client.java

jdk 6.0的api文档．．．很难找到哦

/*
 * Copyright 2004 Sun Microsystems, Inc. All  Rights Reserved.
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 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following 
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 * 
 * -Redistributions of source code must retain the above copyright  
 *  notice, this list of conditions and the following disclaimer.
 * 
 * -Redistribution 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.
 *  
 * Neither the name of Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
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 */
package examples.activation; 

import java.rmi.*;
import java.rmi.registry.*;

/**
 * This program looks up a remote object's stub (that implements the remote
 * interface <code>MyRemoteInterface</code>) in the registry on the host
 * supplied as the optional first argument, and then invokes the stub's
 * <code>remoteMethod</code> method.  When this client invokes a remote method
 * on the stub acquired from the registry, the remote object will activate
 * if not already active.
 *
 * <p>This program should be run as follows:
 * <pre>
 *	java -Djava.security.policy=<i><b>client.policy</b></i>        \
 *	    -Dexamples.activation.client.codebase=<i><b>clientCodebase</b></i>      \
 *	    -Dexamples.activation.name=<i><b>name</b></i>	      \
 *	    examples.activation.Client [<i><b>host</b></i>]
 * </pre>
 *
 * <p>where:<ul>
 * <li><i><b>client.policy</b></i> is the security policy file for this
 * program,
 * <li><i><b>clientCodebase</b></i> is the root directory for this program's
 * class (used in granting permissions to this program in the
 * <i><b>client.policy</b></i> file)
 * <li><i><b>name</b></i> is the name for the object's stub 
 * in the registry 
 * <li><i><b>host</b></i> is the server's host
 * </ul>
 *
 * <p>Note: <code>rmid</code> must be running on its default port,
 * and <code>rmiregistry</code> must be running on its default port
 * (both on the remote host) prior to running this program.
 **/
public class Client {

    public static void main(String args[])  throws Exception {

	/*
	 * Obtain hostname supplied (optionally) as the first argument on
	 * the command line.
	 */
	String hostname = "localhost";
	if (args.length < 1) {
	    System.err.println(
		"usage: java [options] examples.activation.Client <hostname>");
	    System.exit(1);
	} else {
	    hostname = args[0];
	}

	/*
	 * Set a security manager, if one is not already set.
	 */
	if (System.getSecurityManager() == null) {
	    System.setSecurityManager(new SecurityManager());
	}

	/*
	 * Obtain the stub for the activatable object from the
	 * rmiregistry on port 1099 of the supplied host.  The name
	 * to look up is specified by the system property
	 * examples.activation.name.
	 */
	String name = System.getProperty("examples.activation.name");
	Registry registry = LocateRegistry.getRegistry(hostname);
	MyRemoteInterface stub =
	    (MyRemoteInterface) registry.lookup(name);
	System.err.println("Obtained stub from the registry.");
	
	/*
	 * Invoke the remote method using the stub.
	 */
	System.err.println("Invoking remote method...");
	
	String result = (String) stub.remoteMethod("hello there!");
	System.err.println("Returned from remote call.");
	System.err.println("Result: " + result);
    }
}