jsp页面中如何将时间戳字符串格式化为时间标签

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun./dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>date</short-name>
<uri>http://.demo.util.datejstl/tags</uri>
<tag>
<name>date</name>
<tag-class>.demo.util.jstl.JSTLUtil</tag-class>
<attribute>
<name>value</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>parttern</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>

<%@ taglib uri="http://.demo.util.datejstl/tags" prefix="date"%>

<date:date value="${time}" parttern="yyyy-MM-dd HH:mm:ss"></date:date></div>