將圖像上傳到Google App Engine上的Blob存儲

Question

我是App Engine的新手，正在致力於在Blob存儲上上傳圖像。 我正在從android應用程序上傳圖片。 我已計划將Blob鍵保存在實體中，以便在它符合特定條件時可以檢索它。

我的問題是：
1.自從我實現了“上傳處理程序”以來，blob存儲區就不存儲圖像。 在實施“上傳處理程序”之前，它已正確保存。
2.另一個問題是，上傳處理程序未獲取任何Blob鍵。

請在下面找到代碼：

為了上傳圖片，Android中使用了以下代碼：

public void uploadBlobImage( String path, String link ) {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(link);

        try {
            MultipartEntity entity = new MultipartEntity();
            entity.addPart("type", new StringBody("photo"));
            File file = new File( path );
            entity.addPart("data", new FileBody(file, ContentType.create( "image/jpg")/*,"Swapnil.jpg" */));

            httppost.setEntity(entity);
            HttpResponse response = httpclient.execute(httppost);
            Log.d( Utils.AppName, "Image uploaded: "+ response.getStatusLine( ));
        } catch (Exception e) {
            Log.d( Utils.AppName, "Image not uploaded: Exception:"+ e.toString( ));
        }        
    }

上傳鏈接的格式為：

http://<server domain>/_ah/upload/AMmfu6YsZrgX5lDxBjlb5ddPQdGU6kd63WD9nN8FI2rOGpC1VA9qoyYneKYiLvNGNR0Mw-Oi_LyfKzxI9lvL7rjk0CoTuN7O_1rRCmTKLB2c4MOjRWJ8BKuiaquIvcQf-1H47ULHbMoY6w5_lZts8JiG1DDPez8iAQ/ALBNUaYAAAAAUzv_0cB5QIh3hkGn4CokBt0a37zGDAGm/

上傳Blob處理程序的代碼為：

public class UploadBlobHandler extends HttpServlet {

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse res)
        throws ServletException, IOException {
        BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();

        Map<String, List<BlobKey>> blobs = blobstoreService.getUploads( req );
        Set< String > set = blobs.keySet( );
        Utils.log.log( Level.SEVERE, "UploadBlobHandler.doPost() size::"+set.size( ));
        Iterator< String > iterator = set.iterator( );
        while ( iterator.hasNext( )) {
            Utils.log.log( Level.SEVERE, "UploadBlobHandler.doPost(): Blobstore key: "+iterator.next( ));
        }
        List< BlobKey> list = blobs.get("data");
        for(int i=0;list !=null && i<list.size( );i++){
            BlobKey key = list.get( i );
            Utils.log.log( Level.SEVERE, "UploadBlobHandler.doPost(): Blobstore key: "+key.getKeyString( ));
        }
}

我嘗試在web.xml中添加和刪除以下條目：

<servlet>
        <servlet-name>UploadBlobHandler</servlet-name>
        <servlet-class>com.swapnilutilities.eRecommendation.servlets.UploadBlobHandler</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>UploadBlobHandler</servlet-name>
        <url-pattern>/upload</url-pattern>
    </servlet-mapping>

在android上，將生成以下日志：

Image uploaded: HTTP/1.1 200 OK

在服務器日志上是：

0.1.0.30 - - [02/Apr/2014:05:02:02 -0700] "POST /upload HTTP/1.1" 200 53 - "Apache-HttpClient/UNAVAILABLE (java 1.4)" "domain.com" ms=327 cpu_ms=260 cpm_usd=0.000006 app_engine_release=1.9.2 instance=00c61b117cbb73996c2a0799c02bf971906801e2
E 2014-04-02 17:32:02.764
package.UploadBlobHandler doPost: UploadBlobHandler.doPost() size::0
E 2014-04-02 17:32:02.765
package.utils.Utils writeResponse: Swapnil: writeResponse():{"status":0,"ec":0}

為此，請指導我。

Answer 1

問題解決了。 雖然我不明白為什么會這樣。 我變了

new FileBody(file, ContentType.create( "image/jpg")/*,"Swapnil.jpg"*/ )

至

new FileBody(file, ContentType.create( "image/jpg"),"Swapnil.jpg" ).

由於某種原因，它解決了這個問題。