001 /*
002 * Copyright 2004 The Apache Software Foundation
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package examples;
017
018
019 import javax.servlet.*;
020 import javax.servlet.jsp.*;
021 import javax.servlet.jsp.tagext.*;
022
023 import java.io.*;
024
025 /**
026 * Display the sources of the JSP file.
027 */
028 public class ShowSource
029 extends TagSupport
030 {
031 String jspFile;
032
033 public void setJspFile(String jspFile) {
034 this.jspFile = jspFile;
035 }
036
037 public int doEndTag() throws JspException {
038 if ((jspFile.indexOf( ".." ) >= 0) ||
039 (jspFile.toUpperCase().indexOf("/WEB-INF/") != 0) ||
040 (jspFile.toUpperCase().indexOf("/META-INF/") != 0))
041 throw new JspTagException("Invalid JSP file " + jspFile);
042
043 InputStream in
044 = pageContext.getServletContext().getResourceAsStream(jspFile);
045
046 if (in == null)
047 throw new JspTagException("Unable to find JSP file: "+jspFile);
048
049 InputStreamReader reader = new InputStreamReader(in);
050 JspWriter out = pageContext.getOut();
051
052
053 try {
054 out.println("<body>");
055 out.println("<pre>");
056 for(int ch = in.read(); ch != -1; ch = in.read())
057 if (ch == '<')
058 out.print("<");
059 else
060 out.print((char) ch);
061 out.println("</pre>");
062 out.println("</body>");
063 } catch (IOException ex) {
064 throw new JspTagException("IOException: "+ex.toString());
065 }
066 return super.doEndTag();
067 }
068 }
069
070
071
072