从命令行Java应用程序上传到Google App Engine中的BlobStore

Question

这是我的Blobstore上传命令行应用程序的服务器端代码：

public class UploadServlet extends HttpServlet
{
    private static final Logger log = Logger.getLogger(UploadServlet.class.getName());

    private final BlobstoreService bs = BlobstoreServiceFactory.getBlobstoreService();

    protected void doPost(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException
    {
        final Map<String, BlobKey> blobs = bs.getUploadedBlobs(request);
        final BlobKey blobKey = blobs.get("blob");

        if (blobKey == null)
        {
            log.severe("BlobKey was null!");
            response.sendRedirect("/error.html");
        }
        else
        {
            response.sendRedirect("/image?blob-key=" + blobKey.getKeyString());
        }
    }

    /**
     * Generates the custom single use blobstore URL's that are needed to upload to the blobstore programmatically. */
    protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException
    {
        final String uploadURL = bs.createUploadUrl("/upload");
        final PrintWriter pw = response.getWriter();
        response.setContentType("text/plain");
        pw.write(uploadURL);
    }
}

我已经获得了以下代码，可以在没有身份验证代码的情况下针对我的本地开发模式服务器工作，因此我知道multipart/form代码可以正常工作，但使用身份验证代码却失败了：

    r = opener.open(request)
  File "C:\Python26\lib\urllib2.py", line 397, in open
    response = meth(req, response)
  File "C:\Python26\lib\urllib2.py", line 510, in http_response
    'http', request, response, code, msg, hdrs)
  File "C:\Python26\lib\urllib2.py", line 435, in error
    return self._call_chain(*args)
  File "C:\Python26\lib\urllib2.py", line 369, in _call_chain
    result = func(*args)
  File "C:\Python26\lib\urllib2.py", line 518, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 302: Found

从Java移至Python，用于命令行客户端：

f = urllib2.urlopen('http://myapp.appspot.com/upload')
bloburl = f.read(1024)
print bloburl
print

image = file('120.jpg', 'r')
form = MultiPartForm()
form.add_file('blob', 'blob', image, 'image/jpeg')

request = urllib2.Request(bloburl)
body = str(form)
request.add_header('Content-type', form.get_content_type())
request.add_header('Content-length', len(body))
request.add_data(body)

opener = auth.get_auth_opener('myapp', 'username', 'password')
r = opener.open(request)
data = r.read()
print data

我只想要一个简单的命令行工具，该工具接受一个文件并将其发布到BlobStore。 我在互联网上的任何地方都找不到完整的示例。 有许多示例可以在GAE上完成所有工作，但没有一个示例是命令行客户端，它们从单独的客户端执行FORM的POST 。

Answer 1

从1.4.3版开始，有一个实验性API可直接写入blobstore。
它使您无需使用POST上传到blobstore。