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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.convert;

import java.sql.Time;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;

import org.directwebremoting.dwrp.ProtocolConstants;
import org.directwebremoting.extend.Converter;
import org.directwebremoting.extend.InboundContext;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.MarshallException;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;

/**
 * An implementation of Converter for Dates.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DateConverter extends BaseV20Converter implements Converter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable data, InboundContext inctx) throws MarshallException
    {
        String value = data.getValue();

        // If the text is null then the whole bean is null
        if (value.trim().equals(ProtocolConstants.INBOUND_NULL))
        {
            return null;
        }

        try
        {
            long millis = 0;
            if (value.length() > 0)
            {
                millis = Long.parseLong(value);
            }

            Date date = new Date(millis);
            if (paramType == Date.class)
            {
                return date;
            }
            else if (paramType == java.sql.Date.class)
            {
                return new java.sql.Date(date.getTime());
            }
            else if (paramType == Time.class)
            {
                return new Time(date.getTime());
            }
            else if (paramType == Timestamp.class)
            {
                return new Timestamp(date.getTime());
            }
            else if (paramType == Calendar.class)
            {
                Calendar cal = Calendar.getInstance();
                cal.setTime(date);
                return cal;
            }
            else
            {
                throw new MarshallException(paramType);
            }
        }
        catch (MarshallException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw new MarshallException(paramType, ex);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws MarshallException
    {
        long millis;

        if (data instanceof Calendar)
        {
            Calendar cal = (Calendar) data;
            millis = cal.getTime().getTime();
        }
        else if (data instanceof Date)
        {
            Date date = (Date) data;
            millis = date.getTime();
        }
        else
        {
            throw new MarshallException(data.getClass());
        }

        return new NonNestedOutboundVariable("new Date(" + millis + ")");
    }
}