Java example source code file (HttpOutputStream.java)

This example Java source code file (HttpOutputStream.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytearrayoutputstream, content-length, content\-type, dataoutputstream, httpoutputstream, ioexception

The HttpOutputStream.java Java example source code

/*
 * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package sun.rmi.transport.proxy;

import java.io.*;

/**
 * The HttpOutputStream class assists the HttpSendSocket and HttpReceiveSocket
 * classes by providing an output stream that buffers its entire input until
 * closed, and then it sends the complete transmission prefixed by the end of
 * an HTTP header that specifies the content length.
 */
class HttpOutputStream extends ByteArrayOutputStream {

    /** the output stream to send response to */
    protected OutputStream out;

    /** true if HTTP response has been sent */
    boolean responseSent = false;

    /**
     * Begin buffering new HTTP response to be sent to a given stream.
     * @param out the OutputStream to send response to
     */
    public HttpOutputStream(OutputStream out) {
        super();
        this.out = out;
    }

    /**
     * On close, send HTTP-packaged response.
     */
    public synchronized void close() throws IOException {
        if (!responseSent) {
            /*
             * If response would have zero content length, then make it
             * have some arbitrary data so that certain clients will not
             * fail because the "document contains no data".
             */
            if (size() == 0)
                write(emptyData);

            DataOutputStream dos = new DataOutputStream(out);
            dos.writeBytes("Content-type: application/octet-stream\r\n");
            dos.writeBytes("Content-length: " + size() + "\r\n");
            dos.writeBytes("\r\n");
            writeTo(dos);
            dos.flush();
            // Do not close the underlying stream here, because that would
            // close the underlying socket and prevent reading a response.
            reset(); // reset byte array
            responseSent = true;
        }
    }

    /** data to send if the response would otherwise be empty */
    private static byte[] emptyData = { 0 };
}