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.commons.vfs2.provider.http; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.vfs2.Capability; import org.apache.commons.vfs2.FileName; import org.apache.commons.vfs2.FileSystem; import org.apache.commons.vfs2.FileSystemConfigBuilder; import org.apache.commons.vfs2.FileSystemException; import org.apache.commons.vfs2.FileSystemOptions; import org.apache.commons.vfs2.UserAuthenticationData; import org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider; import org.apache.commons.vfs2.provider.GenericFileName; import org.apache.commons.vfs2.util.UserAuthenticatorUtils; /** * An HTTP provider that uses commons-httpclient. */ public class HttpFileProvider extends AbstractOriginatingFileProvider { /** Authenticator information. */ public static final UserAuthenticationData.Type[] AUTHENTICATOR_TYPES = new UserAuthenticationData.Type[] { UserAuthenticationData.USERNAME, UserAuthenticationData.PASSWORD }; static final Collection<Capability> capabilities = Collections .unmodifiableCollection(Arrays.asList(new Capability[] { Capability.GET_TYPE, Capability.READ_CONTENT, Capability.URI, Capability.GET_LAST_MODIFIED, Capability.ATTRIBUTES, Capability.RANDOM_ACCESS_READ, Capability.DIRECTORY_READ_CONTENT, })); /** * Constructs a new provider. */ public HttpFileProvider() { super(); setFileNameParser(HttpFileNameParser.getInstance()); } /** * Creates a {@link FileSystem}. */ @Override protected FileSystem doCreateFileSystem(final FileName name, final FileSystemOptions fileSystemOptions) throws FileSystemException { // Create the file system final GenericFileName rootName = (GenericFileName) name; UserAuthenticationData authData = null; HttpClient httpClient; try { authData = UserAuthenticatorUtils.authenticate(fileSystemOptions, AUTHENTICATOR_TYPES); httpClient = HttpClientFactory.createConnection(rootName.getScheme(), rootName.getHostName(), rootName.getPort(), UserAuthenticatorUtils .toString(UserAuthenticatorUtils.getData(authData, UserAuthenticationData.USERNAME, UserAuthenticatorUtils.toChar(rootName.getUserName()))), UserAuthenticatorUtils .toString(UserAuthenticatorUtils.getData(authData, UserAuthenticationData.PASSWORD, UserAuthenticatorUtils.toChar(rootName.getPassword()))), fileSystemOptions); } finally { UserAuthenticatorUtils.cleanup(authData); } return new HttpFileSystem(rootName, httpClient, fileSystemOptions); } @Override public FileSystemConfigBuilder getConfigBuilder() { return HttpFileSystemConfigBuilder.getInstance(); } @Override public Collection<Capability> getCapabilities() { return capabilities; } }