<servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>InitParamServlet</servlet-name>

    <servlet-class>servlet.InitParamServlet</servlet-class>

    <init-param>

        <param-name>helloween</param-name>

        <param-value>password</param-value>

    </init-param>

        <init-param>

        <param-name>admin</param-name>

        <param-value>admin</param-value>

    </init-param>

        <init-param>

        <param-name>babyface</param-name>

        <param-value>babyface</param-value>

    </init-param>

  </servlet>

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class InitParamServlet extends HttpServlet {

    /**

     * Constructor of the object.

     */

    public InitParamServlet() {

        super();

    }

    /**

     * Destruction of the servlet. <br>

     */

    public void destroy() {

        super.destroy(); // Just puts "destroy" string in log

        // Put your code here

    }

    /**

     * The doGet method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to get.

     *

     * @param request the request send by the client to the server

     * @param response the response send by the server to the client

     * @throws ServletException if an error occurred

     * @throws IOException if an error occurred

     */

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setCharacterEncoding("UTF-8");

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

        out.println("<HTML>");

        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");

        out.println("  <BODY>");

        out.println("<form action='"+request.getRequestURI()+"' method='post'>");

        out.println("账号:<input type='text' name='username'<br><br/>");

        out.println("密码:<input type='password' name='password'<br><br/>");

        out.println("<input type='submit' value='  登陆    '>");

        out.println("</form>");

        out.println("  </BODY>");

        out.println("</HTML>");

        out.flush();

        out.close();

    }

    /**

     * The doPost method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to post.

     *

     * @param request the request send by the client to the server

     * @param response the response send by the server to the client

     * @throws ServletException if an error occurred

     * @throws IOException if an error occurred

     */

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        response.setCharacterEncoding("UTF-8");

        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        String username=request.getParameter("username");

        String password=request.getParameter("password");

        Enumeration params=this.getInitParameterNames();

        for(;params.hasMoreElements();){

            String usernameParam=params.nextElement().toString();

            String passnameParam=getInitParameter(usernameParam);

            if(usernameParam.equalsIgnoreCase(username)&&passnameParam.equals(password)){

                request.getRequestDispatcher("/WEB-INF/notice.html").forward(request,response);

                return;

            }

        }

        doGet(request,response);//不匹配的话重新加载

    }

    /**

     * Initialization of the servlet. <br>

     *

     * @throws ServletException if an error occurs

     */

    public void init() throws ServletException {

        // Put your code here

    }

}