serveutils.java

java高级使用教程 全书一共分六章

// ServeUtils - static utilities for minimal Java HTTP server
//
// Copyright (C) 1996 by Jef Poskanzer <[e-mail]>.  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.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS 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 AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/

package Acme.Serve;

import java.io.*;
import java.util.*;
import Acme.Serve.servlet.*;
import Acme.Serve.servlet.http.*;

/// Static utilities for minimal Java HTTP server.
// <P>
// <A HREF="/resources/classes/Acme/Serve/ServeUtils.java">Fetch the software.</A><BR>
// <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>

public class ServeUtils
    {

    // Server identification.
    public static final String serverName = "Acme.Serve";
    public static final String serverVersion = "v1.7 of 13nov96";
    public static final String serverUrl = "http://www.acme.com/java/software/Acme.Serve.Serve.html";

    /// Write a standard-format HTML address for this server.
    public static void writeAddress( OutputStream o ) throws IOException
	{
	PrintStream p = new PrintStream( o );
	p.println(
	    "<ADDRESS><A HREF=\"" + serverUrl + "\">" +
	    serverName + " " + serverVersion + "</A></ADDRESS>" );
	}


    /// Get a cookie of a given name.
    public static String getCookie( HttpServletRequest req, String name )
	{
	String h = req.getHeader( "Cookie" );
	if ( h == null )
	    return null;
	StringTokenizer st = new StringTokenizer( h, "; " );
	while ( st.hasMoreTokens() )
	    {
	    String tk = st.nextToken();
	    int eq = tk.indexOf( '=' );
	    String n, v;
	    if ( eq == -1 )
		{
		n = tk;
		v = "";
		}
	    else
		{
		n = tk.substring( 0, eq );
		v = tk.substring( eq + 1 );
		}
	    if ( name.equals( n ) )
		return v;
	    }
	return null;
	}

    /// Set a cookie.
    public static void setCookie( HttpServletResponse res, String name, String value )
	{
	res.setHeader( "Set-Cookie", name + "=" + value );
	}

    }