How to POST large data to servlet?

[VacantFish]

I want to use HTTP's POST method to send some very large and unknown length data to server. The servlet just receives the data and writes them to disk. The data may be larger than server's buffer size.
When the doPost method of my servlet is triggered, has all the content of the HTTP request been transferred to server side?

If so, how can I POST very large data by HTTP POST method?

If not, the calling to getInputStream() does open the valve to accept data. Am I right?

[skyyoung]

http://www.csdn.net/Expert/TopicView.asp?id=85336&datebasetype=200101

[VacantFish]

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[pdev]

May you can't transfer very large and unknown length data to server via POST, because the length of data is necessary for this protocol.
Perhaps you can use socket,or divide the data to some less package and then transfer with POST.

[VacantFish]

After doing some test by myself, I have the conclusion:

1) TOMCAT will buffer the request before pass it to the servlet, so it's IMPOSSILBE to transfer large data synchronizly.

2)skyyoung's answer is helpfulless to me. the article in his URL just tell that using MIME multi-part can trasfer data by POST.

3) pdev's opnion is wrong. chunked model need tell the exact length of your data.