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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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