Web.xml file location for Servlet initialization.

Niketu Parekh <[email protected]> Sun, 24 Aug 2003 09:53:11 -0600
Newsgroups	gmane.comp.java.sun.servlet
Message-ID	<LISTSERV%[email protected]>
Hi,

I am new to JavaServlets. Learning it through the examples. I am trying to
understand how servlet initialization works?
I m using the HttpServlet.init(ServletConfig conf) method to read the
web.xml file and set few parameters using ServletConfig.getInitParameter
("") method.

As per the documentation, the web.xml file should be in \WEB-INF\
directory. But my source code is not working. I dont get the correct
parameter values using ServletConfig.getInitParameter(). Below is the
source code. I would really appreciate if someone can help me solve this
problem.

install_dir = C:\Apache\Tomcar4.1\
examples_dir = install_dir\webapps\ROOT\WEB-
INF\classes\HelloWorldExample.java
web.xml file location - install_dir\ROOT\WEB-INF\web.xml

Thanks
- Niketu

SourceCode HelloWorldExample.java -
=================================
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorldExample extends HttpServlet {
 private String message;
 private String defaultmessage = "No Message";
 private int repeats = 1;

 public void init(ServletConfig config) throws ServletException {
  super.init(config);
  message = config.getInitParameter("message");
  if(message == null)
   message = defaultmessage;

  try {
   String repeatstring = config.getInitParameter
("repeats");
   repeats = Integer.parseInt(repeatstring);
  } catch (NumberFormatException ne) {
  }
 }

 public void doGet(HttpServletRequest req, HttpServletResponse
resp) throws ServletException, IOException {
  resp.setContentType("text/html");
  PrintWriter out = resp.getWriter();
  String title = "The ShowMessage Servlet";
  out.println(ServletUtilities.headWithTitle(title) +
    "<BODY BGCOLOR=\"#FDF5E6\">\n" +
    "<H1 ALIGN=CENTER>" + title + "</H1>");

  for(int i=0; i < repeats; i++)
   out.println(message + "<BR>");

  out.println("</BODY></HTML>");
 }
}

SourceCode ServletUtilities.java -
================================
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ServletUtilities {

 public static final String docType = "<!DOCTYPE HTML PUBLIC \"-
//W3C//DTD HTML 4.0 " + "Transitional//EN\">";

 public static String headWithTitle (String title) {
 return (docType + "\n" +
  "<HTML>\n" +
  "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n");
 }
}

Web.xml file -
============
<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web
Application2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">

<web-app>
 <servlet>
  <servlet-name>
   ShowMsg
  </servlet-name>

  <servlet-class>
   coreservlets.ShowMessage
  </servlet-class>

  <init-param>
   <param-name>
    message
   </param-name>
   <param-value>
    Shibboleth
   </param-value>
  </init-param>

  <init-param>
   <param-name>
    repeats
   </param-name>
   <param-value>
    5
   </param-value>
  </init-param>
 </servlet>
</web-app>

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