jsp+javaBean計算機の例

8499 ワード
javabean 
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> ：</td>
                <td><input type="text" name="firstNumber"/>
                </td>
            </tr>
            <tr>
                <td> ：</td>
                <td><select name="operator">
                        <option value="+">+</option>
                        <option value="-">-</option>
                        <option value="*">*</option>
                        <option value="/">/</option>
                </select></td>
            </tr>
            <tr>
                <td> ：</td>
                <td><input type="text" name="secondNumber"/></td>
            </tr>
            <tr>
                <td><input type="submit"/>  ：</td>
                <td><span id="result"><%=calculator.getResult() %></span></td>
            </tr>
        </table>
    </form>
</body>
</html>

 
クッサFE学校-4月7日
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