jsp---简单的计算器

简单的计算器

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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<!DOCTYPE html>
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<html>
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    <head>
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        <title>简单计算器</title>
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    </head>
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    <body>
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        <h1>简单计算器</h1>
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        <hr />
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        <form action="result.jsp">
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            <input type="text" name="number1"/>
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            <select name="ope">
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                <option value="add">+</option>
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                <option value="minus">-</option>
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                <option value="multiply">*</option>
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                <option value="div">/</option>
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            </select>
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            <input type="text" name="number2"/>
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            <input type="submit" value="计算" />
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            <input type="reset" value="重置">
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        </form>
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    </body>
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</html>
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<%@page language="java" contentType="text/html;charset=gb2312"%>
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<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
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<!DOCTYPE html>
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<html>
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    <head>
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        <title>简单计算器</title>
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    </head>
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    <body>
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        <h1>简单计算器</h1>
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        <hr />
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        <c:if test="${param.ope == 'add'}">
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        ${param.number1} + ${param.number2} = ${param.number1 + param.number2}
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        </c:if>
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        <c:if test="${param.ope == 'minus'}">
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        ${param.number1} - ${param.number2} = ${param.number1 - param.number2}
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        </c:if>
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        <c:if test="${param.ope == 'multiply'}">
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        ${param.number1} * ${param.number2} = ${param.number1 * param.number2}
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       </c:if>
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        <c:if test="${param.ope == 'div'}">
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        ${param.number1} / ${param.number2} = ${param.number1 / param.number2}
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        </c:if>
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    </body>
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</html>
这里有个小插曲，就是在WEB-INF文件夹下面，在lib的目录中必须有jstl.jar和standard.jar这两个jar包

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补充：Web开发 , Jsp ,