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.com/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://com.demo.util.datejstl/tags</uri>
<tag>
<name>date</name>
<tag-class>com.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://com.demo.util.datejstl/tags" prefix="date"%>

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