问使用模拟POST通过字节数组更新byte存储

EN

byte[] htmlData = // ...I already have the byte array I want to store/update)

    BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
            String uploadURL = blobstoreService.createUploadUrl("/upload");

                         //add host if in dev mode
             if(uploadURL.indexOf("http") == -1)
             {
                 uploadURL = "http://localhost:8888" + uploadURL;
             }
             URL url = new URL(uploadURL);
             // create a boundary string
             String boundary = MultiPartFormOutputStream.createBoundary();
             URLConnection urlConn = MultiPartFormOutputStream.createConnection(url);
             urlConn.setReadTimeout(15000);
             urlConn.setRequestProperty("Accept", "*/*");
             urlConn.setRequestProperty("Content-Type", MultiPartFormOutputStream.getContentType(boundary));
             // set some other request headers...
             urlConn.setRequestProperty("Connection", "Keep-Alive");
             urlConn.setRequestProperty("Cache-Control", "no-cache");
             // no need to connect because getOutputStream() does it
             MultiPartFormOutputStream out = new MultiPartFormOutputStream(urlConn.getOutputStream(), boundary);
out.writeField("param", "value")
out.writeFile("myFile", "multipart/form-data", "content.html", htmlData);
         out.close();

public class Upload extends HttpServlet 
{

    private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();

    public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException 
    {
        UserService userService = UserServiceFactory.getUserService();
        User user = userService.getCurrentUser();
        Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
        BlobKey blobKey = blobs.get("myFile");
        String value = req.getParameter("param");
        Topic t = pm.getObjectById(Topic.class, key);
        t.setParam("value");
    try
    {
        pm.makePersistent(t);
    }