JSP中out對(duì)象的實(shí)例詳解

2024-09-05 00:23:25

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一什么是緩沖區(qū)

緩沖區(qū)：Buffer，所謂緩沖區(qū)就是內(nèi)存的一塊區(qū)域用來(lái)保存臨時(shí)數(shù)據(jù)。

二 out對(duì)象

out對(duì)象是JspWrite類(lèi)的實(shí)例，是向?yàn)g覽器輸出內(nèi)容常用的對(duì)象。

三常用方法

JSP,out對(duì)象

四實(shí)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內(nèi)置對(duì)象</h1>  <%    out.println("<h2>靜夜思</h2>");    out.println("床前明月光<br>");    out.println("疑是地上霜<br>");    out.flush();    //out.clear();//這里會(huì)拋出異常。    out.clearBuffer();//這里不會(huì)拋出異常。    out.println("舉頭望明月<br>");    out.println("低頭思故鄉(xiāng)<br>");    %>    緩沖區(qū)大?。?lt;%=out.getBufferSize() %>byte<br>    緩沖區(qū)剩余大?。?lt;%=out.getRemaining() %>byte<br>    是否自動(dòng)清空緩沖區(qū)：<%=out.isAutoFlush() %><BR>   </body></html>

五運(yùn)行結(jié)果

JSP,out對(duì)象