browsercontrol.java

一个开源的基于java开发的数据库

package sql4j.util;

import java.io.IOException;

/**
 * A simple, static class to display a URL in the system browser.


 *
 * Under Unix, the system browser is hard-coded to be 'netscape'.
 * Netscape must be in your PATH for this to work. This has been
 * tested with the following platforms: AIX, HP-UX and Solaris.


 *
 * Under Windows, this will bring up the default browser under windows,
 * usually either Netscape or Microsoft IE. The default browser is
 * determined by the OS. This has been tested under Windows 95/98/NT.


 *
 * Examples:


	  * 
	 BrowserControl.displayURL("http://www.javaworld.com")
	  * 
	 BrowserControl.displayURL("file://c:\\docs\\index.html")
	  * 
	 BrowserContorl.displayURL("file:///user/joe/index.html");
	  * 


 * Note - you must include the url type -- either "http://" or
 * "file://".
 */
public class BrowserControl
{
	// 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 = "netscape4";
	
	private static final String UNIX_IEPATH = "/tmp/ie5/bin/iexplorer";

	// The flag to display a url.
	private static final String UNIX_FLAG = "-remote openURL";
	/**
	 * 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, int browser)
	{
		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
			{
				// browser==2 is iexplorer, browser==1 is netscape4
				if (browser==2) {
				  cmd = UNIX_IEPATH + " " + 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 = 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
	 */
	public static boolean isWindowsPlatform()
	{
		String os = System.getProperty("os.name");

		if ( os != null && os.startsWith(WIN_ID))
			return true;
		else
			return false;
	}
/**
 * Insert the method's description here.
 * Creation date: (4/19/01 6:37:42 PM)
 */
public static void main(String[] args) {
	BrowserControl.displayURL("http://www.cnn.com", 1);
}
}