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JNLP Sample servlet that supports pack200 protocol. Taken from Sun's JDK sample/jnlp directory thanks to its permissive license.
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/*
 * @(#)VersionString.java	1.6 05/11/17
 * 
 * Copyright (c) 2006 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.
 */

package jnlp.sample.util;

import java.util.ArrayList;
import java.util.StringTokenizer;

/*
 * Utility class that knows to handle version strings
 * A version string is of the form:
 *
 *  (version-id ('+'?) ' ') *
 *
 */
public class VersionString
{
    private ArrayList _versionIds;

    /**
     * Constructs a VersionString object from string
     */
    public VersionString( String vs )
    {
        _versionIds = new ArrayList();
        if ( vs != null )
        {
            StringTokenizer st = new StringTokenizer( vs, " ", false );
            while ( st.hasMoreElements() )
            {
                // Note: The VersionID class takes care of a postfixed '+'
                _versionIds.add( new VersionID( st.nextToken() ) );
            }
        }
    }

    /**
     * Check if this VersionString object contains the VersionID m
     */
    public boolean contains( VersionID m )
    {
        for ( int i = 0; i < _versionIds.size(); i++ )
        {
            VersionID vi = (VersionID) _versionIds.get( i );
            boolean check = vi.match( m );
            if ( check )
            {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if this VersionString object contains the VersionID m, given as a string
     */
    public boolean contains( String versionid )
    {
        return contains( new VersionID( versionid ) );
    }

    /**
     * Check if this VersionString object contains anything greater than m
     */
    public boolean containsGreaterThan( VersionID m )
    {
        for ( int i = 0; i < _versionIds.size(); i++ )
        {
            VersionID vi = (VersionID) _versionIds.get( i );
            boolean check = vi.isGreaterThan( m );
            if ( check )
            {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if this VersionString object contains anything greater than the VersionID m, given as a string
     */
    public boolean containsGreaterThan( String versionid )
    {
        return containsGreaterThan( new VersionID( versionid ) );
    }

    /**
     * Check if the versionString 'vs' contains the VersionID 'vi'
     */
    static public boolean contains( String vs, String vi )
    {
        return ( new VersionString( vs ) ).contains( vi );
    }

    /**
     * Pretty-print object
     */
    public String toString()
    {
        StringBuffer sb = new StringBuffer();
        for ( int i = 0; i < _versionIds.size(); i++ )
        {
            sb.append( _versionIds.get( i ).toString() );
            sb.append( ' ' );
        }
        return sb.toString();
    }
}