java code for Init Param Servlet

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

public class InitParamServlet extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
{

res.setContentType("text/plain");
PrintWriter out = res.getWriter();

String url = getInitParameter("URL");

ServletConfig config = getServletConfig();
ServletContext context = getServletContext();
String uid = config.getInitParameter("UID");
String pwd = config.getInitParameter("PWD");
String port = context.getInitParameter("some-port");

out.println("Values retrieved for the init parameters are: ");
out.println("URL: " + url);
out.println("UID: " + uid);
out.println("PWD: " + pwd);
out.println("some-port: " + port);
}
}