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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.dwrp;

import java.io.IOException;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.directwebremoting.extend.FormField;
import org.directwebremoting.extend.ServerException;

/**
 * An interface to allow us to plug alternative FileUpload components into DWR,
 * and more specifically, to plug in a null implementation if file commons
 * file-upload.jar is not available on the classpath.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface FileUpload
{
    /**
     * Process an inbound request into a set of name/value pairs where the
     * values could be file uploads.
     * @param req The request to parse
     * @return A map of the fields in the input request
     * @throws ServerException If there is an {@link IOException} while reading the request
     */
    public Map parseRequest(HttpServletRequest req) throws ServerException;
}