RegistryClientTutorial < IVOA

---++ Using the NVO Registry WebService from Java and C#

Below I briefly describe how to make a simple client for the registry prototype.
---+++ The Service URL
First we need the service URL which is  http://sdssdbs1.stsci.edu/nvo/registry/registry.asmx
---+++ The Java Client 
Next we need some Client code  - here is a simple client in Java 
<pre>
import org.us_vo.www.*;

class RegClient {
public static void main (String[] args) throws Exception {
    RegistryLocator loc = new RegistryLocator();
    RegistrySoap reg = loc.getRegistrySoap();
    ArrayOfSimpleResource reses = null;
    if ( args.length ==0 ) {
   reses = reg.dumpRegistry();
    } else {
   reses = reg.queryRegistry(args[0]);
    }
   for (int i = 0 ; i < reses.getSimpleResource().length; i++) {
      print(reses.getSimpleResource(i));

   }
}
   public static void print(SimpleResource res ) {
   System.out.println(res.getTitle()+ "|"+ res.getPublisher() + "|" + res.getMaxSR());

   }
}
</pre>

AXIS always creates Localtor classes - where the service url may be changed.<br>
Simple Resource is the object returned by the registry.

---++++ Making the client work
Obviously of we compile this none of the stub classes exist so we need to create them.
If you have AXIS installed and a class path set up as detailed on WebgridTutorial then this is a simple matter of typing:
<pre>
java org.apache.axis.wsdl.WSDL2Java "http://sdssdbs1.stsci.edu/nvo/registry/registry.asmx?WSDL"
</pre>
*Note:* The \" are really important.

*?WSDL* is a convention for getting the WSDL frm a service. You will have seen this plenty earlier in the tutorial.

Now the client code should comile so Assuming the above code is in a file called RegClient.java we type :

<pre>
javac RegClient.java
</pre>
and we may run it as follows 
<pre>
java RegClient "Subject like '%cosmology%'"
NOAO Science Archive|National Optical Astronomy Observatories|2.0
Hubble Space Telescope|Space Telescope Science Institute/MAST|180.0
Advanced Camera for Surveys|Space Telescope Science Institute/MAST|180.0
Faint Object Camera|Space Telescope Science Institute/MAST|180.0
....
</pre>
-- WilliamOMullane - 02 Oct 2003  
<br><br><br>
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Topic revision: r3 - 2003-10-02 - TWikiGuest