📄 oscacheservlet.java
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/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.oscache.web;import com.opensymphony.oscache.base.NeedsRefreshException;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.jsp.PageContext;/** * Servlet used to test the web portion of osCache. It performs the operations * received by parameter * * $Id: OscacheServlet.java,v 1.1.1.1 2003/07/17 20:28:08 chris_miller Exp $ * @version $Revision: 1.1.1.1 $ * @author <a href="mailto:fbeauregard@pyxis-tech.com">Francois Beauregard</a> * @author <a href="mailto:abergevin@pyxis-tech.com">Alain Bergevin</a> */public class OscacheServlet extends HttpServlet { /** Output content type */ private static final String CONTENT_TYPE = "text/html"; /** Clean up resources */ public void destroy() { } /** * Process the HTTP Get request * <p> * @param request The HTTP request * @param response The servlet response * @throws ServletException * @throws IOException */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { boolean varForceRefresh = false; int refreshPeriod = 0; int scope = PageContext.APPLICATION_SCOPE; String forceCacheUse = null; String key = null; // Cache item Long item; // Get the admin ServletCacheAdministrator admin = ServletCacheAdministrator.getInstance(getServletContext()); // Translate parameters try { String paramValue = request.getParameter("forceRefresh"); if ((paramValue != null) && (paramValue.length() > 0)) { varForceRefresh = Boolean.valueOf(paramValue).booleanValue(); } paramValue = request.getParameter("scope"); if ((paramValue != null) && (paramValue.length() > 0)) { scope = getScope(paramValue); } paramValue = request.getParameter("refreshPeriod"); if ((paramValue != null) && (paramValue.length() > 0)) { refreshPeriod = Integer.valueOf(paramValue).intValue(); } forceCacheUse = request.getParameter("forcecacheuse"); key = request.getParameter("key"); } catch (Exception e) { getServletContext().log("Error while retrieving the servlet parameters: " + e.toString()); } // Check if all the items should be flushed if (varForceRefresh) { admin.flushAll(); } try { // Get the data from the cache item = (Long) admin.getFromCache(scope, request, key, refreshPeriod); } catch (NeedsRefreshException nre) { // Check if we want to force the use of an item already in cache if ("yes".equals(forceCacheUse)) { admin.cancelUpdate(scope, request, key); item = (Long) nre.getCacheContent(); } else { item = new Long(System.currentTimeMillis()); admin.putInCache(scope, request, key, item); } } // Generate the output response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head><title>OscacheServlet</title></head>"); out.println("<body>"); out.println("<b>This is some cache content </b>: " + item.toString() + "<br>"); out.println("<b>Cache key</b>: " + admin.getCacheKey() + "<br>"); out.println("<b>Entry key</b>: " + admin.generateEntryKey("Test_key", request, scope) + "<br>"); out.println("</body></html>"); } /**Initialize global variables*/ public void init(ServletConfig config) throws ServletException { super.init(config); } /** * Return the scope number corresponding to it's string name */ private int getScope(String value) { if ((value != null) && (value.equalsIgnoreCase("session"))) { return PageContext.SESSION_SCOPE; } else { return PageContext.APPLICATION_SCOPE; } }}⌨️ 快捷键说明
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