| // |
| // ======================================================================== |
| // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.servlets; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.RequestDispatcher; |
| import javax.servlet.ServletContext; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| /* ------------------------------------------------------------ */ |
| /** Concatenation Servlet |
| * This servlet may be used to concatenate multiple resources into |
| * a single response. It is intended to be used to load multiple |
| * javascript or css files, but may be used for any content of the |
| * same mime type that can be meaningfully concatenated. |
| * <p> |
| * The servlet uses {@link RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)} |
| * to combine the requested content, so dynamically generated content |
| * may be combined (Eg engine.js for DWR). |
| * <p> |
| * The servlet uses parameter names of the query string as resource names |
| * relative to the context root. So these script tags: |
| * <pre> |
| * <script type="text/javascript" src="../js/behaviour.js"></script> |
| * <script type="text/javascript" src="../js/ajax.js&/chat/chat.js"></script> |
| * <script type="text/javascript" src="../chat/chat.js"></script> |
| * </pre> can be replaced with the single tag (with the ConcatServlet mapped to /concat): |
| * <pre> |
| * <script type="text/javascript" src="../concat?/js/behaviour.js&/js/ajax.js&/chat/chat.js"></script> |
| * </pre> |
| * The {@link ServletContext#getMimeType(String)} method is used to determine the |
| * mime type of each resource. If the types of all resources do not match, then a 415 |
| * UNSUPPORTED_MEDIA_TYPE error is returned. |
| * <p> |
| * If the init parameter "development" is set to "true" then the servlet will run in |
| * development mode and the content will be concatenated on every request. Otherwise |
| * the init time of the servlet is used as the lastModifiedTime of the combined content |
| * and If-Modified-Since requests are handled with 206 NOT Modified responses if |
| * appropriate. This means that when not in development mode, the servlet must be |
| * restarted before changed content will be served. |
| * |
| * |
| * |
| */ |
| public class ConcatServlet extends HttpServlet |
| { |
| boolean _development; |
| long _lastModified; |
| ServletContext _context; |
| |
| /* ------------------------------------------------------------ */ |
| public void init() throws ServletException |
| { |
| _lastModified=System.currentTimeMillis(); |
| _context=getServletContext(); |
| _development="true".equals(getInitParameter("development")); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /* |
| * @return The start time of the servlet unless in development mode, in which case -1 is returned. |
| */ |
| protected long getLastModified(HttpServletRequest req) |
| { |
| return _development?-1:_lastModified; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException |
| { |
| String q=req.getQueryString(); |
| if (q==null) |
| { |
| resp.sendError(HttpServletResponse.SC_NO_CONTENT); |
| return; |
| } |
| |
| String[] parts = q.split("\\&"); |
| String type=null; |
| for (int i=0;i<parts.length;i++) |
| { |
| String t = _context.getMimeType(parts[i]); |
| if (t!=null) |
| { |
| if (type==null) |
| type=t; |
| else if (!type.equals(t)) |
| { |
| resp.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE); |
| return; |
| } |
| } |
| } |
| |
| if (type!=null) |
| resp.setContentType(type); |
| |
| for (int i=0;i<parts.length;i++) |
| { |
| RequestDispatcher dispatcher=_context.getRequestDispatcher(parts[i]); |
| if (dispatcher!=null) |
| dispatcher.include(req,resp); |
| } |
| } |
| } |