All you guru's. There must be a way to do this... Please help..........

[Eric Howell]

I wonder if someone could lend me a hand.
In the following snippit of code I want to validate that I have connected to the correct URL. How can I do this.

public void testUrl(URL u) 
{    
  try  
  {                      
    BufferedReader br = new BufferedReader(new InputStreamReader  (u.openConnection().getInputStream())); ect

Hope someone can help me out as I fail to find away but feel that you must be able to do this.
Thanks in advance

[Madhav Lakkapragada]

I want to validate that I have connected to the correct URL
What kinda validation are you talking abt?
wether the URL is available and doesn't give
a 404 Not found error or something else...
please let us know a little more.
regds.
- satya

[Marilyn de Queiroz]

While I'm not a guru, how about

public void testUrl( URL u )
{
    try
    {
        Connection con = u.openConnection() ;
        if ( con == null )
        {
            System.out.println( "null connection" );
        }
        else
        {
            System.out.println( con.getURL() );
            BufferedReader br = new BufferedReader( new InputStreamReader( con ) );
        }
    }
}

[This message has been edited by Marilyn deQueiroz (edited September 07, 2001).]

[Madhav Lakkapragada]

if ( con == null )
{
System.out.println( con.getURL() );
}
What?
getURL() on a null object...
- satya

[Manjunath Subramanian]

Hi Eric,
What kind of validation are you talking about?
Is it something like opening a connection to a URL and downloading and processing the contents or is it something else?
Other wise this is a question more or less related to I/O!!
Manjunath

[Eric Howell]

Originally posted by Manjunath Subramanian:

Hi Eric,
What kind of validation are you talking about?
Is it something like opening a connection to a URL and downloading and processing the contents or is it something else?
Other wise this is a question more or less related to I/O!!
Manjunath

Hi Manjunath
The validation I'em after is that I have connected to the actual URL (as given in a form field on submission).
Its for a URL portlal and I want to get some information from the HTML of the given URL- not from the HTML of the error page.
At the moment I'em catching exeptions and doing it like that.
Basically-validation I have connected to the correct URL-eg that it in fact exists.
Hope you can understand my explanation Manjunath.
Thanks for your help

[Marilyn de Queiroz]

if ( con == null )
{
    System.out.println( con.getURL() );
}

What?
getURL() on a null object...
- satya

oops
I fixed it.

[Madhav Lakkapragada]

Marilyn:
I was just nitpicking......
I knew you had a typo or something....

- satya

[Manjunath Subramanian]

Hello Eric,
If i am right in getting what you are trying to
say then i think the little code i have written below should help you.What this program does is tries to open a URL stream
on a valid URL and downloads the html onto a file and at the same
time displaying the same on the command prompt window.
import java.net.*;
import java.io.*;
public class Yahoo{
public static void main(String a[]) throws Exception
{
InputStream is = null;
BufferedOutputStream br = new BufferedOutputStream(new FileOutputStream("yahoo.html"));
try{
URL u = new URL("http://www.yahoo.com/index.html");
if( u.openConnection() != null)
{
is = u.openStream();
int i = (int)is.read();
while(i != -1)
{
br.write(i);
System.out.print((char)i);
br.flush();
i = (int)is.read();
}
}
else
{
System.out.println("Not a valid connection");
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
}

Hope this helps buddy,
Manjunath
[This message has been edited by Manjunath Subramanian (edited September 07, 2001).]

[Eric Howell]

Thanks for all your help guys. I now have a few ideas to be getting on with.