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Question about URLConnection

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Join Date: Nov 2004

Posts: 189

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George2

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Junior Poster

Question about URLConnection

Mar 9th, 2005

Hello everyone,

I am using HTTP protocol to transfer large amount of data across two machines. And I have found out that some packages will be lost when using the following source codes. I am wondering whether there are anything wrong or potential issues in them.

Data request

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
	URLConnection conn = url.openConnection();
	conn.connect();
	InputStream is = conn.getInputStream();
	while (true)
	{
		// read a buffer from is
 
		// if no more data, escape from while loop
 
		// process the data contained in the buffer
	}
	URLConnection conn = url.openConnection();
	conn.connect();
	InputStream is = conn.getInputStream();
	while (true)
	{
		// read a buffer from is

		// if no more data, escape from while loop

		// process the data contained in the buffer
	}

Data response

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
	protected void doGet(HttpServletRequest req, HttpServletResponse 
 
res) throws ServletException, IOException {
 
	OutputStream os = res.getOutputStream();
	while (true)
	{
		// read a buffer from a large file
 
		// modify buffer according to application logics
 
		// if no more data, escape from while loop
 
		// write modified buffer to os
	}
 
}
	protected void doGet(HttpServletRequest req, HttpServletResponse 

res) throws ServletException, IOException {

	OutputStream os = res.getOutputStream();
	while (true)
	{
		// read a buffer from a large file

		// modify buffer according to application logics

		// if no more data, escape from while loop

		// write modified buffer to os
	}

}

I am wondering whether the package losing is caused by the reason that, data response is too fast than data receiving so data receiving application will miss some chances to read packages.

I am also wondering what is the effective approach of transfering data across two machines using HTTP protocol without losing any packages. Are there any online samples?

Thanks in advance,
George

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Join Date: Jun 2004

Posts: 2,108

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server_crash server_crash is offline

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Re: Question about URLConnection

Mar 9th, 2005

I could be wrong about this, but I would think no matter how you do it, it would be possible to loose some packets due to the quality of the connection, and so forth. Again, I could be wrong, so maybe somone that knows a little more than me can help you.

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Join Date: Nov 2004

Posts: 189

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George2

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Junior Poster

Re: Question about URLConnection

Mar 9th, 2005

Thanks server_crash,

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Originally Posted by server_crash

I could be wrong about this, but I would think no matter how you do it, it would be possible to loose some packets due to the quality of the connection, and so forth. Again, I could be wrong, so maybe somone that knows a little more than me can help you.

Your idea is very helpful. Do you know any online resources dealing with similar topics?

regards,
George