JSP实时显示当前系统时间的四种方式示例解析

网络编程 JSP实时显示,JSP当前系统时间 06-18

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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