为什么不执行doget

package com.michael.servlet;import java.io.IOException;
import java.io.PrintWriter;import java.util.Enumeration;import javax.servlet.*;
import javax.servlet.http.*;public class ServletBasic extends HttpServlet {
  //  private static final String CONTENT_TYPE = "text/html; charset=GBK";  /*  public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }
*/
    public ServletBasic() {
        super();
        System.out.println("----ServletBasic-----");
    }    public void destroy() {
        super.destroy();
        System.out.println("----destroy-----");
    }    public void doGet(HttpServletRequest request, 
                      HttpServletResponse response) throws ServletException, 
                                                           IOException {
       // System.out.println("----doget-----");                                                   
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("username=" + username);
        if (username != null && username.equals("redking")) {
            request.getRequestDispatcher("/successful.html").forward(request, 
                                                                     response);
        } else {
            request.getRequestDispatcher("/failure.html").forward(request, 
                                                                  response);
        }
        /*  System.out.println("----doget-----");
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head><title>A Servlet</title></head>");
        out.println("<body>");
        out.println("     this is");
        out.println(this.getClass());
        out.println(",using the GET method");
        out.println("<p>The servlet has received a GET. This is the reply.</p>");
        out.println("<p>welcom to amaker!.</p>");
        out.println("</body></html>");
        out.close();*/
    }    public void doPost(HttpServletRequest request, 
                       HttpServletResponse response) throws ServletException, 
                                                            IOException {
        System.out.println("----dopost-----");
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head><title>A Servlet</title></head>");
        out.println("<body>");
        out.println("     this is");
        out.println(this.getClass());
        out.println(",using the POST method");
        out.println("<p>The servlet has received a POST. This is the reply.</p>");
        out.println("</body></html>");
        out.close();
    }    public void init() throws ServletException {
        //第一种方法
        /*
        String driver = this.getServletContext().getInitParameter("driver");
        String url = this.getServletContext().getInitParameter("url");
        System.out.println(driver);
        System.out.println(url);
        System.out.println("----init-----");
        */
        //第二种方法
        /*  Enumeration enu = this.getServletContext().getInitParameterNames();
        while(enu.hasMoreElements()){
            String name = (String)enu.nextElement();
            String value = this.getServletContext().getInitParameter(name);
            System.out.println(name+":"+value);
        }*/
        String username = this.getInitParameter("username");
        String password = this.getInitParameter("password");
        System.out.println(username);
        System.out.println(password);
        System.out.println("-----init-------");
    }
/*
    @override
    protected void service(HttpServletRequest arg0, 
                           HttpServletResponse arg1) throws ServletException, 
                                                            IOException {
        System.out.println("----service-----");
    }*/
}