On 10.12.2019 15:31, Christopher Schultz wrote:
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Behrang,
On 12/8/19 05:18, Behrang Saeedzadeh wrote:
If I call javax.servlet.ServletRequest#getInputStream after having
called javax.servlet.http.HttpServletRequest#getPart, even without
performing any operations on the given part, I am getting an empty
stream (0-bytes).
Is this in compliance with the spec?
What does the servlet spec say about that situation?
A bit in defense of the OP, I have to say that the Servlet Spec (4.0 final) does not seem
extremely clear on that subject.
In section "3.1.1 When Parameters Are Available", it /does/ say this :
"If the conditions are met, post form data will no longer be available for
reading directly from the request object’s input stream."
But among those conditions that have to be met (just above that quote) is
"4. The servlet has made an initial call of any of the "getParameter family" of
methods
on the request object."
(So there, it talks about "the getParameter family", not the "getPart" ones).
It only talks about the "getPart" methods in the next section "3.2 File upload", and in
that section, all it says about the input stream is :
"If the servlet container does not provide the multi-part/form-data processing,
the data will be available through the HttpServletReuqest.getInputStream."
So the way I read this, is that there is nothing that explicitly says that the InputStream
is no longer available if you have called "getPart".
(It is also in fact not very clear about what happens to the parameters, when the
content-type of the Request is "multipart/form-data", which is only mentioned in section 3.2.)
On the other hand,
http://tomcat.apache.org/tomcat-9.0-doc/servletapi/index.html
--> Interface HttpServletRequest
says :
Part getPart(java.lang.String name)
throws java.io.IOException,
ServletException
Gets the named Part or null if the Part does not exist. *Triggers upload of all
Parts*.
(emphasis mine)
which /may/ be taken to mean (and probably does) that it consumes the whole
InputStream.
But again, this may be lacking some overall clarity.
In any case, the OP's question is not really unwarranted, unless there is some other
explanation somewhere which I have missed.
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