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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.impl;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * A way to convert {@link BufferedImage}s to files so they can be written
 * using a FileServingServlet or similar.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class InputStreamFileGenerator extends AbstractFileGenerator
{
    /**
     * Setup the image to convert
     * @param in the data to stream
     * @param mimeType The mime type to convert the image into
     */
    public InputStreamFileGenerator(InputStream in, String filename, String mimeType)
    {
        super(filename, mimeType);
        this.in = in;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.DownloadManager.FileGenerator#generateFile(java.io.OutputStream)
     */
    public void generateFile(OutputStream out) throws IOException
    {
        byte[] buffer = new byte[1024];
        while (true)
        {
            int length = in.read(buffer);
            if (length == -1)
            {
                break;
            }
            out.write(buffer, 0, length);
        }
    }

    /**
     * The stream that we are about to export
     */
    protected final InputStream in;
}