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jsp:tld标签

时间:2018-01-12 23:23:21      阅读:54      评论:0      收藏:0      [点我收藏+]

标签:println   打印   public   nal   head   void   换行   long   protect   

z注意每个uri地址要保持统一

 

1.创建MytagPrinta.java文件

package cn.tag;

import java.io.IOException;

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

public class MytagPrinta extends TagSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	
	protected String value = null;
	protected String type = "0";
	
	

	
	public String getValue() {
		return value;
	}


	public void setValue(String value) {
		this.value = value;
	}


	public String getType() {
		return type;
	}


	public void setType(String type) {
		this.type = type;
	}



	@Override
	public int doStartTag() throws JspException {
		// TODO Auto-generated method stub

		try {
			if(type.equals("0"))
			{
				pageContext.getOut().println("hello:" + value);
			}else{
				pageContext.getOut().print("hell:"+value+"<br>");
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			throw new JspTagException( e.getMessage() );
		}	
		
		return SKIP_PAGE;
	}
	
	
	@Override
	public int doEndTag() throws JspException {
		// TODO Auto-generated method stub
		return EVAL_PAGE;
	}
	

	
	
	
}

  

2.配置web-info下的web.xml文件

<jsp-config>
    <taglib>  
		<taglib-uri>http://www.tag.com/mytag</taglib-uri>  
		<taglib-location>/WEB-INF/mytlds/mytag.tld</taglib-location>  
	 </taglib> 
	 
 </jsp-config>

  3.web-info下的mytlds文件夹下创建 mytag.tld

<?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">
<description>mytag 带type和value属性的打印</description>
<display-name>mytag 标签库</display-name>
<tlib-version>1.0</tlib-version>
<short-name>mytag</short-name>
<uri>http://www.tag.com/mytag</uri>

<tag>
	<description>打印value和type</description>
	<name>printa</name>
	<tag-class>cn.tag.MytagPrinta</tag-class>
	<body-content>empty</body-content>
	<attribute>
		<name>type</name>
		<required>false</required>
		<rtexprvalue>true</rtexprvalue>
	</attribute>
	<attribute>
		<name>value</name>
		<required>true</required>
		<rtexprvalue>true</rtexprvalue>
	</attribute>
	
</tag>

</taglib>

  

4.新建tag.jsp文件。调用

<%@ page language="java" contentType="text/html; charset=utf-8"%>
<%@ taglib prefix="mytag" uri="http://www.tag.com/mytag" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>带属性标签实例</title>
</head>
<body>

<h3>调用带属性的print标签</h3>
打印后换行: <mytag:printa value="print" type="1"/>
打印后不换行:<mytag:printa value="printa" type="0"/>

</body>
</html>

  

 

jsp:tld标签

标签:println   打印   public   nal   head   void   换行   long   protect   

原文:https://www.cnblogs.com/achengmu/p/8277847.html

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