ShowMessage.java Servlet that demonstrates the use of initialization parameters.

ShowMessage.java  Servlet that demonstrates the use of initialization parameters. Remember that, to use this servlet, you have to do three things:

    * Put the modified web.xml file in the WEB-INF directory.
    * Restart the server.
    * Use the registered servlet name (i.e., the URL http://host/servlet/ShowMsg), not the raw servlet name (i.e., the URL http://host/servlet/cwp.ShowMessage). 


package cwp;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Example using servlet initialization. Here, the message
 *  to print and the number of times the message should be
 *  repeated is taken from the init parameters.
 *  


 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ShowMessage extends HttpServlet {
  private String message;
  private String defaultMessage = "No message.";
  private int repeats = 1;

  public void init() throws ServletException {
    ServletConfig config = getServletConfig();
    message = config.getInitParameter("message");
    if (message == null) {
      message = defaultMessage;
    }
    try {
      String repeatString = config.getInitParameter("repeats");
      repeats = Integer.parseInt(repeatString);
    } catch(NumberFormatException nfe) {
      // NumberFormatException handles case where repeatString
      // is null *and* case where it is in an illegal format.
    }
  }

  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "The ShowMessage Servlet";
    out.println(ServletUtilities.headWithTitle(title) +
                "\n" +
                "
" + title + "
");
    for(int i=0; i" + message + "
");
    }
    out.println("");
  }
}


web.xml



?

ShowMsg
cwp.ShowMessage
?

message
Shibboleth

?

repeats
5