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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.extend;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ConvertUtil
{
    /**
     * splitInbound() returns the type info in this parameter
     */
    public static final int INBOUND_INDEX_TYPE = 0;

    /**
     * splitInbound() returns the value info in this parameter
     */
    public static final int INBOUND_INDEX_VALUE = 1;

    /**
     * The javascript outbound marshaller prefixes the toString value with a
     * colon and the original type information. This undoes that.
     * @param data The string to be split up
     * @return A string array containing the split data
     */
    public static String[] splitInbound(String data)
    {
        String[] reply = new String[2];
    
        int colon = data.indexOf(ProtocolConstants.INBOUND_TYPE_SEPARATOR);
        if (colon == -1)
        {
            log.error("Missing : in conversion data (" + data + ')');
            reply[INBOUND_INDEX_TYPE] = ProtocolConstants.TYPE_STRING;
            reply[INBOUND_INDEX_VALUE] = data;
        }
        else
        {
            reply[INBOUND_INDEX_TYPE] = data.substring(0, colon);
            reply[INBOUND_INDEX_VALUE] = data.substring(colon + 1);
        }
    
        return reply;
    }

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(ConvertUtil.class);
}