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openConnection vs connect

Posted on 2006-07-13
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Last Modified: 2012-06-27
hi guys..

Referring to http://java.sun.com/j2se/1.4.2/docs/api/java/net/URLConnection.html, openConnection() is "Manipulate parameters that affect the connection to the remote resource", while connect() is "Interact with the resource; query header fields and contents."

What's the difference in practical terms? Any analogy to refer?

Does it mean, openConnection is to set the various values of any kind, such as the address, communication format, etc..
while connect() means get ready to output data and/or do work, as the connection has been established?

I'm trying to set the timeout feature, but still trying to get it to work. I had set it after calling openConnection(), and before connect(). And would like to find out the above details. So that, perhaps I can get the idea myself ;)
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Question by:java_kevin
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Expert Comment

by:girionis
ID: 17098514
Hi java_kevin

First you open a connection by calling openConnection() and then. after the openConnection() sets up the proper parameters, calls the connect() method to connect. The remote site is available then, after the connect() method is called.

Cheers
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LVL 35

Expert Comment

by:girionis
ID: 17098518
From the URL: http://java.sun.com/j2se/1.3/docs/api/java/net/URLConnection.html

   1.  The connection object is created by invoking the openConnection method on a URL.
   2. The setup parameters and general request properties are manipulated.
   3. The actual connection to the remote object is made, using the connect method.
   4. The remote object becomes available. The header fields and the contents of the remote object can be accessed.
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Expert Comment

by:girionis
ID: 17098523
java_kevin,

> Does it mean, openConnection is to set the various values of any kind,
> such as the address, communication format, etc..
> while connect() means get ready to output data and/or do work, as the
> connection has been established?

Yes
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Author Comment

by:java_kevin
ID: 17098535
yup, i saw the URL, but did not understand the stuff they are writing about.

So, does it matter if setReadTimeout is called before openConnection or before connect()?
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LVL 35

Expert Comment

by:girionis
ID: 17098559
java_kevin
> So, does it matter if setReadTimeout is called before openConnection
> or before connect()?

Better call it before you open the connection otherwise it might get the default read timeout, since the new value would be set after you connect (if you set it after).
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Accepted Solution

by:
girionis earned 125 total points
ID: 17098577
> Better call it before you open the connection

I mean call it before you connect using the connect() method.
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Author Comment

by:java_kevin
ID: 17098580
oh.. ok ..thanks.. checking on it..
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Author Comment

by:java_kevin
ID: 17135255
hey guys,

I just realised that, the settimeout is applicable only to Weblogic 8.1 that I'm using. Sun does not have this feature.. Am I right?
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LVL 35

Expert Comment

by:girionis
ID: 17136214
Nope, it's also applicable to Sun, if you are using jdk.15 and above.
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Expert Comment

by:girionis
ID: 17136221
Sorry, I was talking about the setReadTimeout. I think you are right, the setTimeout is WLS specific only.
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