unzip a jar file from a war file to tomcat/webapp

[Paul Hammes <Pa...@gmx.de>]

Hi,

i have to unzip a jar, contained in a war file. This jar file is contained in the web-inf/lib directory. There are several images in this jar and i want to unzip it to tomcat/webapp directory so the browser can access the images directly. The process of unzipping should be triggerd by the automatic deploy of the war file by tomcat.

How can I manage to do this?

Thanks

Paul
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Re: unzip a jar file from a war file to tomcat/webapp

[Christopher Schultz <ch...@christopherschultz.net>]

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Paul,

Paul Hammes wrote:
> i have to unzip a jar, contained in a war file. This jar file is
> contained in the web-inf/lib directory. There are several images in
> this jar and i want to unzip it to tomcat/webapp directory so the
> browser can access the images directly. The process of unzipping
> should be triggered by the automatic deploy of the war file by tomcat.

I'm not sure if you can actually listen for "auto-deploy" events, but
you can certainly listen for an "app is ready" events by using a
ServletContextListener.

When the context is initialized, you can open your JAR file like this:

private static final String JAR = "/WEB-INF/lib/my.jar";

public void contextInitialized(ServletContextEvent evt)
{
    InputStream in = null;
    JarInputStream jin = null;

    try
    {
        evt.getServletContext().getResourceAsStream(JAR);

    	if(null != in)
    	{
            jin = new JarInputStream(in);

	    // Do whatever you need to do with your JAR file.
        }
        else
        {
            logger.warn("Can't open JAR file");
        }
    }
    finally
    {
        if(null != jin) try { jin.close(); jin = in = null; }
                        catch(IOException ioe) { logger.error(ioe); }
        if(null != in) try { in.close(); }
                       catch(IOException ioe) { logger.error(ioe); }
    }
}

Don't forget to close that JAR file, even if you have to use the
contextDestroyed if you need to hold the JAR file open for the life of
the context.

Just out of curiosity, why do you need to open your own JAR file?

Hope that helps,
- -chris
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