JSTL 自定义标签

xiaoxiao2021-02-28 8

<?xml version="1.0" encoding="UTF-8" ?> <taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd" version="2.0"> <description>JSTL 1.1 core library</description> <display-name>JSTL core</display-name> <tlib-version>1.1</tlib-version> <short-name>weijia</short-name> <uri>http://www.test.cn/mytag</uri> <tag> <description> my first tag </description> <name>testTag</name> <tag-class>com.jstl.TestJSTL</tag-class> <body-content>jsp</body-content> </tag>

</taglib>

package com.jstl; import java.text.SimpleDateFormat; import java.util.Date; import javax.servlet.http.HttpServletRequest; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; /** * 类说明 * * @author 肖荷山 * @version 创建时间：2017年11月11日上午10:12:31 */ public class TestJSTL extends TagSupport { /** * */ private static final long serialVersionUID = -9073988449891220898L; @Override public int doStartTag() throws JspException { JspWriter out = this.pageContext.getOut(); String sdf = new SimpleDateFormat("yyyy-MM-dd HH : mm : ss").format(new Date()); try { out.print(sdf); } catch (Exception e) { throw new RuntimeException(e); } finally { System.out.println("==================================================================执行这里"); } return super.doStartTag(); } }

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://www.test.cn/mytag" prefix="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=UTF-8"> <title>Insert title here</title> </head> <body> <h1>=====================loginout</h1> <mytag:testTag /> </body> </html>

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