如何在JSP中打印当前日期? [英] How to print current date in JSP?

问题描述

我想做这样的事情:

 <?php echo date('Y'); ?>

但是在.jsp文件中.我看到的所有教程都需要在某个地方构建类.我们正在运行appFuse和Tapestry.当然，其中之一(如果不是Java本身的话)可以为我们提供无需做任何额外工作即可执行此类操作的功能.

But then in a .jsp file. All the tutorials I'm seeing require building a class somewhere. We're running appFuse and Tapestry. Surely one of those (if not Java itself) provide us with something to do this sort of thing without all that overhead.

这似乎应该可以，但不能:

This seems like it should work, but doesn't:

 <%= new Date.getYear() %>

推荐答案

使用jsp:useBean构造java.util.Date实例并使用JSTL

Use jsp:useBean to construct a java.util.Date instance and use JSTL fmt:formatDate to format it into a human readable string using a SimpleDateFormat pattern.

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<jsp:useBean id="date" class="java.util.Date" />
Current year is: <fmt:formatDate value="${date}" pattern="yyyy" />

老式的 scriptlet 方法为:

<%= new java.text.SimpleDateFormat("yyyy").format(new java.util.Date()) %>

请注意，当您不使用@page import指令时，需要指定完整的合格类名，这很可能是造成问题的原因.但是不推荐使用十年.

Note that you need to specify the full qualified class name when you don't use @page import directives, that was likely the cause of your problem. Using scriptlets is however highly discouraged since a decade.

在 [jsp]标记信息页面中也对此进行了演示:)

This all is demonstrated in the [jsp] tag info page as well :)

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