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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 boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.io;

import java.io.IOException;
import java.io.InputStream;

import org.directwebremoting.extend.SimpleInputStreamFactory;

/**
 * This class gives some lifecycle to an InputStream.
 * There may be times (particularly with downloading files to browsers) when it
 * is not clear if the data will ever be read.
 * A call to {@link #getInputStream()} is a signal that we really to want data
 * now and that if any processing is needed, if should be done.
 * A call to {@link #close()} is a signal that whether or not getInputStream was
 * called, the data is no longer required.
 * {@link SimpleInputStreamFactory}.
 * @see SimpleInputStreamFactory
 * @author Lance Semmens [uklance at gmail dot com]
 */
public interface InputStreamFactory
{
    /**
     * Gets an input stream. This function should be called only once.
     * @return ...
     * @throws IOException ...
     */
    InputStream getInputStream() throws IOException;

    /**
     * Whether or not this resource has been read from, this should be called
     * to indicate that the resources are no longer required.
     * @throws IOException ...
     */
    void close() throws IOException;
}