jstl 自定义函数库

1.创建函数类：

package user;

public class MyFunction {

	public static String sayHello(String name){
		return "Hello "+name;
	}
}

2.创建tld文件

<?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>my</short-name>
  <uri>http://singlegogogo.com/myfunction</uri>

  <function>
    <name>say</name>
    <function-class>user.MyFunction</function-class>
    <function-signature>java.lang.String sayHello(java.lang.String)</function-signature>
  </function>

 </taglib>

3.jsp中引入taglib:

<%@ taglib prefix="my" uri="http://singlegogogo.com/myfunction" %>

4.使用自定义函数库

${my:say("jack") }