jsp另外五大内置对象之config
//配置web.xml
<?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>HeadFirstJspServletChap02</display-name>
<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>
<servlet>
<servlet-name>init</servlet-name>
<jsp-file>/sysInit.jsp</jsp-file>
<init-param>
<param-name>jdbcName</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</init-param>
<init-param>
<param-name>dbUrl</param-name>
<param-value>jdbc:mysql://localhost:3306/db_xx</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>init</servlet-name>
<url-pattern>/init</url-pattern>
</servlet-mapping>
</web-app>
跳转页面sysInit
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.util.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String jdbcName=config.getInitParameter("jdbcName");
String dbUrl=config.getInitParameter("dbUrl");
%>
<h1>驱动名称：<%=jdbcName %></h1>
<h1>连接地址：<%=dbUrl %></h1>
</body>
</html>
