Google app engine 使用文件名从AppEngine中的BlobStore下载Blob

文件存储在Appengine Blobstore中。我有一个servlet处理程序，允许用户下载文件。我用BlobStoreService来做这个

在我的servlet中，我有以下内容：

BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
BlobKey blobKey = new BlobKey( "SOME_BLOB_KEY_HERE" );
blobstoreService.serve(blobKey, res);

它工作得很好。下载文件的文件名来自servlet映射

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如何在my servlet中设置文件的文件名？

您需要在响应中添加内容处置头：

BlobstoreServiceFactory.getBlobstoreService().serve(blobKey, resp);
BlobInfo blobInfo = new BlobInfoFactory().loadBlobInfo(blobKey);

String encodedFilename = URLEncoder.encode(blobInfo.getFilename(), "utf-8");
encodedFilename.replaceAll("\\+", "%20");
resp.setContentType("application/octet-stream");

resp.addHeader("Content-Disposition", "attachment; filename*=utf-8''" + encodedFilename );

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您需要将内容处置标头添加到响应：

BlobstoreServiceFactory.getBlobstoreService().serve(blobKey, resp);
BlobInfo blobInfo = new BlobInfoFactory().loadBlobInfo(blobKey);

String encodedFilename = URLEncoder.encode(blobInfo.getFilename(), "utf-8");
encodedFilename.replaceAll("\\+", "%20");
resp.setContentType("application/octet-stream");

resp.addHeader("Content-Disposition", "attachment; filename*=utf-8''" + encodedFilename );