jxtaappdemo.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: JxtaAppDemo.java,v 1.9 2001/12/16 20:46:25 hamada Exp $
 */

import java.io.InputStream;
import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.util.Enumeration;

import net.jxta.peergroup.PeerGroup;
import net.jxta.peergroup.PeerGroupFactory;
import net.jxta.exception.PeerGroupException;
import net.jxta.document.Advertisement;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.MimeMediaType;
import net.jxta.discovery.DiscoveryService;
import net.jxta.discovery.DiscoveryListener;
import net.jxta.discovery.DiscoveryEvent;
import net.jxta.protocol.DiscoveryResponseMsg;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.protocol.PeerAdvertisement;

import net.jxta.impl.peergroup.Platform;
import net.jxta.impl.peergroup.GenericPeerGroup;



/**
 *  This is a quick and simple example to primarly illustrate how to start project jxta
 *  from an application, and how to create a DiscoveryListener interface
 *  This is meant as an on going effort, if you can add to the
 *  example to help others understand, and integrate project jxta,
 *  feel free to do so, please refer to the "todo" section in README .
 */

public class JxtaAppDemo implements Runnable, DiscoveryListener {


    // classInit supplies these
    static PeerGroup platformGroup = null;
    static PeerGroup netPeerGroup  = null;
    static PeerGroupAdvertisement groupAdvertisement = null;

    private DiscoveryService discovery;
    private int myqueryid;
    PeerAdvertisement padv;



    public JxtaAppDemo() {

    }
     
     private void startJxta() {
        try {

            netPeerGroup = PeerGroupFactory.newNetPeerGroup();

            // uncomment the following line if you want to start the app defined
            // the NetPeerGroup Advertisement (by default it's the shell)
            // in our case we want use jxta directly.
            
            // netPeerGroup.startApp(null);


        } catch ( PeerGroupException e) {
            // could not instanciate the group, print the stack and exit
            System.out.println("fatal error : group creation failure");
            e.printStackTrace();
            System.exit(1);
        }

        // obtain our group advertisement
        groupAdvertisement = netPeerGroup.getPeerGroupAdvertisement();

        // Let's get the discovery service we're going to use this
        // one later on
        discovery = netPeerGroup.getDiscoveryService();
    }

    /**
     * This thread basically loops forever discovering peers
     * every minute, and displays the results.
     */

    public void run() {
       try {
       // Add ourselves as a DiscoveryListener for DiscoveryResponse events
       discovery.addDiscoveryListener(this);
       discovery.getRemoteAdvertisements(null, 
              DiscoveryService.PEER,
              null,null, 1, null);

       while (true) {
           // wait a bit before sending a discovery message
           try {
              Thread.sleep(10 * 1000);
           } catch(Exception e) {
           }
            System.out.println("Sending a Discovery Message");
            // look for any peer
            discovery.getRemoteAdvertisements(
                null,
                DiscoveryService.PEER,
                null,
                null, 
                5, 
                null);

         /* uncomment the following for group discovery 
            look for any group

             myqueryid = discovery.getRemoteAdvertisements(null,
               DiscoveryService.GROUP,
               null,
               null, 5);
          */
         }
        } catch(Exception e) {
            e.printStackTrace();
        }
    }


/**
 * by implementing DiscoveryListener we must define this method
 * to deal to discovery responses
 */

 public void discoveryEvent(DiscoveryEvent ev) {

      DiscoveryResponseMsg res = ev.getResponse();
      
      // let's get the responding peer's advertisement
      String aRes = res.getPeerAdv();
      try {

       InputStream is = new ByteArrayInputStream( (aRes).getBytes() );

       padv = (PeerAdvertisement)
       AdvertisementFactory.newAdvertisement(
                new MimeMediaType( "text/xml" ), is);
       System.out.println (" [  Got a Discovery Response ["+
           res.getResponseCount()+ " elements]  from peer : "+ padv.getName() +"  ]");

      } catch (IOException e) {
        // bogus peer, skip this message alltogether.
        System.out.println("error parsing remote peer's advertisement");
        e.printStackTrace();
        return;
      }
      // now out the goodies
      Enumeration enum = res.getResponses();

      String str=null;
      Advertisement adv=null;

        while (enum.hasMoreElements()) {

          try {
          str = (String) enum.nextElement();
          // print out the response
          // System.out.println(str);

          // the following illustrates how to create
          // the advertisement object from a response
          adv =(Advertisement)
          AdvertisementFactory.newAdvertisement
                  (new MimeMediaType ("text/xml"),
                   new ByteArrayInputStream
                   (str.getBytes()));
         } catch (IOException e) {
	   // got a bad response. continue to the next response
           System.out.println("error parsing response element");
           e.printStackTrace();
           continue;
        }
    
       }

     }

static public void main(String args[]) {
  JxtaAppDemo myapp  = new JxtaAppDemo();
  myapp.startJxta();
  myapp.run();
}

}