tomcatwait.java

java 写的一个新闻发布系统

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//    _______|  /--|    |    |    -   \  _    |    :    -   \_________
//   \\______: :---|    :    :           |    :    |         \________>
//           |__\---\_____________:______:    :____|____:_____\
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//              . . . i n   j a h i a   w e   t r u s t . . .
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package org.jahia.init;

import java.io.InputStream;
import java.io.PrintStream;
import java.net.URL;

/**
 * <p>Title: Tomcat waiting utility</p>
 * <p>Description: Small standalone utility to wait until the Tomcat web server
 * has finished initializing before going on with the startup script.</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author Serge Huber
 * @version 1.0
 */

public class TomcatWait
{
    private static final String DEFAULT_TARGET_URL = "http://localhost:8080/jahia/html/startup/startjahia.html";

    public static void main(String args[])
    {
        String targetURL = DEFAULT_TARGET_URL;
        if (args.length == 0) {
            System.out.println("Missing targetURL, defaulting to " + DEFAULT_TARGET_URL);
        } else {
            targetURL = args[0];
        }
        URL url = null;
        try
        {
            url = new URL(targetURL);
        }
        catch(Throwable throwable)
        {
            System.out.println("Error in URL parameter : " + targetURL);
            throwable.printStackTrace();
            return;
        }
        boolean flag = false;
        System.out.print("Waiting for Web Server to become available at " + targetURL + ".");
        try {
            Thread.sleep(1000); // sleep 1 second before making the connection
        } catch (InterruptedException ie) {
            ie.printStackTrace();
        }
        while(!flag) {
            System.out.print(".");
            try {
                Thread.sleep(500); // sleep 500 ms between tries.
            } catch (InterruptedException ie) {
                ie.printStackTrace();
            }

            try
            {
                InputStream inputstream = url.openStream();
                flag = true;
                inputstream.close();
            }
            catch(Throwable throwable1)
            {
                flag = false;
            }
        }
        System.out.println("");
        System.out.println("Web Server now available.");
    }
}