getmethod.java

来自「Light in the box 抓取程序。 使用HttpClient」· Java 代码 · 共 130 行

/*
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/methods/GetMethod.java,v 1.29 2004/06/13 20:22:19 olegk Exp $
 * $Revision: 480424 $
 * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 *
 * ====================================================================
 *
 *  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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.commons.httpclient.methods;

import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Implements the HTTP GET method.
 * <p>
 * The HTTP GET method is defined in section 9.3 of
 * <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC2616</a>:
 * <blockquote>
 * The GET method means retrieve whatever information (in the form of an
 * entity) is identified by the Request-URI. If the Request-URI refers
 * to a data-producing process, it is the produced data which shall be
 * returned as the entity in the response and not the source text of the
 * process, unless that text happens to be the output of the process.
 * </blockquote>
 * </p>
 * <p>
 * GetMethods will follow redirect requests from the http server by default.
 * This behavour can be disabled by calling setFollowRedirects(false).</p>
 *
 * @author <a href="mailto:[e-mail]">Remy Maucherat</a>
 * @author Sung-Gu Park
 * @author Sean C. Sullivan
 * @author <a href="mailto:[e-mail]">Mike Bowler</a>
 * @author <a href="mailto:[e-mail]">Jeff Dever</a>
 * 
 * @version $Revision: 480424 $
 * @since 1.0
 */
public class GetMethod extends HttpMethodBase {

    // -------------------------------------------------------------- Constants

    /** Log object for this class. */
    private static final Log LOG = LogFactory.getLog(GetMethod.class);

    // ----------------------------------------------------------- Constructors

    /**
     * No-arg constructor.
     * 
     * @since 1.0
     */
    public GetMethod() {
        setFollowRedirects(true);
    }

    /**
     * Constructor specifying a URI.
     *
     * @param uri either an absolute or relative URI
     * 
     * @since 1.0
     */
    public GetMethod(String uri) {
        super(uri);
        LOG.trace("enter GetMethod(String)");
        setFollowRedirects(true);
    }

    // --------------------------------------------------------- Public Methods

    /**
     * Returns <tt>"GET"</tt>.
     * 
     * @return <tt>"GET"</tt>
     * 
     * @since 2.0
     */
    public String getName() {
        return "GET";
    }

    // ------------------------------------------------------------- Properties

    /**
     * Recycles the HTTP method so that it can be used again.
     * Note that all of the instance variables will be reset
     * once this method has been called. This method will also
     * release the connection being used by this HTTP method.
     * 
     * @see #releaseConnection()
     * 
     * @since 1.0
     * 
     * @deprecated no longer supported and will be removed in the future
     *             version of HttpClient
     */
    public void recycle() {
        LOG.trace("enter GetMethod.recycle()");

        super.recycle();
        setFollowRedirects(true);
    }

}