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

/**
 * This is a simple Hello World servlet example to show the main
 * servlet methods.
 *
 * @author Hans Bergsten, Gefion software <hans@gefionsoftware.com>
 * @version 1.0
 */
public class HelloWorld extends HttpServlet {
    private String greeting;

    /**
     * This method is called once by the container when the servlet is
     * initialized, before any requests are delivered to the servlet.
     *
     * In this example, the method reads a servlet init parameter
     * value and saves it in an instance variable. If the parameter
     * is not found, a default value is saved instead.
     */
    public void init() {
        ServletConfig config = getServletConfig();
        greeting = config.getInitParameter("greeting");
        if (greeting == null) {
          greeting = "Hello World!";
        }
    }

    /**
     * This method is called by the container for each GET request.
     *
     * In this example, the method writes a line of text to the
     * response body.
     */
    public void doGet(HttpServletRequest request, 
        HttpServletResponse response) 
        throws ServletException, IOException {

        PrintWriter out = response.getWriter();
        out.println(greeting);
    }

    /**
     * This method is called once by the container just before the servlet
     * is taken out of service.
     *
     * In this example, the method resets the servlet instance variable.
     */
    public void destroy() {
      greeting = null;
    }
}