JSP实时显示当前系统时间的四种方式示例解析

JSP显示当前系统时间的四种方式:

第一种java内置时间类实例化对象:

  <%@ page language="java" import="java.util.*" pageEncoding="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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >        <title>My JSP 'time4.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >  	-->      </head>      <body>    <%    java.text.SimpleDateFormat simpleDateFormat = new java.text.SimpleDateFormat(      "yyyy-MM-dd HH:mm:ss");     java.util.Date currentTime = new java.util.Date();     String time = simpleDateFormat.format(currentTime).toString();    out.println("当前时间为:"+time);     %>        </body>  </html>

第二种方式使用JSP内置USEBEAN实例化时间类:

  <%@ page language="java" import="java.util.*" pageEncoding="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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >        <title>显示系统时间方法一:</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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >  	-->      </head>      <body>    <jsp:useBean id="time" class="java.util.Date"/>    	现在时间:<%=time%>   </body>  </html>

第三种方式使用JSP USEBEAN type与beanName配对使用:

  <%@ page language="java" import="java.util.*" pageEncoding="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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >        <title>My JSP 'time2-useBean-type-beanName.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >  	-->      </head>      <body>     <jsp:useBean id="time" type="java.io.Serializable" beanName="java.util.Date"/>    	现在时间:<%=time%>   </body>  </html>

第四种方式使用JSP setproperty设置属性:

  <%@ page language="java" import="java.util.*" pageEncoding="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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >        <title>My JSP 'time3-setproperty.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >  	-->      </head>      <body>    jsp:setproperty 实例<hr>    <jsp:useBean id="time" class="java.util.Date">    	<jsp:setProperty name="time" property="hours" param="hh"/>    	<jsp:setProperty name="time" property="minutes" param="mm"/>    	<jsp:setProperty name="time" property="seconds" param="ss"/>    </jsp:useBean>    <br>    设置属性后的时间:${time} }    <br>       </body>  </html>

所有代码均能直接复制到MYECLIPSE2010

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JSP实时显示当前系统时间的四种方式示例解析

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