使用Retrofit2将文件上传到AWS S3预签名URL

在同事的帮助下，这就是解决方案。

public interface UpdateImageInterface {    @PUT    Call<Void> updateImage(@Url String url, @Body RequestBody image);}

调用代码：

    String CONTENT_IMAGE = "image/jpeg";    File file = new File(localPhotoPath);    // create new file on device    RequestBody requestFile = RequestBody.create(MediaType.parse(CONTENT_IMAGE), file);        Retrofit retrofit = new Retrofit.Builder()        .baseUrl("http://www.dummy.com/")        .build();    UpdateImageInterface imageInterface = retrofit.create(UpdateImageInterface.class);    // imageUrl is the String as received from AWS S3    Call<Void> call = imageInterface.updateImage(imageUrl, requestFile);

Javadoc，获取有关

@Url

baseUrl()

MediaType