JSP中out对象的实例详解

网络编程 2024/11/15 佚名

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JSP中out对象的实例详解

一什么是缓冲区

缓冲区：Buffer，所谓缓冲区就是内存的一块区域用来保存临时数据。

二 out对象

out对象是JspWrite类的实例，是向浏览器输出内容常用的对象。

三常用方法

四实例

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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%>" rel="external nofollow" >
  
  <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">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
    -->
 </head>
 
 <body>
  <h1>out内置对象</h1>
  <%
    out.println("<h2>静夜思</h2>");
    out.println("床前明月光<br>");
    out.println("疑是地上霜<br>");
    out.flush();
    //out.clear();//这里会抛出异常。
    out.clearBuffer();//这里不会抛出异常。
    out.println("举头望明月<br>");
    out.println("低头思故乡<br>");
  
  %>
    缓冲区大小：<%=out.getBufferSize() %>byte<br>
    缓冲区剩余大小：<%=out.getRemaining() %>byte<br>
    是否自动清空缓冲区：<%=out.isAutoFlush() %><BR>  
 </body>
</html>

五运行结果