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How to send HTTP request to the Web Service

Posted on 2009-05-09
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Last Modified: 2013-11-19
Hi, I am trying this code to send a HTTP Request to a Web Service to check whether the WebService is up or not at a given URL:

***********************

String requestUrl= "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL";
           
            try {
           
                  URL url = new URL(requestUrl.toString());
           
                 
                         HttpURLConnection aConnection = (HttpURLConnection) url.openConnection();
      BufferedReader buffer = new BufferedReader(new InputStreamReader(aConnection.getInputStream()));

                       String line = "";
                       while ((line = buffer.readLine()) != null)
                                                   {
                           System.out.println(line);
                       }

********************
But when I run the code, I get this exception:

java.net.UnknownHostException: www.w3schools.com

I can access this WSDL by typing the url in my explorer which means I have the connectivity to this URL. Any help on this, please?

Thanks
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Question by:LeoKris
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LVL 92

Accepted Solution

by:
objects earned 250 total points
ID: 24343132
check your browsers proxy settings and use them when you run your app

http://helpdesk.objects.com.au/java/how-to-tell-a-java-application-to-use-a-proxy-server
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Author Comment

by:LeoKris
ID: 24343299
There is no proxy setting in my internet explorer..it is not "checked" and there is no script configured too.
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LVL 86

Expert Comment

by:CEHJ
ID: 24343480
Perhaps you have DNS problems. Try

String requestUrl= "http://216.128.29.26/webservices/tempconvert.asmx?WSDL";
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Author Comment

by:LeoKris
ID: 24343635
oh..thanks for pointing that out.. I will try and let you know.
0
 

Author Comment

by:LeoKris
ID: 24347496
strange thing happened... I tried the same code in IntelliJ IDEA and it works like magic... it works with the dns name i.e. www.w3schools.com.

Don't know what is the difference between the IDEs.

Anyway, thanks a lot CEHJ.
0
 
LVL 92

Expert Comment

by:objects
ID: 24347553
Could be a problem with then Network settings in the IDE
Or just a tempoeaey network glitch
0
 
LVL 92

Assisted Solution

by:objects
objects earned 250 total points
ID: 24347558
The code itself is fine
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24347563
Has the original problem disappeared too, or is it still there?
0
 

Author Comment

by:LeoKris
ID: 24347583
The original problem is still there, The other IDE I am using is eclipse but in a different laptop. Something to do with Network settings probably.
0
 

Author Closing Comment

by:LeoKris
ID: 31579891
Thanks for pointing in the right direction.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24347646
>>Something to do with Network settings probably.

I'm wondering why you've accepted an answer if the problem remains undiagnosed ..?
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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