JSP自定义标签

准备资料

【tld示例】

<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanse"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2.1.xsd" 
	version="2.1">
	<tlib-version>1.0</tlib-version>
	<short-name>name</short-name>

</taglib>

　　需要建立三个文件.java .tld .jsp

 

java代码：

package com.zhiqi.testTaglib;

import java.io.IOException;

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

public class TestTaglib extends TagSupport {
	private static final long serialVersionUID = 1L;

	@Override
	public int doStartTag() throws JspException {
		JspWriter jOut=this.pageContext.getOut();
		try {
			jOut.println("welcome");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return TagSupport.SKIP_BODY;
	}

	
}

　　tld代码：

<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanse"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2.1.xsd" 
	version="2.1">
	<tlib-version>1.0</tlib-version>
	<short-name>nam</short-name>
	
	<tag>
		<name>myTag</name>
		<tag-class>com.zhiqi.testTaglib.TestTaglib</tag-class>
		<body-content>empty</body-content>
	</tag>
	
</taglib>

　　jsp代码：

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
    <%@ taglib prefix="myTa" uri="/WEB-INF/zhiqi.tld" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Test TagLib</title>
</head>
<body>
<h3>测试JSP自定义标签</h3>

<myTa:myTag/>

</body>
</html>

　　原理画图如下:

【带name属性的标签】

package com.zhiqi.testTaglib;

import java.io.IOException;

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

public class TestTaglib extends TagSupport {
	private static final long serialVersionUID = 1L;
	
	private String name;
	
	public void setName(String name){
		this.name=name;
	}
	public String getName(){
		return this.name;
	}
	
	@Override
	public int doStartTag() throws JspException {
		JspWriter jOut=this.pageContext.getOut();
		try {
			jOut.println(name+" "+"welcome");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return TagSupport.SKIP_BODY;
	}

	
}

　　

<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanse"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2.1.xsd" 
	version="2.1">
	<tlib-version>1.0</tlib-version>
	<short-name>nam</short-name>
	
	<tag>
		<name>myTag</name>
		<tag-class>com.zhiqi.testTaglib.TestTaglib</tag-class>
		<body-content>empty</body-content>
		
		<attribute>
			<name>name</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>
</taglib>

　　

<myTa:myTag name="ooqq" />

　　【】

 

posted @ 2016-12-19 14:17  梦碎轻抚尘埃  阅读(145)  评论(0)    收藏  举报