httputil.java

JSPWiki,100%Java开发的一套完整WIKI程序

/* 
    JSPWiki - a JSP-based WikiWiki clone.

    Copyright (C) 2001-2003 Janne Jalkanen ([e-mail])

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2.1 of the License, or
    (at your option) any later version.

    This program 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.ecyrd.jspwiki.util;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.Cookie;

/**
 *  Contains useful utilities for some common HTTP tasks.
 *
 *  @author Janne Jalkanen
 *  @since 2.1.61.
 */
public class HttpUtil
{
    /**
     *  Attempts to retrieve the given cookie value from the request.
     *  Returns the string value (which may or may not be decoded
     *  correctly, depending on browser!), or null if the cookie is
     *  not found.
     *
     *  @param request The current request
     *  @param cookieName The name of the cookie to fetch.
     *  @return Value of the cookie, or null, if there is no such cookie.
     */

    public static String retrieveCookieValue( HttpServletRequest request, String cookieName )
    {
        Cookie[] cookies = request.getCookies();

        if( cookies != null )
        {
            for( int i = 0; i < cookies.length; i++ )
            {
                if( cookies[i].getName().equals( cookieName ) )
                {
                    return( cookies[i].getValue() );
                }
            }
        }

        return( null );
    }
}