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14 package com.acme;
15 import java.io.IOException;
16 import java.io.OutputStream;
17 import java.io.PrintWriter;
18
19 import javax.servlet.RequestDispatcher;
20 import javax.servlet.ServletContext;
21 import javax.servlet.ServletException;
22 import javax.servlet.ServletOutputStream;
23 import javax.servlet.http.HttpServlet;
24 import javax.servlet.http.HttpServletRequest;
25 import javax.servlet.http.HttpServletRequestWrapper;
26 import javax.servlet.http.HttpServletResponse;
27 import javax.servlet.http.HttpServletResponseWrapper;
28
29 import org.eclipse.jetty.util.log.Log;
30 import org.eclipse.jetty.util.log.Logger;
31
32
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34
35
36
37
38 public class DispatchServlet extends HttpServlet
39 {
40 private static final Logger LOG = Log.getLogger(DispatchServlet.class);
41
42
43 String pageType;
44
45
46 @Override
47 public void doPost(HttpServletRequest sreq, HttpServletResponse sres) throws ServletException, IOException
48 {
49 doGet(sreq, sres);
50 }
51
52
53 @Override
54 public void doGet(HttpServletRequest sreq, HttpServletResponse sres) throws ServletException, IOException
55 {
56 if (sreq.getParameter("wrap") != null)
57 {
58 sreq= new HttpServletRequestWrapper(sreq);
59 sres= new HttpServletResponseWrapper(sres);
60 }
61
62 if (sreq.getParameter("session") != null)
63 sreq.getSession(true);
64
65 String prefix=
66 sreq.getContextPath() != null ? sreq.getContextPath() + sreq.getServletPath() : sreq.getServletPath();
67
68 String info;
69
70 if (sreq.getAttribute("javax.servlet.include.servlet_path") != null)
71 info= (String)sreq.getAttribute("javax.servlet.include.path_info");
72 else
73 info= sreq.getPathInfo();
74
75 if (info == null)
76 info= "NULL";
77
78 if (info.indexOf(sreq.getServletPath()) > 0)
79 {
80 sres.sendError(403,"Nested " + sreq.getServletPath() + " forbidden.");
81 return;
82 }
83
84 if(info.indexOf(getServletName()) > 0)
85 {
86 sres.sendError(403,"Nested " + getServletName() + " forbidden.");
87 return;
88 }
89
90 if (info.startsWith("/includeW/"))
91 {
92 sres.setContentType("text/html");
93 info= info.substring(9);
94 if (info.indexOf('?') < 0)
95 info += "?Dispatch=include";
96 else
97 info += "&Dispatch=include";
98
99 PrintWriter pout= null;
100 pout= sres.getWriter();
101 pout.write("<H1>Include (writer): " + info + "</H1><HR>");
102
103 RequestDispatcher dispatch= getServletContext().getRequestDispatcher(info);
104 if (dispatch == null)
105 {
106 pout= sres.getWriter();
107 pout.write("<H1>Null dispatcher</H1>");
108 }
109 else
110 dispatch.include(sreq, sres);
111
112 pout.write("<HR><H1>-- Included (writer)</H1>");
113 }
114 else if (info.startsWith("/includeS/"))
115 {
116 sres.setContentType("text/html");
117 info= info.substring(9);
118 if (info.indexOf('?') < 0)
119 info += "?Dispatch=include";
120 else
121 info += "&Dispatch=include";
122
123 OutputStream out= null;
124 out= sres.getOutputStream();
125 out.write(("<H1>Include (outputstream): " + info + "</H1><HR>").getBytes());
126
127 RequestDispatcher dispatch= getServletContext().getRequestDispatcher(info);
128 if (dispatch == null)
129 {
130 out= sres.getOutputStream();
131 out.write("<H1>Null dispatcher</H1>".getBytes());
132 }
133 else
134 dispatch.include(sreq, sres);
135
136 out.write("<HR><H1>-- Included (outputstream)</H1>".getBytes());
137
138 }
139 else if (info.startsWith("/forward/"))
140 {
141 info= info.substring(8);
142 if (info.indexOf('?') < 0)
143 info += "?Dispatch=forward";
144 else
145 info += "&Dispatch=forward";
146
147 RequestDispatcher dispatch= getServletContext().getRequestDispatcher(info);
148 if (dispatch != null)
149 {
150 ServletOutputStream out =sres.getOutputStream();
151 out.print("Can't see this");
152 dispatch.forward(sreq, sres);
153 try
154 {
155
156 out.println("IOException");
157
158 throw new IllegalStateException();
159 }
160 catch(IOException e)
161 {
162 LOG.ignore(e);
163 }
164 }
165 else
166 {
167 sres.setContentType("text/html");
168 PrintWriter pout= sres.getWriter();
169 pout.write("<H1>No dispatcher for: " + info + "</H1><HR>");
170 pout.flush();
171 }
172 }
173 else if (info.startsWith("/forwardC/"))
174 {
175 info= info.substring(9);
176 if (info.indexOf('?') < 0)
177 info += "?Dispatch=forward";
178 else
179 info += "&Dispatch=forward";
180
181 String cpath= info.substring(0, info.indexOf('/', 1));
182 info= info.substring(cpath.length());
183
184 ServletContext context= getServletContext().getContext(cpath);
185 RequestDispatcher dispatch= context.getRequestDispatcher(info);
186
187 if (dispatch != null)
188 {
189 dispatch.forward(sreq, sres);
190 }
191 else
192 {
193 sres.setContentType("text/html");
194 PrintWriter pout= sres.getWriter();
195 pout.write("<H1>No dispatcher for: " + cpath + "/" + info + "</H1><HR>");
196 pout.flush();
197 }
198 }
199 else if (info.startsWith("/includeN/"))
200 {
201 sres.setContentType("text/html");
202 info= info.substring(10);
203 if (info.indexOf("/") >= 0)
204 info= info.substring(0, info.indexOf("/"));
205
206 PrintWriter pout;
207 if (info.startsWith("/null"))
208 info= info.substring(5);
209 else
210 {
211 pout= sres.getWriter();
212 pout.write("<H1>Include named: " + info + "</H1><HR>");
213 }
214
215 RequestDispatcher dispatch= getServletContext().getNamedDispatcher(info);
216 if (dispatch != null)
217 dispatch.include(sreq, sres);
218 else
219 {
220 pout= sres.getWriter();
221 pout.write("<H1>No servlet named: " + info + "</H1>");
222 }
223
224 pout= sres.getWriter();
225 pout.write("<HR><H1>Included ");
226 }
227 else if (info.startsWith("/forwardN/"))
228 {
229 info= info.substring(10);
230 if (info.indexOf("/") >= 0)
231 info= info.substring(0, info.indexOf("/"));
232 RequestDispatcher dispatch= getServletContext().getNamedDispatcher(info);
233 if (dispatch != null)
234 dispatch.forward(sreq, sres);
235 else
236 {
237 sres.setContentType("text/html");
238 PrintWriter pout= sres.getWriter();
239 pout.write("<H1>No servlet named: " + info + "</H1>");
240 pout.flush();
241 }
242 }
243 else
244 {
245 sres.setContentType("text/html");
246 PrintWriter pout= sres.getWriter();
247 pout.write(
248 "<H1>Dispatch URL must be of the form: </H1>"
249 + "<PRE>"
250 + prefix
251 + "/includeW/path\n"
252 + prefix
253 + "/includeS/path\n"
254 + prefix
255 + "/forward/path\n"
256 + prefix
257 + "/includeN/name\n"
258 + prefix
259 + "/forwardC/_context/path\n</PRE>");
260 }
261
262 }
263
264
265 @Override
266 public String getServletInfo()
267 {
268 return "Include Servlet";
269 }
270
271
272 @Override
273 public synchronized void destroy()
274 {
275 }
276
277 }