Web（一）详解编程语言

Tomcat 服务器 B/S 浏览器/服务器 C/S 客户端/服务器

URI ：大广 /项目名
URL：小 http：//localhost：8080/项目名/页面

JSP的生命周期

<%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + “://”
            + request.getServerName() + “:” + request.getServerPort()
            + path + “/”;
%>

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”>
<html>
<head>
<base href=”<%=basePath%>”>

<title>My JSP ‘index.jsp’ starting page</title>

<meta http-equiv=”pragma” content=”no-cache”>

<meta http-equiv=”cache-control” content=”no-cache”>

<meta http-equiv=”expires” content=”0″>

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

<meta http-equiv=”description” content=”This is my page”>

</head>

<body>

    <%!//全局变量

    int initNum = 0;

    int serviceNum = 0;

    int destroyNum = 0;

    %>

    <%!//书写两个方法

    public void jspInit() {

        initNum++;

        System.out.println(“jspInit()初始化执行了” + initNum + “次”);

    }

    public void jspDestroy() {

        destroyNum++;

        System.out.println(“jspdestroy()销毁执行了” + destroyNum + “次”);

    }

    %>

    <%

        //只要是没有！所有的内容都会在service中

        //service()

        serviceNum++;

        System.out.println(“jspDestroy()销毁执行了” + destroyNum + “次”);

        String sayInit = “初始化次数” + initNum;

        String sayService = “执行次数” + serviceNum;

        String sayDestroy = “销毁次数” + destroyNum;

    %>

    <%=sayInit%><br/>

    <%=sayService%><br/>

    <%=sayDestroy%><br/>

</body>

</html>