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  • JSTL 自定义

    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>
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  • 原文地址:https://www.cnblogs.com/mingforyou/p/2220500.html
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