Getting Servlet Version Info 

A program (servlet or JSP) may want to know the version what version of  the Servlet API is current.

Here is a simple JSP that shows this information.

 The the version of Servlets currently running is:
 <%
 int majorVersion = application.getMajorVersion();
 int minorVersion = application.getMinorVersion();
 out.println(majorVersion + "." + minorVersion);
 %>
  

Here is a Servlet that does the same thing:

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

public class ShowJrun extends HttpServlet {
 PrintWriter out = null;
 public void service (ServletRequest req , ServletResponse res) throws IOException {
 try {
 res.setContentType("text/html");
 out = res.getWriter();

 ServletContext sc = getServletContext();

 int majorVersion = sc.getMajorVersion();
 int minorVersion = sc.getMinorVersion();
 out.println("The Servlet version is " + majorVersion + "." + minorVersion + "<BR>");
 
 }catch (Exception e) {
 out.println("Exception " + e);
 }
 }
}