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How to use @WebInitParam annotation for setting initialization parameters in Servlet ?.

A simple HelloWorldServlet demonstrating usage of @WebInitParam annotation for setting initialization parameters.

package com.hubberspot.javaee;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

// @WebServlet annotation has a initParams field which takes
// in initialization parameters for a servlet.
// @WebInitParam annotation takes in a name and value for the
// initialization parameters for the current Servlet.

@WebServlet(name = "HelloWorldServlet" , urlPatterns = { "/HelloWorldServlet" }
    , initParams = { @WebInitParam(name = "user" , value = "Jonty") })
public class HelloWorldServlet extends HttpServlet {

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

  response.setContentType("text/html");

  PrintWriter out = response.getWriter();

  try {
   out.println("<html>");
   out.println("<body>");
   out.println("<h2>Hello " 
      + getServletConfig().getInitParameter("user") 
      + "</h2>");
   out.println("</body>");
   out.println("</html>");
  } finally {
   out.close();
  }

 }

}




Output of the program : 


 
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