Java tutorial
/* * 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.shindig.protocol.multipart; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import java.io.IOException; import java.net.UnknownServiceException; import java.util.Collection; import java.util.List; import javax.servlet.http.HttpServletRequest; import com.google.common.collect.Lists; /** * Implementation of MultipartFormParser using Apache Commons file upload. */ public class DefaultMultipartFormParser implements MultipartFormParser { private static final String MULTIPART = "multipart/"; public Collection<FormDataItem> parse(HttpServletRequest servletRequest) throws IOException { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { @SuppressWarnings("unchecked") List<FileItem> fileItems = upload.parseRequest(servletRequest); return convertToFormData(fileItems); } catch (FileUploadException e) { UnknownServiceException use = new UnknownServiceException("File upload error."); use.initCause(e); throw use; } } private Collection<FormDataItem> convertToFormData(List<FileItem> fileItems) { List<FormDataItem> formDataItems = Lists.newArrayListWithCapacity(fileItems.size()); for (FileItem item : fileItems) { formDataItems.add(new CommonsFormDataItem(item)); } return formDataItems; } public boolean isMultipartContent(HttpServletRequest request) { if (!"POST".equals(request.getMethod())) { return false; } String contentType = request.getContentType(); if (contentType == null) { return false; } return contentType.toLowerCase().startsWith(MULTIPART); } }