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 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package weldservlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * This Servlet class demonstrates use of request
 * scoped and session scoped CDI beans.
 */
@WebServlet(name="LoginServlet", urlPatterns={"/LoginServlet"})
public class LoginServlet extends HttpServlet {

    // Inject the Credentials request-scoped bean.
    @Inject Credentials credentials;

    // Inject the Login session-scoped bean.
    @Inject LoginHandler login;

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        //populate the credentials request scoped beans with
        //the user provided username and password
        credentials.setUsername(request.getParameter("username"));
        credentials.setPassword(request.getParameter("password"));

        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

        try {
            //attempt to login using the provided credentials
            login.login();

            //Print appropriate logged in status message
            if (login.isLoggedIn()) {
                out.println("Successfully Logged In as: " + credentials.getUsername());
            } else {
                out.println("Login Failed: Check username and/or password.");
            }
        } finally { 
            out.close();
        }
    } 

    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
}
