将分段上传到appengine [英] Multipart upload to appengine
问题描述
我读过这个答案。 ： https://stackoverflow.com/a/31325201
它为localhost工作，但是当我上传到appengine时，它在启动服务器时显示相同的错误：
java.lang.SecurityException ：无法创建临时文件
有谁知道它为什么可以？
谢谢！
调用 blobstoreService.createUploadUrl 为用户填写的表单创建一个上传URL，传递应用程序路径以加载POST表格已完成。
< body>
< form action =<％= blobstoreService.createUploadUrl（/ upload）％> method =postenctype =multipart / form-data>
< input type =filename =myFile>
< input type =submitvalue =提交>
< / form>
< / body>
然后在servlet中：
映射< String，List< BlobKey>> blobs = blobstoreService.getUploads（req）;
列表< BlobKey> blobKeys = blobs.get（myFile）;
您可以直接将文件上传到存储，但传递 UploadOptions 到 .createUploadUrl ：
UploadOptions options = new UploadOptions。 。生成器（）withGoogleStorageBucketName（ mybucket）;
String uploadUrl = blobstoreService.createUploadUrl（/ upload，options）
a href =https://cloud.google.com/appengine/docs/java/blobstore/#Java_Uploading_a_blob =nofollow> https://cloud.google.com/appengine/docs/java/blobstore/# Java_Uploading_a_blob
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!
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
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