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1
16 package dlog4j;
17
18 import java.io.File  ;
19 import java.io.IOException ;
20 import java.io.InputStream ;
21 import java.net.URL ;
22 import java.text.MessageFormat ;
23 import java.text.ParseException ;
24 import java.util.Vector ;
25 import java.util.List ;
26
27 import javax.servlet.ServletException ;
28 import javax.servlet.http.HttpServlet ;
29 import javax.servlet.http.HttpServletRequest ;
30 import javax.servlet.http.HttpServletResponse ;
31
32 import org.apache.commons.digester.Digester;
33 import org.apache.commons.lang.StringUtils;
34 import org.xml.sax.SAXException ;
35
36
41 public class EmbedPageServlet extends HttpServlet {
42
43 public final static String URL_SEPARATOR = "/";
44 protected MessageFormat mappingFormat;
45 protected String paramName = "main";
46 protected String baseDir = "/WEB-INF/jsp/";
47
48 private String prefix ;
49
50
53 public void init() throws ServletException {
54
55 initServlet();
56 if(mappingFormat==null){
57 mappingFormat = new MessageFormat ("{0}.jspe");
59 }
60 String bd = getInitParameter("baseDir");
61 if(bd!=null && bd.trim().length()>0){
62 baseDir = bd;
63 if(!baseDir.startsWith(URL_SEPARATOR))
64 baseDir = URL_SEPARATOR + baseDir;
65 if(!baseDir.endsWith(URL_SEPARATOR))
66 baseDir += URL_SEPARATOR;
67 }
68
69 String cp = getInitParameter("container");
70 if(cp!=null&&cp.trim().length()>0){
71 if(!cp.startsWith(URL_SEPARATOR))
72 cp = baseDir + URL_SEPARATOR + cp;
73 }
74 else
75 log("FATAL: cannot read parameter container's value, must assign a valid jsp");
76
77 String pn = getInitParameter("paramName");
78 if(pn!=null&&pn.trim().length()>0)
79 paramName = pn;
80
81 StringBuffer newPage = new StringBuffer (64);
82 newPage.append(cp);
83 newPage.append('?');
84 newPage.append(paramName);
85 newPage.append('=');
86
87 prefix = newPage.toString();
88 }
89
90
93 protected void doGet(HttpServletRequest req, HttpServletResponse res)
94 throws ServletException , IOException
95 {
96 res.setLocale(req.getLocale());
97 String jspPage = null;
98 try{
99 jspPage = getForwardPage(req.getServletPath());
100 }catch(ParseException e){
101 String sPath = (String )req.getAttribute(Globals.ACTION_PATH_KEY);
102 if(sPath!=null){
103 int param_idx = sPath.indexOf('?');
104 if(param_idx!=-1)
105 sPath = sPath.substring(0, param_idx);
106 try{
107 jspPage = getForwardPage(sPath);
108 }catch(ParseException ee){
109 log("parse forward path from action failed.",ee);
110 }
111 }
112 }
113 if(jspPage.startsWith(URL_SEPARATOR))
115 jspPage = jspPage.substring(URL_SEPARATOR.length());
116 StringBuffer jspPath = new StringBuffer (baseDir);
117 jspPath.append(jspPage);
118 if(!isJspExists(jspPath.toString())){
119 res.sendError(HttpServletResponse.SC_NOT_FOUND);
120 return;
121 }
122 jspPath = null;
123 StringBuffer newPage = new StringBuffer (prefix);
125 newPage.append(jspPage);
126
127 String url = newPage.toString();
128 getServletContext().getRequestDispatcher(url).include(req,res);
129 newPage = null;
130 }
131
132 protected String getForwardPage(String path) throws ParseException {
133 Object [] ps = mappingFormat.parse(path);
134 return ps[0] + ".jsp";
135 }
136
137
140 protected void doPost(HttpServletRequest req, HttpServletResponse res)
141 throws ServletException , IOException {
142 this.doGet(req, res);
143 }
144
145
150 protected boolean isJspExists(String jsp){
151 String webpath = getServletContext().getRealPath(jsp);
152 if(!pages.contains(webpath)){
153 boolean exists = new File (webpath).exists();
154 if(exists)
155 pages.add(webpath);
156 return exists;
157 }
158 return true;
159 }
160
161 private List pages = new Vector ();
162
163 public void destroy() {
164 if(pages!=null){
165 pages.clear();
166 pages = null;
167 }
168 }
169
176 protected void initServlet() throws ServletException {
177 Digester digester = new Digester();
179 digester.push(this);
180 digester.setNamespaceAware(true);
182 digester.setValidating(false);
183
184 for (int i = 0; i < registrations.length; i += 2) {
186 URL url = this.getClass().getResource(registrations[i+1]);
187 if (url != null) {
188 digester.register(registrations[i], url.toString());
189 }
190 }
191
192 digester.addCallMethod("web-app/servlet-mapping",
194 "addServletMapping", 2);
195 digester.addCallParam("web-app/servlet-mapping/servlet-name", 0);
196 digester.addCallParam("web-app/servlet-mapping/url-pattern", 1);
197
198 InputStream input = getServletContext().getResourceAsStream("/WEB-INF/web.xml");
199
200 if(input==null)
201 throw new ServletException ("Cannot read web.xml");
202
203 try {
204 digester.parse(input);
205 } catch (IOException e) {
206 throw new ServletException (e);
207 } catch (SAXException e) {
208 throw new ServletException (e);
209 } finally {
210 try {
211 input.close();
212 } catch (IOException e) {
213 throw new ServletException (e);
214 }
215 }
216 }
217
224 public void addServletMapping(String servletName, String urlPattern) {
225 if (servletName == null)
226 return;
227 if (servletName.equals(getServletConfig().getServletName())) {
228 String servletMapping = StringUtils.replace(urlPattern, "*", "{0}");
229 mappingFormat = new MessageFormat (servletMapping);
230 }
231 }
232
233
238 protected String registrations[] = {
239 "-//Apache Software Foundation//DTD Struts Configuration 1.0//EN",
240 "/org/apache/struts/resources/struts-config_1_0.dtd",
241 "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN",
242 "/org/apache/struts/resources/struts-config_1_1.dtd",
243 "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN",
244 "/org/apache/struts/resources/struts-config_1_2.dtd",
245 "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN",
246 "/org/apache/struts/resources/web-app_2_2.dtd",
247 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN",
248 "/org/apache/struts/resources/web-app_2_3.dtd"
249 };
250
251 }
252
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