Get Base Url for servlet : URL « Servlets « Java

1. Java
2. Servlets
3. URL

Get Base Url for servlet

 
/* 
 * Copyright (C) 2006 Methodhead Software LLC.  All rights reserved.
 * 
 * This file is part of TransferCM.
 * 
 * TransferCM is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * TransferCM 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 for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * TransferCM; if not, write to the Free Software Foundation, Inc., 51 Franklin St,
 * Fifth Floor, Boston, MA  02110-1301  USA
 */


import javax.servlet.http.HttpServletRequest;
import java.io.File;

public class ServletUtils {

  // constructors /////////////////////////////////////////////////////////////

  // constants ////////////////////////////////////////////////////////////////

  // classes //////////////////////////////////////////////////////////////////

  // methods //////////////////////////////////////////////////////////////////

  /**
   * NOT UNIT TESTED Returns the URL (including query parameters) minus the scheme, host, and
   * context path.  This method probably be moved to a more general purpose
   * class.
   */
  public static String getRelativeUrl(
    HttpServletRequest request ) {

    String baseUrl = null;

    if ( ( request.getServerPort() == 80 ) ||
         ( request.getServerPort() == 443 ) )
      baseUrl =
        request.getScheme() + "://" +
        request.getServerName() +
        request.getContextPath();
    else
      baseUrl =
        request.getScheme() + "://" +
        request.getServerName() + ":" + request.getServerPort() +
        request.getContextPath();

    StringBuffer buf = request.getRequestURL();

    if ( request.getQueryString() != null ) {
      buf.append( "?" );
      buf.append( request.getQueryString() );
    }

    return buf.substring( baseUrl.length() );
  }

  /**
   * NOT UNIT TESTED Returns the base url (e.g, <tt>http://myhost:8080/myapp</tt>) suitable for
   * using in a base tag or building reliable urls.
   */
  public static String getBaseUrl( HttpServletRequest request ) {
    if ( ( request.getServerPort() == 80 ) ||
         ( request.getServerPort() == 443 ) )
      return request.getScheme() + "://" +
             request.getServerName() +
             request.getContextPath();
    else
      return request.getScheme() + "://" +
             request.getServerName() + ":" + request.getServerPort() +
             request.getContextPath();
  }

  /**
   * Returns the file specified by <tt>path</tt> as returned by
   * <tt>ServletContext.getRealPath()</tt>.
   */
  public static File getRealFile(
    HttpServletRequest request,
    String path ) {

    return
      new File( request.getSession().getServletContext().getRealPath( path ) );
  }

  // properties ///////////////////////////////////////////////////////////////

  // attributes ///////////////////////////////////////////////////////////////
}

   
  

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