JavaWeb之JSP自定义标签实例（属性：字体颜色、字体大小、链接地址）

自定义标签功能：
可以链接到网页：
名称：Mya
属性：字体颜色、字体大小、链接地址

Java类（继承TagSupport）：

package com.test;

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

public class Mya extends TagSupport {

		private String color = "";
		private String size = "";
		private String url = "";

		public void setColor(String color) {
				this.color = color;
		}

		public void setSize(String size) {
				this.size = size;
		}

		public void setUrl(String url) {
				this.url = url;
		}

		@Override
		public int doStartTag() throws JspException {
				try {
						JspWriter out = pageContext.getOut();
						out.print("<a style=\"color: "+color+";font-size: "+size+";\" href=\""+url+"\">");
				} catch (Exception e) {
						System.out.println(e);
				}
				return EVAL_PAGE;
		}

		@Override
		public int doEndTag() throws JspException {
				try{
						JspWriter out = pageContext.getOut();
						out.print("</a>");
				}catch (Exception e) {
						System.out.println(e);
				}
				return EVAL_PAGE;
		}

}

TLD文件（配置标签信息，映射java类）：

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.1" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd">
  <tlib-version>1.0</tlib-version>
  <short-name>mya</short-name>
  <uri>/WEB-INF/tlds/mya</uri>
		<tag>
				<name>mya</name>
				<body-content>scriptless</body-content>
				<tag-class>com.test.Mya</tag-class>
				<description>show a freestyle</description>
				
				<attribute>
						<name>color</name>
						<required>false</required>
						<rtexprvalue>false</rtexprvalue>
				</attribute>
				
				<attribute>
						<name>size</name>
						<required>false</required>
						<rtexprvalue>false</rtexprvalue>
				</attribute>
				
				<attribute>
						<name>url</name>
						<required>true</required>
						<rtexprvalue>false</rtexprvalue>
				</attribute>
		</tag>
</taglib>

测试页面（JSP）

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="/WEB-INF/tlds/mya" prefix="mytag"%>
<!DOCTYPE html>
<html>
		<head>
				<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
				<title>Mya</title>
		</head>
		<body>
				<mytag:mya url="https://www.baidu.com" color="green" size="100px">baidu</mytag:mya>
		</body>
</html>

运行结果：
运行结果1
运行结果2

Echo*

发布了68 篇原创文章 · 获赞 12 · 访问量 5220

私信关注

JavaWeb之JSP自定义标签实例（属性：字体颜色、字体大小、链接地址）

猜你喜欢