使用jsp+javaBean写一个网页计算器

来源：互联网发布：数据建模视频编辑：程序博客网时间：2024/05/16 11:12

在学习jsp时写的练手的代码。

运行效果：

calculator.jsp代码：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>        <title>My JSP 'calculator.jsp' starting page</title>      <style>      body{text-align : center;   }body table tr td input{width:100%;height : 100%;}.container{align:center;}   </style>     </head>    <body >  <div>  <jsp:useBean id="calculatorBean" class = "cn.Lionel.domain.CalculatorBean"></jsp:useBean>    <jsp:setProperty property="*" name="calculatorBean"/>    <%  calculatorBean.calculate();   %>  <hr>  計算結果是：  <jsp:getProperty property="firstNum" name="calculatorBean"/>  <jsp:getProperty property="oper" name="calculatorBean"/>  <jsp:getProperty property="secondNum" name="calculatorBean"/>  =  <jsp:getProperty property="result" name="calculatorBean"/>  <hr>  <form action = "/day09/calculator.jsp" method = "get">    <table style="margin-right: auto;margin-left: auto;" width = "40%" border="1">        <tr>    <td colspan="2">简单计算器</td>    </tr>        <tr>    <td>第一个参数:</td>    <td><input type="text" name = "firstNum"> </td>    </tr>        <tr>    <td>运算符</td>    <td>    <select name = "oper">    <option value = "+">+</option>    <option value = "-">-</option>    <option value = "*">*</option>    <option value = "/">/</option>    </select>    </td>    </tr>        <tr>    <td>第二个参数</td>    <td><input type="text" name = "secondNum"></td>        </tr>        <tr>    <td colspan = 2 ><input type= "submit" value = "提交" name = "submit" style = "text-align:center"></td>    </tr>    </table>   </form>  </div>  </body></html>

CalculatorBean.java代码：

package cn.Lionel.domain;import java.math.BigDecimal;//封装计算器数据的Bean public class CalculatorBean {private String firstNum = "0" ;private String secondNum = "0";private char oper = '+';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 getOper() {return oper;}public void setOper(char oper) {this.oper = oper;}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.oper){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 '/':this.result = first.divide(second,20,BigDecimal.ROUND_HALF_UP).toString();break;default : break;}}}

没有什么好讲解的，都是一些入门的知识。

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