（1）編寫jsp頁面，用戶通過表單輸入兩個(gè)操作數(shù)和運(yùn)算符，調(diào)用該頁面自身處理該表單，通過調(diào)用SimpleCalculator類的實(shí)例實(shí)現(xiàn)運(yùn)算邏輯，并顯示運(yùn)算結(jié)果。
（2）實(shí)現(xiàn)下邊的jsp網(wǎng)頁計(jì)算器：

二、代碼實(shí)現(xiàn)

（1）jsp頁面

<%@page import="com.beans.SimpleCalculator"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
? ? pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>計(jì)算器</title>
</head>
<body>
? ? ? ? ? ?
? ? ? ?<form action="" method="post">
? ? ? ??? ??? ?第一個(gè)數(shù)：<input type="text" value="" name="first" size="25px"/>
? ? ? ??? ??? ?<br /><br />
? ? ? ??? ??? ?第二個(gè)數(shù)：<input type="text" value="" name="second" size="25px"/>
? ? ? ??? ??? ?<br /><br />
? ? ? ??? ??? ?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
? ? ? ??? ??? ?<input type="submit" value="+" name="operator" size="3"/> ?&nbsp;&nbsp;&nbsp;
? ? ? ??? ??? ?<input type="submit" value="-" name="operator" size="3"/>  &nbsp;&nbsp;&nbsp;
? ? ? ??? ??? ?<input type="submit" value="*" name="operator" size="3"/> ?&nbsp;&nbsp;&nbsp;
? ? ? ??? ??? ?<input type="submit" value="/" name="operator" size="3"/> ?&nbsp;&nbsp;&nbsp;
?? ??? ??? ??? ?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
?? ??? ??? ??? ?<input type="reset" value="清除"/>
? ? ? ?</form>
? ? ? ? <br /><br />
? ? ? ??? ??? ?<%
? ? ? ??? ??? ?
? ? ? ??? ??? ??? ??? ??? ?//獲取表單中的數(shù)據(jù)進(jìn)行運(yùn)算
?? ??? ??? ??? ??? ??? ?String first = request.getParameter("first");//第一個(gè)數(shù)
?? ??? ??? ??? ??? ??? ?String second = request.getParameter("second");//第二個(gè)數(shù)
?? ??? ??? ??? ??? ??? ?String operator = request.getParameter("operator");//運(yùn)算符
?? ??? ??? ??? ? ?? ??? ?String result = "" ;//運(yùn)算結(jié)果
?? ??? ??? ??? ? ?? ??? ?
? ? ? ??? ??? ??? ??? ??? ?//判斷運(yùn)算符
? ? ? ??? ??? ??? ??? ??? ?if(operator.equals("+")) {
? ? ? ??? ??? ??? ??? ??? ??? ?result = String.valueOf((Integer.valueOf(first) + Integer.valueOf(second) ));
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?if(operator.equals("-")) {
? ? ? ??? ??? ??? ??? ??? ??? ?result = String.valueOf((Integer.valueOf(first) - Integer.valueOf(second) ));
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?if(operator.equals("*")) {
? ? ? ??? ??? ??? ??? ??? ??? ?result = String.valueOf((Integer.valueOf(first) * Integer.valueOf(second) ));
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?if(operator.equals("/")) {
? ? ? ??? ??? ??? ??? ??? ??? ?
? ? ? ??? ??? ??? ??? ??? ??? ?if(second.equals("0")) {
? ? ? ??? ??? ??? ??? ??? ??? ??? ?result = "除數(shù)不能為0";
? ? ? ??? ??? ??? ??? ??? ??? ?}else {
? ? ? ??? ??? ??? ??? ??? ??? ??? ?result = String.valueOf((double)(Integer.valueOf(first) / (double)Integer.valueOf(second) ));
? ? ? ??? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?
? ? ? ??? ??? ??? ??? ??? ?//定義一個(gè)計(jì)算器類
? ? ? ??? ??? ??? ??? ??? ?SimpleCalculator simpleCalculator = new SimpleCalculator();
? ? ? ??? ??? ??? ??? ??? ?simpleCalculator.setResult(result);
? ? ? ??? ??? ??? ??? ??? ?if( !simpleCalculator.getResult().equals("") && simpleCalculator.getResult() != null){
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("<h2 style= 'color: blue'>");
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("計(jì)算結(jié)果："+first+operator+second+" = "+simpleCalculator.getResult());
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("<h4>");
? ? ? ??? ??? ??? ??? ??? ?}else{
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("計(jì)算錯(cuò)誤");?
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ?
? ? ? ??? ??? ??? ??? ?%>
? ? ? ??? ??? ??? ??? ? ?<br /><br />
</body>
</html>

（2）SimpleCalculator類

public class SimpleCalculator {
?? ?
?? ?//定義變量
?? ?private String first;//第一個(gè)數(shù)
?? ?private String second;//第二個(gè)數(shù)
?? ?private String operator;//運(yùn)算符
?? ?private String result;//運(yùn)算結(jié)果
?? ?
?? ?//定義set和get方法
?? ?public String getFirst() {
?? ??? ?return first;
?? ?}
?? ?public void setFirst(String first) {
?? ??? ?this.first = first;
?? ?}
?? ?public String getSecond() {
?? ??? ?return second;
?? ?}
?? ?public void setSecond(String second) {
?? ??? ?this.second = second;
?? ?}
?? ?public String getOperator() {
?? ??? ?return operator;
?? ?}
?? ?public void setOperator(String operator) {
?? ??? ?this.operator = operator;
?? ?}
?? ?public String getResult() {
?? ??? ?return result;
?? ?}
?? ?public void setResult(String result) {
?? ??? ?this.result = result;
?? ?}
?? ?
?? ?
}

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