/* * 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.servlet;import java.io.IOException;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.apache.commons.fileupload.FileItemFactory;import org.apache.commons.fileupload.FileItemIterator;import org.apache.commons.fileupload.FileUpload;import org.apache.commons.fileupload.FileUploadException;/** * <p>High level API for processing file uploads.</p> * * <p>This class handles multiple files per single HTML widget, sent using * <code>multipart/mixed</code> encoding type, as specified by * <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>.  Use {@link * #parseRequest(HttpServletRequest)} to acquire a list of {@link * org.apache.commons.fileupload.FileItem}s associated with a given HTML * widget.</p> * * <p>How the data for individual parts is stored is determined by the factory * used to create them; a given part may be in memory, on disk, or somewhere * else.</p> * * @author <a href="mailto:Rafal.Krzewski@e-point.pl">Rafal Krzewski</a> * @author <a href="mailto:dlr@collab.net">Daniel Rall</a> * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> * @author <a href="mailto:jmcnally@collab.net">John McNally</a> * @author <a href="mailto:martinc@apache.org">Martin Cooper</a> * @author Sean C. Sullivan * * @version $Id: ServletFileUpload.java 479484 2006-11-27 01:06:53Z jochen $ */public class ServletFileUpload extends FileUpload {    // ---------------------------------------------------------- Class methods    /**     * Utility method that determines whether the request contains multipart     * content.     *     * @param request The servlet request to be evaluated. Must be non-null.     *     * @return <code>true</code> if the request is multipart;     *         <code>false</code> otherwise.     */    public static final boolean isMultipartContent(            HttpServletRequest request) {        if (!"post".equals(request.getMethod().toLowerCase())) {            return false;        }        String contentType = request.getContentType();        if (contentType == null) {            return false;        }        if (contentType.toLowerCase().startsWith(MULTIPART)) {            return true;        }        return false;    }    // ----------------------------------------------------------- Constructors    /**     * Constructs an uninitialised instance of this class. A factory must be     * configured, using <code>setFileItemFactory()</code>, before attempting     * to parse requests.     *     * @see FileUpload#FileUpload(FileItemFactory)     */    public ServletFileUpload() {        super();    }    /**     * Constructs an instance of this class which uses the supplied factory to     * create <code>FileItem</code> instances.     *     * @see FileUpload#FileUpload()     * @param fileItemFactory The factory to use for creating file items.     */    public ServletFileUpload(FileItemFactory fileItemFactory) {        super(fileItemFactory);    }    // --------------------------------------------------------- Public methods    /**     * Processes an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>     * compliant <code>multipart/form-data</code> stream.     *     * @param request The servlet request to be parsed.     *     * @return A list of <code>FileItem</code> instances parsed from the     *         request, in the order that they were transmitted.     *     * @throws FileUploadException if there are problems reading/parsing     *                             the request or storing files.     */    public List /* FileItem */ parseRequest(HttpServletRequest request)    throws FileUploadException {        return parseRequest(new ServletRequestContext(request));    }    /**     * Processes an <a href="http://www.ietf.org/rfc/rfc1867.txt">RFC 1867</a>     * compliant <code>multipart/form-data</code> stream.     *     * @param request The servlet request to be parsed.     *     * @return An iterator to instances of <code>FileItemStream</code>     *         parsed from the request, in the order that they were     *         transmitted.     *     * @throws FileUploadException if there are problems reading/parsing     *                             the request or storing files.     * @throws IOException An I/O error occurred. This may be a network     *   error while communicating with the client or a problem while     *   storing the uploaded content.     */    public FileItemIterator getItemIterator(HttpServletRequest request)    throws FileUploadException, IOException {        return super.getItemIterator(new ServletRequestContext(request));    }}