在服务器上找不到 Google App Engine blobstore createUploadUrl 404

Question

我正在使用 blobstore API 将图像上传到我的应用程序。这在本地可以正常工作，这意味着图像已成功上传并且回调也可以正常工作。但是当我从服务器向 createUploadUrl 返回的上传 URL 发送多部分请求时，它总是给我 404 not found 错误。 是否有可能没有为我的应用启用 blobstore？为什么我在谷歌云控制台中看不到我的 blobstore？我必须到这里https://appengine.google.com/blobstore/ 才能看到我的 blob。

应用端的代码：doPost 处理回调，doGet 返回uploadUrl（都在同一个servlet /_ah/admin/new_image 中）。 doPost（回调处理程序代码）永远不会触发，也不会上传图像。

@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
          throws IOException {

    Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(req);
    List<BlobKey> blobKeys = blobs.get("image");
    ImagesService imagesService = ImagesServiceFactory.getImagesService();
    String imageUrl = imagesService.getServingUrl(ServingUrlOptions.Builder.withBlobKey(blobKeys.get(0)));
    Long businessId = Long.parseLong(req.getParameter("business_id"));
    String linkUrl = req.getParameter("link_url");
    Long id = Long.parseLong(req.getParameter("advertisement_id"));
    AdvertisementManager.addNewAdvertisement(id, imageUrl, linkUrl, businessId);
}

@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
          throws IOException {

    PrintWriter out = resp.getWriter();
    resp.setContentType( "text/html" ); 
    String uploadUrl = blobstoreService.createUploadUrl("");
    Logger.getLogger("").log(Level.WARNING,uploadUrl);
    out.print(uploadUrl);
}

上传图片的代码：先发送get请求获取上传url，再发送multipart请求和图片文件

public static void upload(Long id, File file, String linkUrl, Long businessId){
    HttpClient httpclientget = HttpClientBuilder.create().build();
    HttpGet httpget = new HttpGet("http://app-url/_ah/admin/new_image"); 

    String uploadUrl = "";

    try {
        HttpResponse responseGet = httpclientget.execute(httpget);
        uploadUrl = EntityUtils.toString(responseGet.getEntity());
        Logger.getLogger("").log(Level.WARNING,uploadUrl);
    } catch (Exception e) {
        e.printStackTrace();
    }       
    HttpClient httpclient = HttpClientBuilder.create().build();
    HttpPost httpPost = null;
    String uri=null;

    try {
        URIBuilder builder = new URIBuilder(uploadUrl);
        builder.setParameter("advertisement_id", id.toString());
        builder.setParameter("link_url", linkUrl);
        builder.setParameter("business_id", businessId.toString());
        uri=builder.build().toString();
    } catch (URISyntaxException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    httpPost = new HttpPost(uri);
    System.out.println(uri);
    if (file!=null){
        MultipartEntityBuilder reqEntity = MultipartEntityBuilder.create();
        reqEntity.addBinaryBody("image", file, ContentType.create("image/jpeg"), "ad.jpg");

        httpPost.setEntity(reqEntity.build());
    }
    try {
        HttpResponse response = httpclient.execute(httpPost);
        System.out.println(response);
    } catch (Exception e){
        System.out.println(e.getMessage());
        e.printStackTrace();
    }
}

Answer 1

AFAIK /_ah/* 空间是为内部 GAE 服务保留的，您不应该使用它。您收到 404 的原因可能是 Google 阻止您部署该 servlet，请尝试更改 URL。