browsercontrol.java

一个用于排队系统仿真的开源软件,有非常形象的图象仿真过程!

/**    
  * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.

  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.

  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
package jmt.gui.exact.utils;

import java.io.IOException;

/**

 * @author alyf (Andrea Conti)
 * Date: 20-set-2003
 * Time: 21.56.13

 */


/**
 * A class to open links in an external browser window. By Steven Spencer.<br>
 * See <a href="http://www.javaworld.com/javaworld/javatips/jw-javatip66.html">http://www.javaworld.com/javaworld/javatips/jw-javatip66.html</a>
 */
public class BrowserControl {
	/**
	 * Display a file in the system browser.  If you want to display a
	 * file, you must include the absolute path name.
	 *
	 * @param url the file's url (the url must start with either "http://" or
	 * "file://").
	 */
	public static void displayURL(String url) {
		boolean windows = isWindowsPlatform();
		String cmd = null;
		try {
			if (windows) {
				// cmd = 'rundll32 url.dll,FileProtocolHandler http://...'
				cmd = WIN_PATH + " " + WIN_FLAG + " " + url;
				Process p = Runtime.getRuntime().exec(cmd);
			} else {
				// Under Unix, Netscape has to be running for the "-remote"
				// command to work.  So, we try sending the command and
				// check for an exit value.  If the exit command is 0,
				// it worked, otherwise we need to start the browser.
				// cmd = 'netscape -remote openURL(http://www.javaworld.com)'
				cmd = UNIX_PATH + " " + UNIX_FLAG + "(" + url + ")";
				Process p = Runtime.getRuntime().exec(cmd);
				try {
					// wait for exit code -- if it's 0, command worked,
					// otherwise we need to start the browser up.
					int exitCode = p.waitFor();
					if (exitCode != 0) {
						// Command failed, start up the browser
						// cmd = 'netscape http://www.javaworld.com'
						cmd = UNIX_PATH + " " + url;
						p = Runtime.getRuntime().exec(cmd);
					}
				} catch (InterruptedException x) {
					System.err.println("Error bringing up browser, cmd='" +
					        cmd + "'");
					System.err.println("Caught: " + x);
				}
			}
		} catch (IOException x) {
			// couldn't exec browser
			System.err.println("Could not invoke browser, command=" + cmd);
			System.err.println("Caught: " + x);
		}
	}

	/**
	 * Try to determine whether this application is running under Windows
	 * or some other platform by examing the "os.name" property.
	 *
	 * @return true if this application is running under a Windows OS
	 */
	private static boolean isWindowsPlatform() {
		String os = System.getProperty("os.name");
		if (os != null && os.startsWith(WIN_ID))
			return true;
		else
			return false;

	}

	// Used to identify the windows platform.
	private static final String WIN_ID = "Windows";
	// The default system browser under windows.
	private static final String WIN_PATH = "rundll32";
	// The flag to display a url.
	private static final String WIN_FLAG = "url.dll,FileProtocolHandler";
	// The default browser under unix.
	private static final String UNIX_PATH = "netscape";
	// The flag to display a url.
	private static final String UNIX_FLAG = "-remote openURL";
}