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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 2002-2006 the original author or authors.
 *
 * 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.InputStream;

import javax.servlet.ServletInputStream;

/**
 * Delegating implementation of ServletInputStream.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DelegatingServletInputStream extends ServletInputStream
{
    /**
     * Create a new DelegatingServletInputStream.
     * @param proxy the sourceStream InputStream
     */
    public DelegatingServletInputStream(InputStream proxy)
    {
        this.proxy = proxy;
    }

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

    /**
     * @return The stream that we proxy to
     */
    public InputStream getSourceStream()
    {
        return proxy;
    }

    /* (non-Javadoc)
     * @see java.io.InputStream#read()
     */
    @Override
    public int read() throws IOException
    {
        return proxy.read();
    }

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

    private final InputStream proxy;
}