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The Apache Commons FileUpload component provides a simple yet flexible means of adding support for multipart file upload functionality to servlets and web applications.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.fileupload;

import java.util.Iterator;

/**
 *  This class provides support for accessing the headers for a file or form
 * item that was received within a multipart/form-data POST
 * request.
 *
 * @since 1.2.1
 */
public interface FileItemHeaders {

    /**
     * Returns the value of the specified part header as a String.
     *
     * If the part did not include a header of the specified name, this method
     * return null.  If there are multiple headers with the same
     * name, this method returns the first header in the item.  The header
     * name is case insensitive.
     *
     * @param name a String specifying the header name
     * @return a String containing the value of the requested
     *         header, or null if the item does not have a header
     *         of that name
     */
    String getHeader(String name);

    /**
     * 
     * Returns all the values of the specified item header as an
     * Iterator of String objects.
     * 
     * 
     * If the item did not include any headers of the specified name, this
     * method returns an empty Iterator. The header name is
     * case insensitive.
     * 
     *
     * @param name a String specifying the header name
     * @return an Iterator containing the values of the
     *         requested header. If the item does not have any headers of
     *         that name, return an empty Iterator
     */
    Iterator getHeaders(String name);

    /**
     * 
     * Returns an Iterator of all the header names.
     * 
     *
     * @return an Iterator containing all of the names of
     *         headers provided with this file item. If the item does not have
     *         any headers return an empty Iterator
     */
    Iterator getHeaderNames();

}