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<repeats ; i++) {
out.println("" + message + "
");
}
out.println("");
}
}
web.xml
?
ShowMsg
cwp.ShowMessage
?
message
Shibboleth
?
repeats
5
Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10245
Categories:Programming Code Examples, Java/J2EE/J2ME, Servlet
Tags:Java/J2EE/J2MEServlet
Post Data:2017-01-02 16:04:28
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