JSP 自定义标签例子(BodyTagSupport)

1.在WEB-INF下新建一个stag.tld文件 

<?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>

        <tlibversion>1.0</tlibversion>

        <jspversion>1.1</jspversion>

        <shortname>tbl</shortname>

   <tag>

        <name>stag</name>

        <tagclass>test.MyTag</tagclass>

        <bodycontent>JSP</bodycontent>

        <info>To Convert in Upper case tag</info>

   </tag>

</taglib>

2.

package test;



import javax.servlet.*;

import javax.servlet.jsp.*;

import javax.servlet.jsp.tagext.*;

import java.util.*;

import java.io.*;



public class MyTag extends BodyTagSupport 

{

    public int doAfterBody() throws JspException {

      try {

         BodyContent bodycontent = getBodyContent();

         System.out.println("---------bodycontent---------:"+bodycontent);

         String body = bodycontent.getString();

         System.out.println("---------body---------:"+body);

         JspWriter out = bodycontent.getEnclosingWriter();

         System.out.println("---------out---------:"+out);

         if(body != null) {

            out.print(body.toUpperCase());

         }

      } catch(IOException ioe) {

         throw new JspException("Error:"+ioe.getMessage());

      }

      return SKIP_BODY;

  }



    @Override

    public int doEndTag() throws JspException {

        System.out.println("---------doEndTag()----------");

        return super.doEndTag();

    }



    @Override

    public void doInitBody() throws JspException {

        System.out.println("---------doInitBody()----------");

        super.doInitBody();

    }



    @Override

    public int doStartTag() throws JspException {

        System.out.println("---------doStartTag()----------");

        return super.doStartTag();

    }

}

 

3.

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%@ taglib uri="/WEB-INF/stag.tld" prefix="tbl" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    

    <title>My JSP 'index.jsp' starting page</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>

    <tbl:stag>

        hello ! BodyTagSupport例子

    </tbl:stag>

  </body>

</html>

 

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