Sorry I didn't realize this was the Java-specific discussion - so I assume you're using Java!
To get you started: I've used a library from http://forums.sun.com/thread.jspa?forumID=31&threadID=451245 to create the multi-part POST request My code gets an image's data from a URL, uploads it to the Blobstore, and returns the blobkey. I'll pick it up from where I get the data byte[] data = new byte[contentLength]; int bytesRead = 0; int offset = 0; while (offset < contentLength) { bytesRead = in.read(data, offset, data.length - offset); if (bytesRead == -1) break; offset += bytesRead; } in.close(); //create POST to upload to blogstore BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService(); String uploadURL = blobstoreService.createUploadUrl("/ uploadblob"); //add host if in dev mode if (uploadURL.indexOf("http") == -1) uploadURL = "http://127.0.0.1:8888"; + uploadURL; 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); // write a text field element - This should be removed - left over from multipart library demo code out.writeField("myText", "text field text"); // write bytes directly out.writeFile("myFile", contentType, fileName, data); out.close(); // read response from server BufferedReader responseIn = new BufferedReader( new InputStreamReader(urlConn.getInputStream())); StringBuilder redirectResponse = new StringBuilder(); String line=""; while((line = responseIn.readLine()) != null) { redirectResponse.append(line); } in.close(); //extract the blobstore key from the response String blogKeyStr = Utilities.findSubString(redirectResponse.toString(), "blogkey = '", "'</H1>"); if (blogKeyStr == null || blogKeyStr.equals("FAILED")) throw new IOException("Failed to upload image blob"); return blogKeyStr; ========================================== To make it work you also need a couple servlets (make sure you add them to web.xml): public class UploadBlob extends HttpServlet { private BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService(); public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req); BlobKey blobKey = blobs.get("myFile"); String resultKey = "UPLOAD-FAILED"; if (blobKey != null) { resultKey = blobKey.getKeyString(); } res.sendRedirect("/blobuploadredirect?blobkey=" + resultKey); } } ========================================== public class Blobuploadredirect extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String blobkey = request.getParameter("blobkey"); if (blobkey == null) blobkey = "FAILED"; response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n" + "<HTML>\n" + "<HEAD><TITLE>Hello WWW</TITLE></HEAD>\n" + "<BODY>\n"); out.println("<H1>blogkey = '" + blobkey + "'</H1></BODY></HTML>"); } } -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
