package com.wzh.test.domain;
import java.math.BigDecimal;
public class CalculatorBean {
private String firstNumber="0";
private char operator;
private String secondNumber="
package com.wzh.test.domain;
import java.math.BigDecimal;
public class CalculatorBean {
private String firstNumber="0";
private char operator;
private String secondNumber="0";
private String result;
public String getFirstNumber() {
return firstNumber;
}
public void setFirstNumber(String firstNumber) {
this.firstNumber = firstNumber;
}
public char getOperator() {
return operator;
}
public void setOperator(char operator) {
this.operator = operator;
}
public String getSecondNumber() {
return secondNumber;
}
public void setSecondNumber(String secondNumber) {
this.secondNumber = secondNumber;
}
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
public void calculate() {
BigDecimal firstBigDecimal = new BigDecimal(this.firstNumber);
BigDecimal secondBigDecimal = new BigDecimal(this.secondNumber);
switch (this.operator) {
case '+':
this.result = firstBigDecimal.add(secondBigDecimal).toString();
break;
case '-':
this.result = firstBigDecimal.subtract(secondBigDecimal).toString();
break;
case '*':
this.result = firstBigDecimal.multiply(secondBigDecimal).toString();
break;
case '/':
this.result = firstBigDecimal.divide(secondBigDecimal).toString();
break;
default:
break;
}
}
}
<%@ 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>
</head>
<body>
<jsp:useBean id="calculator" class="com.wzh.test.domain.CalculatorBean"></jsp:useBean>
<jsp:setProperty property="*" name="calculator"/>
<%
calculator.calculate();
%>
<jsp:getProperty property="firstNumber" name="calculator"/>
<jsp:getProperty property="operator" name="calculator"/>
<jsp:getProperty property="secondNumber" name="calculator"/>
=
<jsp:getProperty property="result" name="calculator"/>
<form action="/day09/calculator.jsp" method="post">
<table>
<tr>
<td>第一个数：</td>
<td><input type="text" name="firstNumber"/>
</td>
</tr>
<tr>
<td>操作符：</td>
<td><select name="operator">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select></td>
</tr>
<tr>
<td>第二个数：</td>
<td><input type="text" name="secondNumber"/></td>
</tr>
<tr>
<td><input type="submit"/> 结果：</td>
<td><span id="result"><%=calculator.getResult() %></span></td>
</tr>
</table>
</form>
</body>
</html>
