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https://issues.apache.org/jira/browse/EMAIL-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12518254
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Thorbjørn Ravn Andersen commented on EMAIL-67:
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Have you investigated the java.io.ByteArrayOutputStream class?
There is an example using an ObjectOutputStream at
http://www.exampledepot.com/egs/java.io/SerializeObj.html
> Create e-mail attachment using an OutputStream
> ----------------------------------------------
>
> Key: EMAIL-67
> URL: https://issues.apache.org/jira/browse/EMAIL-67
> Project: Commons Email
> Issue Type: New Feature
> Affects Versions: 1.0
> Reporter: Charl Gerber
> Assignee: Ben Speakmon
> Priority: Minor
> Fix For: 1.1
>
>
> I'm using POI to create .xls files in memory that I want to send as e-mail
> attachments. I now have to first save the created POI workbooks, then attach
> the files to the e-mail and then have a mechanism to clean up the temporary
> files after the mail was sent. The POI HSSFWorkbook has a method:
> write(java.io.OutputStream stream)
> If this operation could write directly into the e-mail attachment, it would
> increase performance and require a lot less overhead to manage the temporary
> files.
> I am sure there are plenty other examples of attachments being created as
> files in memory that could be sent directly without having to create it as an
> actual file first.
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