簡單的計算器
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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>簡單計算器</title>
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</head>
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<body>
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<h1>簡單計算器</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="計算" />
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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>簡單計算器</title>
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</head>
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<body>
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<h1>簡單計算器</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>
這裡有個小插曲，就是在WEB-INF文件夾下面，在lib的目錄中必須有jstl.jar和standard.jar這兩個jar包
摘自 張大鵬的博客
