action="post" 、 servletconfig 、 servletcontext 、getPrintWiter() 、context-param、 init-param(第一个完整的servlet)

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>注册</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="this is my page">

    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

  </head>

  <body>

   <form method="post" action="/ServletOne/registered.do">

        <table width="400px" height="300px">

          <tr>

            <td align="right">用户名：</td>

            <td><input type="text" name="username"/></td>

          <tr>

          <tr>

            <td align="right">密码：</td>

            <td><input type="password" name="passwd"/></td>

          <tr>

          <tr>

                <td colspan="2" align="center"><input type="submit" value="注册"/></td>

          </tr>

        </table>

   </form>

  </body>

</html>

package registered;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletConfig;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class RegisteredServlet extends HttpServlet {

    public void init() throws ServletException {

        ServletConfig scf=this.getServletConfig();

        ServletContext sct=this.getServletContext();

        //获取init配置参数指定参数     config   jack

        System.out.println("config   "+scf.getInitParameter("name"));

        //获取整个init配置参数数组    Enumeration  name   Enumeration  age

        Enumeration e=scf.getInitParameterNames();

        while(e.hasMoreElements()){

            System.out.println("Enumeration  "+e.nextElement().toString());

        }

        //获取context-param参数值      context  ServletContextValue

        System.out.println("context  "+sct.getInitParameter("ServletContextName"));

    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        System.out.println("DoGet()");

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        System.out.println("DoPost()");

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

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

        PrintWriter out=response.getWriter();

        out.write("username="+name);

        out.write("<br/>");

        out.write("passwd="+passwd);

    }

}

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    id="WebApp_ID" version="2.5">

    <display-name>ServletOne</display-name>

    <context-param>

        <param-name>ServletContextName</param-name>

        <param-value>ServletContextValue</param-value>

    </context-param>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

        <welcome-file>index.htm</welcome-file>

        <welcome-file>index.jsp</welcome-file>

        <welcome-file>default.html</welcome-file>

        <welcome-file>default.htm</welcome-file>

        <welcome-file>default.jsp</welcome-file>

    </welcome-file-list>

    <!--配置时一律小写 -->

    <servlet>

        <servlet-name>Servlet01</servlet-name>

        <servlet-class>servlet_1121.Servlet01</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>Servlet01</servlet-name>

        <url-pattern>/s1</url-pattern>

    </servlet-mapping>

    <!-- 注册 -->

    <servlet>

        <servlet-name>RegisteredServlet</servlet-name>

        <servlet-class>registered.RegisteredServlet</servlet-class>

        <init-param>

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

           <param-value>jack</param-value>

        </init-param>

        <init-param>

           <param-name>age</param-name>

           <param-value>20</param-value>

        </init-param>

    </servlet>

    <servlet-mapping>

        <servlet-name>RegisteredServlet</servlet-name>

        <url-pattern>/registered.do</url-pattern>

    </servlet-mapping>

</web-app>

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action="post" 、 servletconfig 、 servletcontext 、getPrintWiter() 、context-param、 init-param(第一个完整的servlet)

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