Web（一）

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>