自定义el函数

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JSTL的Functions标签库提供的函数有限，如果需要，可以自行开发el函数。

Function.java：

public class Function {public static String makeSecondUpperCase(String str){return str.substring(0,1)+str.substring(1,2).toUpperCase()+str.substring(2);}public static String cutLastChar(String str){return str.substring(0,str.length()-1);}}

myfn.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>JSTL 1.1 functions library</description>  <display-name>JSTL functions</display-name>  <tlib-version>1.1</tlib-version>  <short-name>f</short-name>  <uri>www.dragon.com</uri>  <function>    <name>makeSecondUpperCase</name>    <function-class>com.function.Function</function-class>    <function-signature>String makeSecondUpperCase(java.lang.String)</function-signature>  </function>    <function>    <name>cutLastChar</name>    <function-class>com.function.Function</function-class>    <function-signature>String cutLastChar(java.lang.String)</function-signature>  </function>    </taglib>

test.jsp：

<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="func" uri="www.dragon.com" %><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>${func:makeSecondUpperCase("abcdefg")}<br>${func:cutLastChar("abcdefg")}</body></html>