软件开发基础(.Java)实验指导书V2(9)

【步骤2】修改web.xml文件，在其中添加下面Servlet定义和初始化参数定义

configDemoServlet

com.demo.ConfigDemoServlet

email

hacker@163.com

telephone 8899123

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configDemoServlet /configDemo.do

【步骤3】在浏览器的地址栏中输入下面URL访问该Servlet： http://localhost:8080/bookstore/configDemo.do 程序运行结果如下图所示：

图4.1 ConfigDemoServlet程序的运行结果

（三）ServletContext的使用

修改上面程序，将email地址和电话使用ServletContext初始化参数传递给ConfigDemoServlet。使用ServletContext对象将email地址和电话信息写入日志文件中，并查看日志文件。

（五）下面是一个Servlet，它可以获得有关服务器的信息。 package com.demo; import java.io.*; import java.util.*; import javax.servlet.*;

public class ServerInfo extends GenericServlet {

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public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { response.setContentType(\ PrintWriter out = response.getWriter(); ServletContext sc = getServletContext(); out.println(\ out.println(\ out.println(\ out.println(\获取服务器端信息\ out.println(\ out.println(\ out.println(\服务器端信息：\ out.println(\ out.println(\ out.println(\站点名\ out.println(\ out.println(\ out.println(\ out.println(\端口号\ out.println(\ out.println(\ out.println(\ out.println(\服务器类型\ out.println(\ out.println(\ out.println(\ out.println(\支持Servlet版本\ out.println(\ out.println(\ out.println(\ out.println(\服务器属性\ out.println(\ // 获得服务器属性集合 Enumeration attributes = sc.getAttributeNames(); while (attributes.hasMoreElements()) { String name = (String)attributes.nextElement(); out.println(name); } out.println(\ out.println(\ out.println(\ out.println(\ out.println(\ } }

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