webhandler.java

编写程序

/*
 * @(#)WebHandler.java	1.5 03/12/19
 * 
 * Copyright (c) 2004 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:
 * 
 * -Redistribution 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 MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST 
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY 
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, 
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

import javax.jnlp.BasicService;
import javax.jnlp.ServiceManager;
import javax.jnlp.UnavailableServiceException;
import java.io.*;
import java.net.*;

public class WebHandler {
    
    
    static private BasicService _bs = null;
    
    static public boolean isEnabled() {
	return true;
    }
    
    static public void publish(String txt) {
	// Construct POST request (Heavily inspired from
	// JavaWorld TIP 34)
	URL url = getPublishURL();
	
	try {
	    URLConnection urlConn = url.openConnection();
	    // Let the run-time system (RTS) know that we want input.
	    urlConn.setDoInput (true);
	    // Let the RTS know that we want to do output.
	    urlConn.setDoOutput (true);
	    // No caching, we want the real thing.
	    urlConn.setUseCaches (false);
	    // Specify the content type.
	    urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
	    
	    // Send POST output.
	    DataOutputStream printout = new DataOutputStream (urlConn.getOutputStream());
	    String content = "contents=" + URLEncoder.encode(txt);
	    printout.writeBytes(content);
	    printout.flush ();
	    printout.close ();
	    
	    // Get response data.
	    DataInputStream input = new DataInputStream (urlConn.getInputStream ());
	    String str;
	    while (null != ((str = input.readLine()))) {
		System.out.println (str);
	    }
	    input.close ();
	} catch(IOException ioe) {
	    ioe.printStackTrace(System.out);
	}
    };
    
    static public void show() {
	initialize();
	_bs.showDocument(getPublishURL());
    };
    
    static private URL getPublishURL() {
	String location = System.getProperty("jnlp.publish-url");
	System.out.println(location);
	try {
	    return new URL(location);
	} catch(MalformedURLException mue) {
	    mue.printStackTrace(System.out);
	    return null;
	}
    }
    
    static private synchronized void initialize() {
	if (_bs != null) return;
	try {
	    _bs  = (BasicService)ServiceManager.lookup("javax.jnlp.BasicService");
	} catch(UnavailableServiceException e) {
            _bs = null;
	}
    }
}