JSP+JavaBean简单计算器

来源：互联网发布：宠物公墓小说知乎编辑：程序博客网时间：2024/06/05 04:30

package bean;public class CalculatorBean {private double firstNum;private double secondNum;private char operator='+';private double result;public double getFirstNum() {return firstNum;}public void setFirstNum(double firstNum) {this.firstNum = firstNum;}public double getSecondNum() {return secondNum;}public void setSecondNum(double secondNum) {this.secondNum = secondNum;}public char getOperator() {return operator;}public void setOperator(char operator) {this.operator = operator;}public double getResult() {return result;}public void setResult(double result) {this.result = result;}public void calculate(){switch(this.operator){case'+':{this.result=this.firstNum+this.secondNum;break;}case'-':{this.result=this.firstNum-this.secondNum;break;}case'*':{this.result=this.firstNum*this.secondNum;break;}case'/':{if(this.secondNum==0){throw new RuntimeException("被除数不能为0！");}this.result=this.firstNum/this.secondNum;break;}default:throw new RuntimeException("对不起，输入的运算符非法!");  }}}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head></head><body><jsp:useBean id="CalculatorBean" class="bean.CalculatorBean"></jsp:useBean><jsp:setProperty name="CalculatorBean" property="*" /><%CalculatorBean.calculate();%><br /><hr><br /> 计算的结果是：<jsp:getProperty name="CalculatorBean" property="firstNum" /><jsp:getProperty name="CalculatorBean" property="operator" /><jsp:getProperty name="CalculatorBean" property="secondNum" />=<jsp:getProperty name="CalculatorBean" property="result" /><br /><hr><br /><form action="/calculator/index.jsp" method="post"style="text-align: center"><table border="1" width="50%"><tr style="text-align: center"><td colspan="2">简单计算器</td><td></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="operator"><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="计 算"></td></tr></table></form></body></html>

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