文章摘要
文章介绍了在JSP中显示当前系统时间的四种方法，分别如下：
1. **直接使用Java内置时间类**：通过`java.text.SimpleDateFormat`格式化当前时间，并使用`java.util.Date`获取当前时间。
2. **使用JSP内置@useBean**：通过`jsp:useBean`引用`java.util.Date`类，直接获取并显示时间。
3. **使用@useBean with type和beanName**：结合`type`和`beanName`参数灵活配置，通过引用`java.util.Date`类获取时间。
4. **使用jsp:setProperty设置属性**：通过手动设置属性值的方式，分别获取小时、分钟、秒，并组合显示当前时间。
这些方法展示了在JSP中灵活获取和显示系统时间的多种方式，适合不同场景的应用。
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=”https://www.jb51.net/article/<%=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=”https://www.jb51.net/article/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=”https://www.jb51.net/article/<%=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=”https://www.jb51.net/article/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=”https://www.jb51.net/article/<%=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=”https://www.jb51.net/article/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=”https://www.jb51.net/article/<%=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=”https://www.jb51.net/article/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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