httppost.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 *  Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 *  reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the
 *  distribution.
 *
 *  3. The end-user documentation included with the redistribution,
 *  if any, must include the following acknowledgment:
 *  "This product includes software developed by the
 *  Sun Microsystems, Inc. for Project JXTA."
 *  Alternately, this acknowledgment may appear in the software itself,
 *  if and wherever such third-party acknowledgments normally appear.
 *
 *  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *  must not be used to endorse or promote products derived from this
 *  software without prior written permission. For written
 *  permission, please contact Project JXTA at http://www.jxta.org.
 *
 *  5. Products derived from this software may not be called "JXTA",
 *  nor may "JXTA" appear in their name, without prior written
 *  permission of Sun.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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 *  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *  ====================================================================
 *
 *  This software consists of voluntary contributions made by many
 *  individuals on behalf of Project JXTA.  For more
 *  information on Project JXTA, please see
 *  <http://www.jxta.org/>.
 *
 *  This license is based on the BSD license adopted by the Apache Foundation.
 *
 *  $Id: HttpPost.java,v 1.7 2005/12/14 22:33:24 gonzo Exp $
 */
package net.jxta.ext.http;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

import java.net.URL;

/**
 * HTTP Post {@link net.jxta.ext.http.Dispatchable} implemetation.
 *
 * @author     james todd [gonzo at jxta dot org]
 */

public class HttpPost
    extends HttpGet {

    static {
        headers.put(Message.ACCEPT_CHARSET, Message.CHARSET);
        headers.put(Message.CONTENT_TYPE, Message.URL_FORM_ENCODED);
    }

    /**
     * Default constructor.
     */
    
    public HttpPost() {
        this(null);
    }

    /**
     * Constructor which specifies the destination {@link java.net.URL} address.
     *
     * @param       url     destination {@link java.net.URL} address
     */
    
    public HttpPost(URL url) {
        this(url, null);
    }

    /**
     * Constructor which specifies the destination {@link java.net.URL} address
     * and outbound {@link net.jxta.ext.http.Message}.
     *
     * @param       url     destination {@link java.net.URL} address
     * @param       msg     outbound {@link net.jxta.ext.http.Message}
     */
    
    public HttpPost(URL url, Message msg) {
        super(url, msg);

        this.method = Message.POST;
    }

    /**
     * Establish the HTTP connection passing the outbound {@link net.jxta.ext.http.Message} and
     * returning the corresponding {@link net.jxta.ext.http.Message} response.
     *
     * @return          response {@link net.jxta.ext.http.Message}
     */
    
    public Message dispatch()
    throws IOException {
        URL u = getURL();

        this.connection = openConnection(u);

        doGet();
        doPost();

        Message response = getResponse(u);

        closeConnection();

        return response;
    }

    /**
     * HTTP Post implementation.
     */
    
    protected void doPost()
    throws IOException {
        Message msg = getMessage();

        if (super.method == Message.POST &&
            msg != null &&
            msg.hasBody()) {
            BufferedWriter bw = null;
            boolean isError = false;

            try {
                char[] buf = msg.getBody().toCharArray();
                OutputStreamWriter osw =
                    new OutputStreamWriter(this.connection.getOutputStream());
                int l = BLOCK;
                int c = 0;
                int m = buf.length;

                bw = new BufferedWriter(osw);

                while ((c * BLOCK) < m) {
                    if (((c + l) * BLOCK) > m) {
                        l = m - c * BLOCK;
                    }

                    bw.write(buf, c++ * BLOCK, l);
                }
            } catch (Exception e) {
                isError = true;
            }

            if (bw != null) {
                bw.flush();
                bw.close();
            }

            if (isError) {
                throw new IOException();
            }
        }
    }
}