自定义标签
package taglibs; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import javax.servlet.jsp.JspException; import javax.servlet.jsp.PageContext; import javax.servlet.jsp.tagext.Tag; public class DateTag implements Tag{ private PageContext pageContext; private Tag tag; public int doEndTag() throws JspException { try{ Date date=new Date();//定义日期 SimpleDateFormat dateFormater=new SimpleDateFormat("yyyy年MM月dd日");//日期格式 pageContext.getOut().print(dateFormater.format(date)); }catch(IOException e){ e.printStackTrace(); } return Tag.EVAL_PAGE; } public int doStartTag() throws JspException {//开始标签 return Tag.SKIP_BODY; } public Tag getParent() { return null; } public void release() {} public void setPageContext(PageContext pageContext) { this.pageContext=pageContext; } public void setParent(Tag parent) { this.tag=parent; } }
标签库配置
<?xml version="1.0" encoding="UTF-8"?> <!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>dateTagExample</short-name> <uri>/mytags</uri> <tag> <name>date</name> <tag-class>taglibs.DateTag</tag-class> <body-content>empty</body-content> </tag> </taglib>
调用自定义标签
<%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312" pageEncoding="gb2312"%> <%@ taglib uri="/WEB-INF/datetag.tld" prefix="mytags"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>自定义标签示例</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <font size="2"> 下面是使用自定义标签输出的内容:<br> <mytags:date/> </font> </body> </html>