Java tutorial
/** * ========================================================================================== * = JAHIA'S DUAL LICENSING - IMPORTANT INFORMATION = * ========================================================================================== * * http://www.jahia.com * * Copyright (C) 2002-2017 Jahia Solutions Group SA. All rights reserved. * * THIS FILE IS AVAILABLE UNDER TWO DIFFERENT LICENSES: * 1/GPL OR 2/JSEL * * 1/ GPL * ================================================================================== * * IF YOU DECIDE TO CHOOSE THE GPL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS: * * This program 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 3 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * * 2/ JSEL - Commercial and Supported Versions of the program * =================================================================================== * * IF YOU DECIDE TO CHOOSE THE JSEL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS: * * Alternatively, commercial and supported versions of the program - also known as * Enterprise Distributions - must be used in accordance with the terms and conditions * contained in a separate written agreement between you and Jahia Solutions Group SA. * * If you are unsure which license is appropriate for your use, * please contact the sales department at sales@jahia.com. */ package org.jahia.bundles.extender.jahiamodules; import org.apache.commons.lang.StringUtils; import org.apache.jasper.Constants; import org.apache.jasper.servlet.JspServlet; import org.ops4j.pax.swissbox.core.ContextClassLoaderUtils; import org.springframework.web.servlet.DispatcherServlet; import org.springframework.web.servlet.LocaleResolver; import javax.servlet.*; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; import java.net.URLClassLoader; import java.util.Locale; import java.util.concurrent.Callable; /** * A wrapper for the JspServlet class from Pax Web, but that will actually allow sharing of the JspServlet and * class loader instances. */ public class JspServletWrapper implements Servlet { private final JspServlet jspServlet; private final URLClassLoader urlClassLoader; private final String jspFile; private boolean performInit; private String jspFilePrefix; public JspServletWrapper(JspServlet jspServlet, URLClassLoader urlClassLoader, String jspFile, String jspFilePrefix, boolean performInit) { this.jspServlet = jspServlet; this.urlClassLoader = urlClassLoader; this.jspFile = jspFile; this.jspFilePrefix = jspFilePrefix; this.performInit = performInit; } @Override public void init(final ServletConfig config) throws ServletException { if (performInit) { try { ContextClassLoaderUtils.doWithClassLoader(urlClassLoader, new Callable<Void>() { public Void call() throws Exception { jspServlet.init(config); return null; } }); } catch (Exception e) { throw new ServletException("Error during servlet init", e); } } } @Override public ServletConfig getServletConfig() { return jspServlet.getServletConfig(); } @Override public void service(final ServletRequest req, final ServletResponse res) throws ServletException, IOException { String jspPath = getJspFilePath(req); if (jspPath != null) { req.setAttribute(Constants.JSP_FILE, jspPath); } Object currentLocaleResolver = req.getAttribute(DispatcherServlet.LOCALE_RESOLVER_ATTRIBUTE); req.setAttribute(DispatcherServlet.LOCALE_RESOLVER_ATTRIBUTE, new LocaleResolver() { @Override public Locale resolveLocale(HttpServletRequest request) { HttpSession session = request.getSession(); if (session != null) { Locale currentLocale = (Locale) session.getAttribute(org.jahia.api.Constants.SESSION_LOCALE); if (currentLocale != null) { return currentLocale; } } return request.getLocale(); } @Override public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) { } }); // Prepare attributes for subsequent includes String p = (String) req.getAttribute("javax.servlet.include.servlet_path") + (String) req.getAttribute("javax.servlet.include.path_info"); req.setAttribute("javax.servlet.include.path_info", null); req.setAttribute("javax.servlet.include.servlet_path", p); try { ContextClassLoaderUtils.doWithClassLoader(urlClassLoader, new Callable<Void>() { public Void call() throws Exception { jspServlet.service(req, res); return null; } }); } catch (Exception e) { throw new ServletException("Error during servlet servicing", e); } req.setAttribute(DispatcherServlet.LOCALE_RESOLVER_ATTRIBUTE, currentLocaleResolver); } private String getJspFilePath(final ServletRequest req) { String jspPath = jspFile; if (jspPath == null && jspFilePrefix != null && req instanceof HttpServletRequest) { HttpServletRequest httpRequest = (HttpServletRequest) req; String servletPath = StringUtils.defaultIfEmpty( (String) httpRequest.getAttribute("javax.servlet.include.servlet_path"), httpRequest.getServletPath()); String pathInfo = StringUtils.defaultIfEmpty( (String) httpRequest.getAttribute("javax.servlet.include.path_info"), httpRequest.getPathInfo()); if (pathInfo != null && servletPath != null && "/modules".equals(servletPath) && pathInfo.startsWith(jspFilePrefix) && pathInfo.length() > jspFilePrefix.length()) { jspPath = pathInfo.substring(jspFilePrefix.length()); } } return jspPath; } @Override public String getServletInfo() { return jspServlet.getServletInfo(); } @Override public void destroy() { // we never destroy the JSP servlet here, we do it at a higher level. } }