springmvc下设定自定义标签

最新推荐文章于 2021-05-30 21:26:01 发布

原创最新推荐文章于 2021-05-30 21:26:01 发布 · 392 阅读

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本文详细介绍如何通过继承TagSupport类创建自定义JSP标签，包括编写标签类、配置tld描述文件及在JSP页面中引用使用的过程。

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1编写自定义标签类，继承TagSupport

package com.itheima.crm.utils;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

public class MyTag extends TagSupport {

	@Override
	public int doStartTag() throws JspException {
		JspWriter out = super.pageContext.getOut();
		try {
			out.print("<span>这是自定义标签输出的内容</span>");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return super.doStartTag();
	}

}

2.编写tld描述文件

<?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>2.0</tlib-version>
	<jsp-version>1.2</jsp-version>
	<short-name>myTag</short-name>
	<uri>http://itheima/myTag/</uri>
	<display-name>Common Tag</display-name>
	<description>Common Tag library</description>

	<tag>
		<name>out</name>
		<tag-class>com.itheima.crm.utils.MyTag</tag-class>
		<body-content>JSP</body-content>
	</tag>
</taglib>

3使用自定义标签采用页面引入的方式

<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
   <%@taglib  uri="http://itheima/myTag/" prefix="t"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
</head>
<body>
<t:out></t:out>
</body>
</html>