ejbtest.java

《JAVA WEB服务应用开发详解》代码.zip

/*
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 * 1. Redistributions of source code must retain the above copyright
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 *       "This product includes software developed by the
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2000, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package samples.weblogic_ejb;

import java.io.*;
import java.net.*;
import java.util.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;

/**
 * This sample class makes use of a stateful ejb service.
 * The code contains a loop of 10 on one of the service's method to show that we are in a stateful mode.
 * On the server side an instance variable (counter) keeps track on how many time the service has been called.
 *
 * @author <a href="mailto:[e-mail]">Olivier Brand</a>
 * @version 1.0
 * @since 1.0
 */
public class ejbtest {
    /**
     * Describe <code>main</code> method here.
     *
     * @param args a <code>String[]</code> value
     * @exception Exception if an error occurs
     */
    public static void main (String[] args) throws Exception {
    if (args.length != 2 ) {
      System.err.println ("Usage: java " + ejbtest.class.getName () +
                          " SOAP-router-URL helloword");
      System.exit (1);
    }

    // Process the arguments.
    URL url = new URL (args[0]);

    String ejbKey = null;

    // This is the main EJB service
    // After the first call and response processing, the service name contains the EJB
    // Base 64 encoded reference to keep the context between calls. It ensures that the same EJB instance is being called.
    //
    String service = "urn:ejbhello";


    // Build the call and loop 10 times to show the stateful behavior on the EJB provider
    for(int i=0; i < 10;i++)
        {
            Call call = new Call ();

            call.setTargetObjectURI (service);
            call.setMethodName ("hello");
            Vector params = new Vector ();
            // Olivier: Added
            String encodingStyleURI = Constants.NS_URI_SOAP_ENC;
            String symbol = args[1];
            // Olivier: uncommented
            call.setEncodingStyleURI(encodingStyleURI);
            params.addElement (new Parameter("symbol", String.class, symbol, null));

            call.setParams(params);

            // make the call: note that the action URI is empty because the
            // XML-SOAP rpc router does not need this. This may change in the
            // future.
            Response resp = call.invoke (/* router URL */ url, /* actionURI */ "" );

            // Check the response.
            if (resp.generatedFault ())
                {
                    Fault fault = resp.getFault ();
                    System.out.println ("Ouch, the call failed: ");
                    System.out.println ("  Fault Code   = " + fault.getFaultCode ());
                    System.out.println ("  Fault String = " + fault.getFaultString ());
                }
            else
                {
                    Parameter result = resp.getReturnValue ();
                    // This line is very important when using the stateful EJB.
                    // The SOAP provider concatenated the EJB reference to the URI, allowing to keep
                    // the state between client's call.
                    // Removing this line would make the service behaving like a stateless service with a big overhead though (creation of many EJBs)
                    service = resp.getFullTargetObjectURI();

                    System.out.println ( result.getValue() );
                }
        }
  }
}