client.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 THE APACHE SOFTWARE FOUNDATION 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.
 *
 */

/**
 * Client Application: This is the client side of the EX1 example that
 * looks for the JXTA-EX1 service and connects to its advertised pipe. The
 * Service advertisement is published in the NetPeerGroup
 * by the server application. The client discovers the service
 * advertisement and create an output pipe to connect to the service input
 * pipe. The server application creates an input pipe that waits to receive
 * messages. Each message receive is displayed to the screen. The client
 * sends an hello message. 
 */

import java.io.InputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.util.Enumeration;
import java.net.URL;

import net.jxta.platform.Application;
import net.jxta.document.Advertisement;
import net.jxta.document.AdvertisementFactory;
import net.jxta.document.StructuredTextDocument;
import net.jxta.document.MimeMediaType;
import net.jxta.document.TextElement;
import net.jxta.endpoint.Message;
import net.jxta.pipe.PipeService;
import net.jxta.pipe.PipeID;
import net.jxta.pipe.OutputPipe;
import net.jxta.id.ID;
import net.jxta.id.IDFactory;
import net.jxta.protocol.ModuleSpecAdvertisement;
import net.jxta.protocol.PipeAdvertisement;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.discovery.DiscoveryService;
import net.jxta.peergroup.PeerGroup;
import net.jxta.peergroup.PeerGroupFactory;
import net.jxta.exception.PeerGroupException;
import net.jxta.impl.peergroup.Platform;
import net.jxta.impl.peergroup.GenericPeerGroup;
import java.net.MalformedURLException;


/**
 *  Client Side: This is the client side of the JXTA-EX1
 *  application. The client application is a simple example on how to
 *  start a client, connect to a JXTA enabled service, and invoke the
 *  service via a pipe advertised by the service. The
 *  client searches for the module specification advertisement
 *  associated with the service, extracts the pipe information to
 *  connect to the service, creates a new output to connect to the
 *  service and sends a message to the service.
 *  The client just sends a string to the service no response
 *  is expected from the service.
 */

public class Client {

    static PeerGroup netPeerGroup = null;
    static PeerGroupAdvertisement groupAdvertisement = null;
    private DiscoveryService disco;
    private PipeService pipes;
    private OutputPipe myPipe; // Output pipe to connect the service
    private Message msg;

    public static void main(String args[]) {
        Client myapp = new Client();
        System.out.println ("Starting Client peer ....");
        myapp.startJxta();
        System.out.println ("Good Bye ....");
        System.exit(0);
    }

    public Client() { }

    private void startJxta() {
        try {
            // create, and Start the default jxta NetPeerGroup
            netPeerGroup = PeerGroupFactory.newNetPeerGroup();
        } 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);
        }
        
        // this is how to obtain the group advertisement
        groupAdvertisement = netPeerGroup.getPeerGroupAdvertisement();
        // get the discovery, and pipe service
        System.out.println("Getting DiscoveryService");
        disco = netPeerGroup.getDiscoveryService();
        System.out.println("Getting PipeService");
        pipes = netPeerGroup.getPipeService();
	startClient();
    }

    // start the client
    private void startClient() {

	// Let's initialize the client
	System.out.println("Start the Client");

	// Let's try to locate the service advertisement
	// we will loop until we find it!
	System.out.println("searching for the JXTA-EX1 Service advertisement");
	Enumeration enum = null;
	while (true) {
	    try {

		// let's look first in our local cache to see
		// if we have it! We try to discover an adverisement
		// which as the (Name, JXTA-EX1) tag value
		//
		enum = disco.getLocalAdvertisements(DiscoveryService.ADV
					     , "Name"
					     , "JXTASPEC:JXTA-EX1");

		// Ok we got something in our local cache does not
		// need to go further!
		if ((enum != null) && enum.hasMoreElements()) break;

		// We could not find anything in our local cache, so let's send a
		// remote discovery request searching for the service
		// advertisement.
		disco.getRemoteAdvertisements(null
					 , DiscoveryService.ADV
					 , "Name"
					 , "JXTASPEC:JXTA-EX1",1, null);

		// The discovery is asynchronous as we do not know
		// how long is going to take
		try { // sleep as much as we want. Yes we
		    // should implement asynchronous listener pipe...
		    Thread.sleep(2000);
		} catch (Exception e){
		}

	    } catch (IOException e){
		// found nothing!  move on
	    }

	    System.out.print(".");
	}
       
	System.out.println("we found the service advertisement");
 
	// Ok get the service advertisement as a Spec Advertisement
	ModuleSpecAdvertisement mdsadv = (ModuleSpecAdvertisement) enum.nextElement();
	try {

	    // let's print the advertisement as a plain text document
	    StructuredTextDocument doc = (StructuredTextDocument)
		mdsadv.getDocument(new MimeMediaType("text/plain"));

	    StringWriter out = new StringWriter();
	    doc.sendToWriter(out);
	    System.out.println(out.toString());
	    out.close();

	    // we can extract the pipe information to connect to the service
	    // from the advertisement as part of the Param section of the advertisement
	    StructuredTextDocument paramDoc = (StructuredTextDocument)  mdsadv.getParam();

	    // extract both the Pipe ID and the Pipe Type
	    // from the Paramdoc section
	    String pID = null;
	    String pType = null;

	    // get the pipe advertisement root element
	    Enumeration elements = paramDoc.getChildren("jxta:PipeAdvertisement");

	    // get the children element of the pipe advertisement
	    elements = ((TextElement) elements.nextElement()).getChildren();

	    while (elements.hasMoreElements()) {
		TextElement elem = (TextElement) elements.nextElement();
		String nm = elem.getName();

		 if(nm.equals("Id")) {
		     pID = elem.getTextValue();
		     continue;
		 }

		 if(nm.equals("Type")) {
		     pType = elem.getTextValue();
		     continue;
		 }
	    }

	    //Let's create a pipe advertisement from the service spec
	    //information
	    PipeAdvertisement pipeadv = (PipeAdvertisement) 
		AdvertisementFactory.newAdvertisement(
		  PipeAdvertisement.getAdvertisementType());
	    
	    try {
                URL pipeID = new URL(pID );
                pipeadv.setPipeID( (PipeID) IDFactory.fromURL( pipeID ) );
		pipeadv.setType(pType);
                } catch ( MalformedURLException badID ) {
		    badID.printStackTrace();
                    throw new IllegalArgumentException( "Bad pipe ID in advertisement" );
                }
	    
	    // Ok we have our pipe advertiseemnt to talk to the service
	    // create the output pipe endpoint to connect
	    // to the server, try 3 times to bind the pipe endpoint to
	    // the listening endpoint pipe of the service
	    for (int i=0; i<3; i++) {
		myPipe = pipes.createOutputPipe(pipeadv, 10000);
	    }

	    // create the data string to send to the server
	    String data = "Hello my friend!";

	    // create the pipe message
	    msg = pipes.createMessage();

	    msg.setString("DataTag", data);
 
	    // send the message to the service pipe
	    myPipe.send (msg);

	    System.out.println("message \"" + data + "\" sent to the Server");

	} catch (Exception ex) {
	    ex.printStackTrace();
	    System.out.println("Client: Error sending message to the service"); 
	}

    }
}