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JSP实现简单网页计算器

　　本文标签：JSP,计算器

本文实例为大家分享了JSP实现简单网页计算器的具体代码，供大家参考，具体内容如下

一、构造一个简单的计算器，能够进行“+、—、*、/”运算

（1）编写jsp页面，用户通过表单输入两个操作数和运算符，调用该页面自身处理该表单，通过调用SimpleCalculator类的实例实现运算逻辑，并显示运算结果 。
（2）实现下边的jsp网页计算器：

二、代码实现

（1）jsp页面

<%@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>计算器</title>
</head>
<body>
? ? ? ? ? ?
? ? ? ?<form action="" method="post">
? ? ? ??? ??? ?第一个数：<input type="text" value="" name="first" size="25px"/>
? ? ? ??? ??? ?<br /><br />
? ? ? ??? ??? ?第二个数：<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 />
? ? ? ??? ??? ?<%
? ? ? ??? ??? ?
? ? ? ??? ??? ??? ??? ??? ?//获取表单中的数据进行运算
?? ??? ??? ??? ??? ??? ?String first = request.getParameter("first");//第一个数
?? ??? ??? ??? ??? ??? ?String second = request.getParameter("second");//第二个数
?? ??? ??? ??? ??? ??? ?String operator = request.getParameter("operator");//运算符
?? ??? ??? ??? ? ?? ??? ?String result = "" ;//运算结果
?? ??? ??? ??? ? ?? ??? ?
? ? ? ??? ??? ??? ??? ??? ?//判断运算符
? ? ? ??? ??? ??? ??? ??? ?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 = "除数不能为0";
? ? ? ??? ??? ??? ??? ??? ??? ?}else {
? ? ? ??? ??? ??? ??? ??? ??? ??? ?result = String.valueOf((double)(Integer.valueOf(first) / (double)Integer.valueOf(second) ));
? ? ? ??? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ??? ??? ??? ?
? ? ? ??? ??? ??? ??? ??? ?//定义一个计算器类
? ? ? ??? ??? ??? ??? ??? ?SimpleCalculator simpleCalculator = new SimpleCalculator();
? ? ? ??? ??? ??? ??? ??? ?simpleCalculator.setResult(result);
? ? ? ??? ??? ??? ??? ??? ?if( !simpleCalculator.getResult().equals("") && simpleCalculator.getResult() != null){
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("<h2 style= 'color: blue'>");
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("计算结果："+first+operator+second+" = "+simpleCalculator.getResult());
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("<h4>");
? ? ? ??? ??? ??? ??? ??? ?}else{
? ? ? ??? ??? ??? ??? ??? ??? ?out.print("计算错误");?
? ? ? ??? ??? ??? ??? ??? ?}
? ? ? ??? ??? ?
? ? ? ??? ??? ??? ??? ?%>
? ? ? ??? ??? ??? ??? ? ?<br /><br />
</body>
</html>

（2）SimpleCalculator类

public class SimpleCalculator {
?? ?
?? ?//定义变量
?? ?private String first;//第一个数
?? ?private String second;//第二个数
?? ?private String operator;//运算符
?? ?private String result;//运算结果
?? ?
?? ?//定义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;
?? ?}
?? ?
?? ?
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持 。