- 创建一个类,引入外部jsp-api.jar包(在tomcat 下lib包里有),这个类继承SimpleTagSupport
- 重写doTag()方法。
jspprojec包下的helloTag类:
public class helloTag extends SimpleTagSupport{ @Override public void doTag() throws JspException, IOException { JspWriter out=this.getJspContext().getOut(); out.print("你好我是自定义标签"); } }
- 定义配置文件,这个文件放在webContent目录下的tags包里,文件扩展名为.tld 。
<taglib 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"
version="2.1">
<tlib-version>1.2</tlib-version>
<short-name>my</short-name>
<uri>my/jsp/jstl/my_hi</uri>
<tag>
<name>hi</name> //标签名
<tag-class>jspprojec.helloTag</tag-class> //自定义标签类
<body-content>empty</body-content>
</tag>
</taglib>
- 在jsp中使用自定义标签:
<%@page import="java.util.ArrayList,java.util.ArrayList,jspprojec.Student"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="my" uri="tags/my.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>Insert title here</title> </head> <body> <my:hi/> </body> </html>
结果: