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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;

/**
 * A factory interface for creating {@link FileItem} instances. Factories
 * can provide their own custom configuration, over and above that provided
 * by the default file upload implementation.
 */
public interface FileItemFactory {

    /**
     * Create a new {@link FileItem} instance from the supplied parameters and
     * any local factory configuration.
     *
     * @param fieldName   The name of the form field.
     * @param contentType The content type of the form field.
     * @param isFormField true if this is a plain form field;
     *                    false otherwise.
     * @param fileName    The name of the uploaded file, if any, as supplied
     *                    by the browser or other client.
     *
     * @return The newly created file item.
     */
    FileItem createItem(
            String fieldName,
            String contentType,
            boolean isFormField,
            String fileName
            );

}