使用 HTTP 方法从 blobstore 中检索 blob 密钥

Question

我一直在参考这个帖子Store image to Blobstore from android client and retrieve blobkey and upload url to store in Datastore. - GAE。下面的最后两个代码块可能是最相关的，因为它们是在应用引擎和我的 android 应用之间发送和接收 blob 密钥的代码。

blob 正在上传。 当我让我的 servlet 返回 blob 密钥时，我会继续在我的日志中得到这个：

405 HTTP method POST is not supported by this URL

这是我在应用引擎上的 BlobUrlGet.java，它提供了一个用于上传 blob 的 URL：

public class BlobUrlGet extends HttpServlet {


BlobstoreService blServ =    BlobstoreServiceFactory.getBlobstoreService();

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


    UploadOptions uploadOptions = UploadOptions.Builder.withGoogleStorageBucketName("abc123-974.appspot.com");
    String blobUploadUrl = blServ.createUploadUrl("/Uploaded", uploadOptions);




    resp.setStatus(HttpServletResponse.SC_OK);
    resp.setContentType("text/plain");

    PrintWriter out = resp.getWriter();
    out.print(blobUploadUrl);
}

}

然后我在我的 android 应用程序中使用此代码上传文件，然后监听 blob 键：

private class GetBlobUrlTask extends AsyncTask<Void, Void, Void> {
    HttpResponse response = null;

    protected Void doInBackground(Void... arg0){  
HttpClient httpClient = new DefaultHttpClient();  

HttpGet httpGet = new HttpGet("http://abc123-974.appspot.com/bloburlget"); 


        response = httpClient.execute(httpGet);


HttpEntity urlEntity = response.getEntity();
InputStream in = null;
        in = urlEntity.getContent();


}
String str = ""; 
StringWriter writer = new StringWriter();
String encoding = "UTF-8";


    IOUtils.copy(in, writer, encoding);

str = writer.toString();



@SuppressWarnings("deprecation")
HttpPost httppost = new HttpPost(str);

File f2 = new File(Environment.getExternalStorageDirectory()
        + "/ContactDetail.json");
FileBody fileBody = new FileBody(f2);


MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("file", fileBody);
httppost.setEntity(reqEntity);

    response = httpClient.execute(httppost);




String str2 = "";

str2 = EntityUtils.toString(response.getEntity());

//Getting that Post is not supported method when I print the following string:
blobKeyString = str2;

最后我的 Uploaded.java 应该返回 blob 键，但它不是：

public class Uploaded extends HttpServlet {


private static final long serialVersionUID = 1L;
BlobstoreService blobstoreService = BlobstoreServiceFactory
        .getBlobstoreService();

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

            List<BlobKey> blobs = blobstoreService.getUploads(req).get("file");

            BlobKey blobKey = blobs.get(0);

            resp.setStatus(HttpServletResponse.SC_OK);
            resp.setContentType("text/plain");

            JSONObject json = new JSONObject();

           String blobKeyString = blobKey.getKeyString();

            PrintWriter out = resp.getWriter();
            out.print(blobKeyString);
            out.flush();
            out.close();

为什么我的 String blobKeyString 在返回到 android 应用程序时，在正文中继续具有 html 文档的值：

405 HTTP method POST is not supported by this URL

Answer 1

查看错误，这意味着您需要一种方法来处理对您的应用的 POST 请求。

我会将接收请求的 URL 上的 servlet 更改为具有“doPost”而不是“doGet”。