web.xml deployment descriptor

Pls guide about how to write the web.xml file to deploy our web applications that uses JSP, by using tomcat...

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February 22, 2008 at 8:48 PM

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

public class HelloWorld extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<body>");
out.println("<h1>Hello World!</h1>");
out.println("</body>");
out.println("</html>");
}
}

<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/HelloWorld</url-pattern?>
</servlet-mapping>

February 22, 2008 at 9:10 PM

Hi,

Here I am assuming that you have already downloaded and intalled the tomcat on your machine and you are able to access http://localhost:8080. On typing http://localhost:8080 your browser shows the tomcat?s default page.

Now I am going to explain you the process to create web application, write hello world jsp file and then check on the tomcat server.

Step 1:
Stop the tomcat

Step 2:

Go to tomcat?s webapps directory and create the following directory:

[tomcat-root]/webapps
|_ test
|_ WEB-INF
|_ classes

here test is the name of web application.

Step 3:

Now create hello world jsp page in the test directory. Here is the code of hello.jsp

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>Hello World</TITLE>
<BODY>
<%="Hello World!"%>
</BODY>
</HTML>

Step 4:

Now Start the tomcat server.

Step 5:

Now you can test your application. To test the example type http://localhost:8080/test/hello.jsp

You browser should display the hello world message.

Hope you will help in getting started with JSP in tomcat.

Thanks

February 22, 2008 at 9:23 PM

Hi,

Here is the code of web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">;


</web-app>

Save the web.xml file into WEB-INF directory.

You can declare your servlet into web.xml file.

<!-- Hello World Servlet -->
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>HelloWorld</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/Hello</url-pattern>
</servlet-mapping>

To access the servlet you have to type http://localhost:8080/test/Hello into browser.

Thanks