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>
