package mytag;
import java.util.*;
import java.io.IOException;
import java.text.*;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class MyTag extends TagSupport {
String format = null;
public String getFormat() {
return format;
}
public void setFormat(String format) {
this.format = format;
}
@Override
public int doEndTag() throws JspException {
// TODO Auto-generated method stub
SimpleDateFormat sf = null;
if (format.equals("date")) {
sf = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss z");
try {
pageContext.getOut().print(sf.format(new Date()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else if (format.equals("time")) {
sf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
try {
pageContext.getOut().print(sf.format(new Date()));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return EVAL_PAGE;
}
@Override
public int doStartTag() throws JspException {
// TODO Auto-generated method stub
return SKIP_BODY;
}
}
在WEB-INF目錄中建立一個子目錄 名字爲taglib 在目錄中創建tld文件
mytag.tld
<?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/j2ee/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>simple</short-name>
<uri>http://www.zhao.com/mytag</uri>
<description>
A simple tab library for the examples
</description>
<tag>
<name>mytag</name>
<tag-class>mytag.MyTag</tag-class>
<description> Display JSP sources </description>
<attribute>
<name>format</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
新建一個jsp頁面進行測試
<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%>
<%@taglib prefix="mytag" uri="http://www.zhao.com/mytag" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>Insert title here</title>
</head>
<body>
<mytag:mytag format="date"></mytag:mytag>
</body>
</html>