i have a servlet in which i try to upload an image. i have pasted my
servlet class here, that gets called from a jsp.
<form action="/testuploadmimevalidation?provider-key=testprovider"
method="post" enctype="multipart/form-data" >
public class TestUploadMimeValidation extends HttpServlet {
private BlobstoreService blobstoreService =
BlobstoreServiceFactory.getBlobstoreService();
private static final Logger log =
Logger.getLogger(TestUploadMimeValidation.class.getName());
private static final boolean PRODUCTION_MODE =
SystemProperty.environment.value() ==
SystemProperty.Environment.Value.Production;
private static final String URL_PREFIX = PRODUCTION_MODE ? "" :
"http://127.0.0.1:8080";;
public void doPost(HttpServletRequest req, HttpServletResponse
res)
throws ServletException, IOException {
InputStream in = req.getInputStream();
int formDataLength = req.getContentLength();
byte dataBytes[] = new byte[formDataLength];
int len;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while ((len = in.read(dataBytes, 0, formDataLength)) != -1)
bos.write(dataBytes, 0, len);
dataBytes = bos.toByteArray();
String urlStr = URL_PREFIX
+BlobstoreServiceFactory.getBlobstoreService().createUploadUrl("/
testupload");
URLFetchService urlFetch =
URLFetchServiceFactory.getURLFetchService();
HTTPRequest request = new HTTPRequest(new URL(urlStr),
HTTPMethod.POST, FetchOptions.Builder.withDeadline(10.0));
request.setHeader(new HTTPHeader("Content-Type","multipart/
form-data"));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
request.setPayload(dataBytes);
try {
urlFetch.fetch(request);
} catch (IOException e) {
// Need a better way of handling Timeout exceptions
here - 10 second deadline
//log.error("Possible timeout?",e);
}
}
}
the image loads fine into the Blobstore but i get a
NullpointerException. i've read that a DoGet and a DoPost is required
in the target servlet class ("/testupload"): http://jeremyblythe.blogspot.com/
I have implemented those but i keep getting the exception. am I not
supplying enough parameters to the request object? there aren't many
examples online where the blob is uploaded through a servlet by using
the urlfetch.Fetch().
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