(一) request

　　主要方法如下,
<%@ page language="java" import="java.util.*" contentType="text/html;  charset=GB2312"%>

<html>
  <head>
    <title>request主要方法的使用</title>
  </head>
  <body>
    <font size="2">
      request主要方法的调用示例:<br>
      <%
          request.setAttribute("attr", "Hello!");
          out.print("attr属性值为:"+request.getAttribute("attr")+"<br>");
          out.print("上下文的路径为:"+request.getContextPath()+"<br>");
          out.print("Cookies:"+request.getCookies()+"<br>");
          out.print("Host:"+request.getHeader("Host")+"<br>");
          out.print("ServerName: "+request.getServerName()+"<br>");
          out.print("ServerPort: "+request.getServerPort()+"<br>");
          out.print("RemoteAddr: "+request.getRemoteAddr()+"<br>");
          request.removeAttribute("attr");
          out.print("属性移除操作之后attr属性的值为: "+request.getAttribute("attr")+"<br>");
       %>
    </font>
  </body>
</html>
运行结果: