чт, 26 мар. 2020 г. в 18:03, Christopher Schultz <ch...@christopherschultz.net>: > > All, > > I'm developing my first multipart handler since .. I dunno, maybe > 2005? This is the first time I'll be using the Servlet 3.0 multipart > handling, of course through Tomcat. Some of these questions may have > answers which are "implementation-specific", so in this case, I would > like to know how things will behave in Tomcat specifically. Notes of > where the spec leaves things up to the implementation will be appreciate > d. > > I'd like to submit a form which has not only a large-ish file part, > but also some regular fields like <input type="text">. My > understanding is that I'll have to read those data by calling > Part.getInputStream(), wrapping the InputStream in an > InputStreamReader using the right charset, etc.
I think that those are available via the standard request.getParameter(name) API. > [...] > > Can I rely on the client to send the fields in any particular order? > I'm not expecting to store the file on the server myself; I'd like to > process it in a "streaming" fashion and not touch the disk if > possible. I know that the server may store the file on the disk if it > decides to. I'm not terribly worried about that. I just don't want to > have to write the file to the disk TWICE, and I need information from > those other parameters in order to configure the stream-processing. Michael already answered this. There is a configurable threshold. Anything over it will be written to disk as a temporary file. The JavaDoc for Part.write() says that it can be implemented as moving the file. "This method is not guaranteed to succeed if called more than once" > When iterating over the Collection<Part> returned from > HttpServletRequest.getParts(), am I required to process each part in > order immediately? Or can I store a reference to a Part for later? > This kind of goes along with the previous question. You can store the reference, but your "for later" should be no longer than until the request processing ends. > When I'm done with a part, must I explicitly call Part.delete()? Tomcat deletes the files automatically (I implemented this feature in Tomcat 7.0.30 - see changelog). In my own web applications I delete the files explicitly (calling part.delete() in a cycle). Best regards, Konstantin Kolinko --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
