Servlet init parameters

these parameters are used to store some dynamic information in web applications.
init parameters can be accessed through the servlet config object where every servlet gets a reference to that.init parameters can only be accessed after calling the init method for that servlet.because the servletconfig is only available after a servlet initialization is done.

• how to access init parameters

the ServletConfig interface have a method for getting init parameters
this is how we do that
getServletConfig.getInitParameter("Admin-email") ;

Dealing with the response

this is a sample class written by me to show how to deal with the responses.

package connection;

import java.io.*;
import java.net.*;

import javax.servlet.*;
import javax.servlet.http.*;


public class NewServlet extends HttpServlet {


protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//setting the content type
response.setContentType("text/html");
//response.setContentType("application/jar");
//we give the response page's content via this method
//whether it is a html one or appication download or some thing else

//to write data in to a character stream
PrintWriter out = response.getWriter();
//to add a new header
response.addHeader("name","value");
//to replace an existing header
response.setHeader("name", "new value");
//to redirect to a new page some where else
response.sendRedirect("www.cmb.ac.lk");
//to direct another portion of the web application
RequestDispatcher rd=request.getRequestDispatcher("test.jsp");
out.close();
}


protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}


protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

}