java - 无法以多部分形式发布图像

Question

我正在尝试将 camfind 用于 Android 应用程序，并对所有请求使用 Retrofit 等。我发现使用多部分表单数据将图像文件上传到服务器非常困难。你能解决这个问题吗？

我的代码:

public class getCamFind {
//Set constants
private static final String TAG = MainActivity.class.getSimpleName();
private static final String API_URL = "https://camfind.p.mashape.com";

//creates object getCamFind, sends request and gets answer
static void getCamResult(String path) throws IOException {

    File imageFile = new File(path); //THIS FILE EXISTS AND SD IS MOUNTED


    String language = new String("en_US");
    String keyMashape = "XXX";


    RestAdapter restAdapter = new RestAdapter.Builder()
            .setEndpoint(API_URL)
            .setLogLevel(RestAdapter.LogLevel.FULL)
            //.setRequestInterceptor(new SessionRequestInterceptor())
            .build();



    // Create an instance of our API interface.
    CamFind camFind = restAdapter.create(CamFind.class);

    camFind.send(keyMashape, language, new TypedFile("image/jpeg", imageFile), new Callback<resultClass>() {
        @Override
        public void success(resultClass result, Response response) {
            Log.d(TAG, response.toString());
            Log.d(TAG, result.getStatus());
            Log.d(TAG, response.getBody().toString());
        }

        @Override
        public void failure(RetrofitError retrofitError) {
            Log.d(TAG, "Error : " + retrofitError.getMessage());
        }
    });
}

static class Contributor {
    String login;
    int contributions;
}


//interface of the object getCamFind
interface CamFind {

    @Multipart
    @POST("/image_requests")

    void send(
            @Header("X-Mashape-Key") String keyMashape,
            @Part("image_request[locale]") String language,
            @Part("image_request[image]") TypedFile imageFile,

            //@Field("image_request[remote_image_url]") String URL,
            Callback<resultClass> callback);

}

private class resultClass{
    String name;
    String status;

    public String getName(){return this.name;}
    public String getStatus(){return this.status;}


}


}

当我以这种方式发送它时，它会显示 "{"error": {"image": ["invalid image format"]}}" 当我使用文件而不是键入的文件发送它时，它说“image”:[“不能为空”]。

这可能有用，它是我使用 cloudsight 的 POST 的改造日志(与使用 mashape 基本相同，请求相同):

        06-29 16:59:43.866    2483-2502/bookshotco.bookshot2 D/Retrofit﹕ ---> HTTP POST https://api.cloudsightapi.com/image_requests
    06-29 16:59:43.866    2483-2502/bookshotco.bookshot2 D/Retrofit﹕ Authorization: CloudSight XXX
    06-29 16:59:43.866    2483-2502/bookshotco.bookshot2 D/Retrofit﹕ Content-Type: multipart/form-data; boundary=ac3731a5-466f-4baf-87d1-b21fddc41701
    06-29 16:59:43.866    2483-2502/bookshotco.bookshot2 D/Retrofit﹕ Content-Length: 531
    06-29 16:59:43.879    2483-2502/bookshotco.bookshot2 D/Retrofit﹕ --ac3731a5-466f-4baf-87d1-b21fddc41701
    Content-Disposition: form-data; name="image_request[locale]"
    Content-Type: text/plain; charset=UTF-8
    Content-Length: 5
    Content-Transfer-Encoding: binary
    en_US
    --ac3731a5-466f-4baf-87d1-b21fddc41701
    Content-Disposition: form-data; name="image_request[image]"; filename="JPEG_20150627_231626_1086927409.jpg"
    Content-Type: image/jpeg
    Content-Length: 0
    Content-Transfer-Encoding: binary
    --ac3731a5-466f-4baf-87d1-b21fddc41701--
    06-29 16:59:43.880    2483-2502/bookshotco.bookshot2 D/Retrofit﹕ ---> END HTTP (531-byte body)

这可能也有用(查看“image_requests”部分):http://cloudsight.readme.io/v1.0/docs/testinput

Answer 1

正如您在 documentation of retrofit 中看到的那样，构造函数的第一个参数不是文件的路径。

TypedFile(String mimeType, File file)
Constructs a new typed file.

这是 mimetype。尝试一下

new TypedFile("image/png", imageFile) 

或

new TypedFile("image/jpeg", imageFile)