Multipart upload to appengine

问题

I'm having multiple problems with appengine (java/jersey), but now I'm stucked with uploading files via multipart.

I've read this answer: https://stackoverflow.com/a/31325201

It worked for localhost, but when I upload to appengine, it shows the same error when starting the server:

java.lang.SecurityException: Unable to create temporary file

Does anyone know why it can be?

Thanks!

回答1:

You have to use Blobstore for uploading.

Call blobstoreService.createUploadUrl to create an upload URL for the form that the user will fill out, passing the application path to load when the POST of the form is completed.

<body>
    <form action="<%= blobstoreService.createUploadUrl("/upload") %>" method="post" enctype="multipart/form-data">
        <input type="file" name="myFile">
        <input type="submit" value="Submit">
    </form>
</body>

and then in servlet:

Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(req);
List<BlobKey> blobKeys = blobs.get("myFile");

You can upload files to Storage directly, but passing UploadOptions to .createUploadUrl:

UploadOptions options = new UploadOptions.Builder().withGoogleStorageBucketName("mybucket");
String uploadUrl = blobstoreService.createUploadUrl("/upload", options)

Follow documentation https://cloud.google.com/appengine/docs/java/blobstore/#Java_Uploading_a_blob

来源：https://stackoverflow.com/questions/37731114/multipart-upload-to-appengine

标签

java

google-app-engine

jersey-2.0