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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.extend;

import java.io.IOException;

import org.directwebremoting.io.FileTransfer;

/**
 * A DownloadManager allows you to inject files into the system and then
 * retrieve them via a servlet at some later date. Implementations of
 * DownloadManager are responsible for defining a purge policy.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface DownloadManager
{
    /**
     * Inject a file into the system for later download.
     * @param transfer The representation of the file to inject
     * @return A URL for how to allow download of this data at a later time
     * @throws IOException If there are problems reading from the {@link FileTransfer}
     */
    String addFileTransfer(FileTransfer transfer) throws IOException;

    /**
     * Retrieve a FileGenerator given the id that it was stored under
     * @param id The id to lookup
     * @return The matching FileGenerator or null if no match was found
     * @throws IOException ...
     */
    FileTransfer getFileTransfer(String id) throws IOException;
}