2:converter-gson:2.x.x'
implementation 'com.squareup.okhttp3:okhttp:4.x.x'

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

OkHttpClient client = new OkHttpClient.Builder().build();

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://your-server-url.com/")
        .client(client)
        .addConverterFactory(GsonConverterFactory.create())
        .build();

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

File file = new File("path_to_your_image_file");
RequestBody requestBody = RequestBody.create(MediaType.parse("image/*"), file);
MultipartBody.Part imagePart = MultipartBody.Part.createFormData("image", file.getName(), requestBody);

Call<ResponseBody> call = apiService.uploadImage(imagePart);
call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        // 处理上传成功的响应
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理上传失败的响应
    }
});