JSP:使用EL表达式调用java函数

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JSP:使用EL表达式调用java函数

使用一个例子

编写一个使用JSP表达式语言的JSP程序，输入一个数字，提交后输出该数字的九九乘法表。

java代码实现打印9*9乘法表
Solution.java

package method;public class Solution {    public static String Mul99(int n){        String result="";        for(int i=1;i<=9;i++){            int temp=i*n;            result=result+i+" X "+n+"="+temp+"<br>";        }        return result;    }    public static void main(String[] args){        System.out.print(Mul99(4));    }}

在WEB-INF下建立文件
utils.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>MY Util 1.1 functions library</description>  <display-name>MY Util functions</display-name>  <tlib-version>1.1</tlib-version>  <short-name>mfn</short-name>  <uri>http://www.inspuruptec.com/jsp/jstl/util</uri>  <function>    <description>      mul99    </description>    <name>mul</name>    <function-class>method.Solution</function-class>    <function-signature>java.lang.String Mul99(int)</function-signature>    <example>    </example>  </function></taglib>

99.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%><%@taglib uri="http://www.inspuruptec.com/jsp/jstl/util" prefix="fn"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>    <head>        <base href="<%=basePath%>">        <title>My JSP '99.jsp' starting page</title>        <meta http-equiv="pragma" content="no-cache">        <meta http-equiv="cache-control" content="no-cache">        <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">        <meta http-equiv="description" content="This is my page">        <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->    </head>    <body>        <center>            <form method="POST">                输入一个数                <input type="text" name="num">                <br>                <input type="submit" value="99乘法" />            </form>            ${fn:mul((param.num)) }        </center>    </body></html>

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