JSP小執行個體--計算機

最後更新：2013-11-06 來源：互聯網

上載者：User

創建阿里雲帳戶，並獲得超過 40 款產品的免費試用版；而企業帳戶則可以享有總值 $1200 的免費試用版。立即註冊！

package cn.com.caculate;import java.math.BigDecimal;public class caculate {private String firstNum="0";private String secondNum="0";private char operator='+';private String result="0";public String getFirstNum() {return firstNum;}public void setFirstNum(String firstNum) {this.firstNum = firstNum;}public String getSecondNum() {return secondNum;}public void setSecondNum(String secondNum) {this.secondNum = secondNum;}public char getOperator() {return operator;}public void setOperator(char operator) {this.operator = operator;}public String getResult() {return result;}public void setResult(String result) {this.result = result;}public void calculate(){BigDecimal first=new BigDecimal(this.firstNum);BigDecimal second=new BigDecimal(this.secondNum);switch(this.operator){case '+':this.result=first.add(second).toString();break;case '-':this.result=first.subtract(second).toString();break;case '*':this.result=first.multiply(second).toString();break;case '/':if(second.doubleValue()==0){throw new RuntimeException("除零異常！");}this.result=first.divide(second, 20, BigDecimal.ROUND_HALF_UP).toString();break;default:throw new RuntimeException("操作有錯誤！");}}}<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'calculator.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 style="text-align:center;">  <jsp:useBean id="caculate" class="cn.com.caculate.caculate"></jsp:useBean>  <jsp:setProperty name="caculate" property="*"/>  <%  try{  caculate.calculate();   }   catch(Exception e){      out.write(e.getMessage());   }   %>   <br/>-----------------------------------------------------<br/>   計算結果是：   <jsp:getProperty name="caculate" property="firstNum"/>   <jsp:getProperty name="caculate" property="operator"/>   <jsp:getProperty name="caculate" property="secondNum"/>   =   <jsp:getProperty name="caculate" property="result"/>   <br/>-----------------------------------------------------<br/>  <form action="calculator.jsp" method="post">  <table width="404" border="1">  <tr>  <td colspan="3">簡單的計算機</td>  </tr>  <tr>  <td>第一個數</td>  <td>  <input type="text" name="firstNum"/>  </td>  </tr>  <tr>  <td>選擇操縱</td>  <td>  <select name="operator">  <option value='+'>+</option>  <option value='-'>-</option>  <option value='*'>*</option>  <option value='/'>/</option>  </select>  </td>  </tr>  <tr>  <td>第二個數</td>  <td>  <input type="text" name="secondNum"/>    </td>  </tr>  <tr>  <td colspan="3">  <input type="submit" value="計算"/>  </td>  </tr>  </table>    </form>  </body></html>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More