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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.util;

import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletOutputStream;

/**
 * Delegating implementation of ServletOutputStream.
 */
public class DelegatingServletOutputStream extends ServletOutputStream
{
    /**
     * Create a new DelegatingServletOutputStream.
     * @param proxy the target OutputStream
     */
    public DelegatingServletOutputStream(OutputStream proxy)
    {
        this.proxy = proxy;
    }

    /**
     * Accessor for the stream that we are proxying to
     * @return The stream we proxy to
     */
    public OutputStream getTargetStream()
    {
        return proxy;
    }

    /* (non-Javadoc)
     * @see java.io.OutputStream#write(int)
     */
    @Override
    public void write(int b) throws IOException
    {
        proxy.write(b);
    }

    /* (non-Javadoc)
     * @see java.io.OutputStream#flush()
     */
    @Override
    public void flush() throws IOException
    {
        super.flush();
        proxy.flush();
    }

    /* (non-Javadoc)
     * @see java.io.OutputStream#close()
     */
    @Override
    public void close() throws IOException
    {
        super.close();
        proxy.close();
    }

    private final OutputStream proxy;
}