tOMCAT7自定义标签的开发

最新推荐文章于 2017-07-27 11:00:34 发布

原创最新推荐文章于 2017-07-27 11:00:34 发布 · 1.3k 阅读

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#自定义标签

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本文介绍如何在Tomcat7中创建并使用自定义的JSP标签，包括ShowTag类的实现及my.tld配置文件的设置，并展示了如何在JSP页面中调用这些标签。

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tomcat7与之前的版本有一些区别

直接上代码：

package tag;
import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;

/**
 * SimpleTag handler that prints "Hello, world!"
 */
public class ShowTag extends SimpleTagSupport {
    @Override
    public void doTag() throws JspException, IOException {
        getJspContext().getOut().write( "it time" );
    }
}

my.tld文件，放在WEB-INF目录下

<?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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
	version="2.0">

	<tlib-version>1.0</tlib-version>
	<short-name>show</short-name>
	<uri>/ownTag</uri>

	<tag>
		<description>Outputs Hello, World</description>
		<name>showTime</name>
		<tag-class>tag.ShowTag</tag-class>
		<body-content>empty</body-content>
	</tag>

</taglib>

jsp代码：

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="my" uri="/WEB-INF/my.tld"%>
<%
	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>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>
	This is my JSP page.
	<br>
	<my:showTime/>
</body>
</html>