?? servlets.java
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// Copyright (c) 2000 Just Objects B.V. <just@justobjects.nl>// Distributable under LGPL license. See terms of license at gnu.org.package nl.justobjects.pushlet.util;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet utilities. * * @author Just van den Broecke - Just Objects © * @version $Id: Servlets.java,v 1.2 2007/11/23 21:10:17 justb Exp $ */public class Servlets { /** * Get parameter; if not set or empty return null. */ public static String getParameter(HttpServletRequest aRequest, String aName) { return getParameter(aRequest, aName, null); } /** * Get parameter; if not set or empty return specified default value. */ public static String getParameter(HttpServletRequest aRequest, String aName, String aDefault) { String value = aRequest.getParameter(aName); if (value == null || value.length() == 0) { value = aDefault; } return value; } /** * Set HTTP headers to prevent caching. */ public static void setNoCacheHeaders(HttpServletResponse aResponse) { // Set to expire far in the past. aResponse.setHeader("Expires", "Sat, 6 May 1995 12:00:00 GMT"); // Set standard HTTP/1.1 no-cache headers. aResponse.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); // Set IE extended HTTP/1.1 no-cache headers (use addHeader). aResponse.addHeader("Cache-Control", "post-check=0, pre-check=0"); // Set standard HTTP/1.0 no-cache header. aResponse.setHeader("Pragma", "no-cache"); }}/* * $Log: Servlets.java,v $ * Revision 1.2 2007/11/23 21:10:17 justb * add hooks for custom logging (you can override DefaultLogger in pushlet.properties) * * Revision 1.1 2004/09/20 22:01:40 justb * more changes for new protocol * * */
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