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posting xml to a URL

dpalyca755
dpalyca755 asked
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To post data to a URL, let's say (http://999.99.99.99:9999), does the url need to be concatenated with any addtional syntax or it is as simple as
opening the connection,  setting doOutput to true, and then creating an outputStream
and then writing to it?

Do I need to flush the outputStream too?
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Awarded 2011
Awarded 2011

Commented:
You need to have some active enitity behind that URL which would read your data - it should be servlet or PHP script or CGI, or something which should be a process ready to accept your data

Then you indeed acn setDoOutput(true), etc. like in this example:

http://www.exampledepot.com/egs/java.net/post.html
Awarded 2011
Awarded 2011

Commented:
It usually is more than just address and port because the URL mentions that active entity which accepts your data. I don't think it is an absolute law, I guess you can invenet something to make this script accept your data by deafult on certain address and port, but as a rule after address and port you mention the name of that script which accepts your data, name of servlet or PHP ascript or something like that

Author

Commented:
If I create a URLConnection and open it, but do not open an outputStream on it yet, will I see activity on the server side socket or is it not until the stream is opened?
Awarded 2011
Awarded 2011

Commented:
I am not sure how you mean to see activity on the server side socket until the stream is opened.

Author

Commented:
If I am polling the socket on the URL's code will something be sent when the line
URLConnection con = url.openConnection(); is invoked, or is nothing sent until
con.getOutputStream() line in executed?
Awarded 2011
Awarded 2011
Commented:
No it does not start communicating until you get stream; read the accepted solution here:
http://stackoverflow.com/questions/39391/does-new-url-openconnection-necessarily-imply-a-post

Author

Commented:
Ok...so if the connection is refused upon opening the outputStream, a response or exception will be raised as long as the conn.getOutputStream() is in a try block,
or do I also need to open an inputStream to receive the potential reject?

Author

Commented:
Also: for inputStreams I would expect to see the server side socket get hit once with a GET query, whereas should I expect the outputStream to hit the socket twice, ie.. once with a POST and no data, and the the data from the actual write()?
Awarded 2011
Awarded 2011

Commented:
>or do I also need to open an inputStream to receive the potential reject?

I don't think there could be an universal answer to that question.
If you get no response say because you have incorrect address, then it makes no sense to open input stream. If you are rejected by the script in your URL which analyzed the data and prepared some srror message - then maybe inputStream will be necessary

i think it is better to deal with this situation using very concrete example - what kind of URL you are contacting and what you want to achieve. There are many variants of different types and situations of failures and we'll not predict all cases theoretically

Author

Commented:
I will need to ask the url developer I am working with this question.
When you say "what type of URL"?  What are you asking for exactly?

Author

Commented:
All I know at this moment is it is a http url to which I want to post XML data to.
Awarded 2011
Awarded 2011
Commented:
If I were you I'd try to use the code along the line of this example:
http://www.exampledepot.com/egs/java.net/post.html
and then see what is happening.
If you see the problems then ask the URL developer if it is someone you could contact

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