servlet - loadParameter

package thieu.mao;

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

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

/**
 * Servlet implementation class HelloWorld
 */
@WebServlet(description = "This is a demo", urlPatterns = { "/mao" })
public class HelloWorld extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloWorld() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        loadParameter(request, response, "by Get");
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        loadParameter(request, response, "by Post");
    }

    private void loadParameter(HttpServletRequest request,
            HttpServletResponse response, String method)
            throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        PrintWriter writer = response.getWriter();
        writer.println("Hello world " + method + "<br>");
        writer.println("Username: " + username + "<br>");
        writer.println("Password: " + password + "<br>");
    }

}