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" 
  
  titleMy 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" 
  
  titleMy 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" 
  
  titleMy 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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