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嗨，我无法使用改造 2.0.0-beta2 上传图像。它给了我“图像丢失”错误。尽管我检查了该文件是否存在于系统中，并且如果我在图像视图中显示它也可以正确显示。

需要上传的 URL：http: //mywebsite.com/signature/upload/

所以我的 BASE_URL 是 = http://mywebsite.com/

我的.gradle文件有这个：

compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'
compile 'com.squareup.okhttp:logging-interceptor:2.6.0'

SeriveGenerator.java类是

public class ServiceGenerator {

public static final String API_BASE_URL = Urls.URL_BASE;

private static OkHttpClient httpClient = new OkHttpClient();



private static Retrofit.Builder builder =
        new Retrofit.Builder()
                .baseUrl(API_BASE_URL)
                .addConverterFactory(GsonConverterFactory.create());

public static <S> S createService(Class<S> serviceClass) {
    Retrofit retrofit = builder.client(httpClient).build();
    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    httpClient.interceptors().add(interceptor);
    return retrofit.create(serviceClass);
}

}

UploadService.java类是

public interface UploadService {
@Multipart
@POST("/signature/upload/")  
// Tried to change this to "/signature/upload" as well (no slash in end)
// then gives Method not allowed error"
Call<String> upload(
        @Part("image") RequestBody file,
        @Part("image_name") String name);
}

最后在我的 android 活动中

// photoFile is the file, checked that it exist in system and 
// path is also correct

public void uploadFileToServer() {
    UploadService service =
            ServiceGenerator.createService(UploadService.class);

    String name = "xyz.jpg";

    RequestBody requestBody =
            RequestBody.create(MediaType.parse("multipart/form-data"), photoFile);

    Call<String> call = service.upload(requestBody, name);
    call.enqueue(new Callback<String>() {
        @Override
        public void onResponse(Response<String> response, Retrofit retrofit) {

            Log.v("Upload", "success");
        }

        @Override
        public void onFailure(Throwable t) {
            Log.e("Upload", t.getMessage());
        }
    });
}

所以我从活动中获得成功日志“成功”，但服务器文件不存在，使用邮递员，我尝试手动上传表单数据中的图像，正确上传。

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1 回答 1

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几天前我遇到了类似的问题。这是我的工作代码。

首先，您必须定义接口。不添加内容类型标头非常重要。在下面，您会看到@Part("picture\";“图片”是后端期望的相应名称（在我的情况下）。因此，您必须更改此名称以使其与您的后端一起使用。filename=\"image\" 只是定义了您上传的图像的名称。就我而言，该方法位于“DiaryService.java”中。

    @Multipart
    @POST("signature/upload")
    public Call<Void> addImageElementToDiary(@Part("picture\"; filename=\"image\" ") RequestBody picture,
                                             @Part("sort") RequestBody sort);

现在你可以调用上面定义的Service了。正确解析 Mediatype 很重要。您使用了“multipart/form-data”，这在我的情况下不起作用。您应该查看以下 Mediatypes。

    File file = new File(((CreateDiaryImage) element).getImagePath());

        RequestBody sort = RequestBody.create(MediaType.parse("text/plain"), element.getSort() + "");

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

        Call<Void> call = diaryService.addImageElementToDiary(requestBody, sort);
        call.enqueue(new Callback<Void>() {
            @Override
            public void onResponse(Response<Void> response, Retrofit retrofit) {
                Log.v("Upload", "success");
            }

            @Override
            public void onFailure(Throwable t) {
                Log.e("Upload", t.getMessage());
            }
        });
于 2016-01-23T16:23:26.373 回答