可以用jstl里面的format标签，很方便
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<fmt:parseDate value="${param.date}" var="date" pattern="yyyy/MM/dd:HH:mm:ss>
<fmt:parseDate value="${param.isoDate}" var="isoDate" pattern="yyyyMMdd'T'HHmmss">
The input parameters must match the patterns, or the JSP will thrown an exception. This page does no error handling.
Input parameters:
Date: 2004/04/01:13:30:00 Java format: Thu Apr 01 13:30:00 CST 2004
isoDate: 20040531T235959 Java format: Mon May 31 23:59:59 CDT 2004
Dates
Tag Output
Attribute: value; required. Tag has no body.
<fmt:formatDate value="${date}" type="both"/>
2004-4-1 13:30:00
<fmt:formatDate value="${isoDate}" type="both"/>
2004-5-31 23:59:59
Attribute: type; optional. Indicates what to print: date, time, or both.
<fmt:formatDate value="${date}" type="date"/>
2004-4-1
<fmt:formatDate value="${isoDate}" type="time"/>
23:59:59
Attribute: dateStyle; optional. Varies the date format.
<fmt:formatDate value="${isoDate}" type="date" dateStyle="default"/>
2004-5-31
<fmt:formatDate value="${isoDate}" type="date" dateStyle="short"/>
04-5-31
<fmt:formatDate value="${isoDate}" type="date" dateStyle="medium"/>
2004-5-31
<fmt:formatDate value="${isoDate}" type="date" dateStyle="long"/>
2004年5月31日
<fmt:formatDate value="${isoDate}" type="date" dateStyle="full"/>
2004年5月31日 星期一
Attribute: timeStyle; optional. Varies the time format.
<fmt:formatDate value="${isoDate}" type="time" timeStyle="default"/>
23:59:59
<fmt:formatDate value="${isoDate}" type="time" timeStyle="short"/>
下午11:59
<fmt:formatDate value="${isoDate}" type="time" timeStyle="medium"/>
23:59:59
<fmt:formatDate value="${isoDate}" type="time" timeStyle="long"/>
下午11时59分59秒
<fmt:formatDate value="${isoDate}" type="time" timeStyle="full"/>
下午11时59分59秒 CDT
Attribute: pattern; optional. Inidcates date/time custom patterns.
<fmt:formatDate value="${date}" type="both" pattern="EEEE, MMMM d, yyyy HH:mm:ss Z"/>
星期四, 四月 1, 2004 13:30:00 -0600
<fmt:formatDate value="${isoDate}" type="both" pattern="d MMM yy, h:m:s a zzzz/>