| // |
| // ======================================================================== |
| // Copyright (c) 1995-2015 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 com.acme; |
| |
| import static javax.servlet.RequestDispatcher.FORWARD_PATH_INFO; |
| import static javax.servlet.RequestDispatcher.FORWARD_QUERY_STRING; |
| import static javax.servlet.RequestDispatcher.FORWARD_SERVLET_PATH; |
| import static javax.servlet.RequestDispatcher.INCLUDE_PATH_INFO; |
| import static javax.servlet.RequestDispatcher.INCLUDE_QUERY_STRING; |
| import static javax.servlet.RequestDispatcher.INCLUDE_REQUEST_URI; |
| import static javax.servlet.RequestDispatcher.INCLUDE_SERVLET_PATH; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| |
| public class DispatchServlet extends HttpServlet |
| { |
| |
| @Override |
| protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException |
| { |
| doGet(req, resp); |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException |
| { |
| Integer depth = (Integer)request.getAttribute("depth"); |
| if (depth==null) |
| depth=1; |
| else |
| depth=depth+1; |
| request.setAttribute("depth", depth); |
| |
| String path=request.getServletPath(); |
| String info=request.getPathInfo(); |
| String query=request.getQueryString(); |
| |
| boolean include=request.getAttribute(INCLUDE_REQUEST_URI)!=null; |
| |
| String tpath = include?(String)request.getAttribute(INCLUDE_SERVLET_PATH):path; |
| String tinfo = include?(String)request.getAttribute(INCLUDE_PATH_INFO):info; |
| |
| if ("/forward".equals(tpath)) |
| { |
| getServletContext().getRequestDispatcher(tinfo+"?depth="+depth+"&p"+depth+"="+"ABCDEFGHI".charAt(depth)).forward(request, response); |
| } |
| else if ("/include".equals(tpath)) |
| { |
| response.setContentType("text/html"); |
| PrintWriter out = response.getWriter(); |
| out.println("<h1>Dispatch Depth="+depth+"</h1><pre>"); |
| out.printf(" %30s%30s%30s%n","REQUEST","FORWARD","INCLUDE"); |
| out.printf("servletPath:%30s%30s%30s%n",path,request.getAttribute(FORWARD_SERVLET_PATH),request.getAttribute(INCLUDE_SERVLET_PATH)); |
| out.printf(" pathInfo:%30s%30s%30s%n",info,request.getAttribute(FORWARD_PATH_INFO),request.getAttribute(INCLUDE_PATH_INFO)); |
| out.printf(" query:%30s%30s%30s%n",query,request.getAttribute(FORWARD_QUERY_STRING),request.getAttribute(INCLUDE_QUERY_STRING)); |
| out.println(); |
| printParameters(out, request.getParameterMap()); |
| out.println("</pre>"); |
| out.println("<hr/>"); |
| getServletContext().getRequestDispatcher(tinfo+"?depth="+depth+"&p"+depth+"="+"BCDEFGHI".charAt(depth)).include(request, response); |
| out.println("<hr/>"); |
| out.println("<h1>Dispatch Depth="+depth+"</h1><pre>"); |
| out.printf(" %30s%30s%30s%n","REQUEST","FORWARD","INCLUDE"); |
| out.printf("servletPath:%30s%30s%30s%n",path,request.getAttribute(FORWARD_SERVLET_PATH),request.getAttribute(INCLUDE_SERVLET_PATH)); |
| out.printf(" pathInfo:%30s%30s%30s%n",info,request.getAttribute(FORWARD_PATH_INFO),request.getAttribute(INCLUDE_PATH_INFO)); |
| out.printf(" query:%30s%30s%30s%n",query,request.getAttribute(FORWARD_QUERY_STRING),request.getAttribute(INCLUDE_QUERY_STRING)); |
| out.println(); |
| printParameters(out, request.getParameterMap()); |
| out.println("</pre>"); |
| } |
| else |
| { |
| response.setContentType("text/html"); |
| PrintWriter out = response.getWriter(); |
| out.println("<h1>Dispatch Depth="+depth+"</h1><pre>"); |
| out.printf(" %30s%30s%30s%n","REQUEST","FORWARD","INCLUDE"); |
| out.printf("servletPath:%30s%30s%30s%n",path,request.getAttribute(FORWARD_SERVLET_PATH),request.getAttribute(INCLUDE_SERVLET_PATH)); |
| out.printf(" pathInfo:%30s%30s%30s%n",info,request.getAttribute(FORWARD_PATH_INFO),request.getAttribute(INCLUDE_PATH_INFO)); |
| out.printf(" query:%30s%30s%30s%n",query,request.getAttribute(FORWARD_QUERY_STRING),request.getAttribute(INCLUDE_QUERY_STRING)); |
| out.println(); |
| printParameters(out, request.getParameterMap()); |
| out.println("</pre>"); |
| } |
| } |
| |
| private static void printParameters(PrintWriter out, Map<String,String[]> params) |
| { |
| List<String> names = new ArrayList<>(params.keySet()); |
| Collections.sort(names); |
| |
| for (String name: names) |
| out.printf("%10s : %s%n", name,Arrays.asList(params.get(name))); |
| } |
| |
| } |