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JSP實現簡單網頁計算器
瀏覽：7日期：2022-06-07 17:54:09
本文實例為大家分享了JSP實現簡單網頁計算器的具體代碼，供大家參考，具體內容如下
一、構造一個簡單的計算器，能夠進行“+、—、*、/”運算
（1）編寫jsp頁面，用戶通過表單輸入兩個操作數和運算符，調用該頁面自身處理該表單，通過調用SimpleCalculator類的實例實現運算邏輯，并顯示運算結果。
（2）實現下邊的jsp網頁計算器：
二、代碼實現
（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>計算器</title></head><body>? ? ? ? ? ?? ? ? ?<form action="" method="post">? ? ? ??? ??? ?第一個數：<input type="text" value="" name="first" size="25px"/>? ? ? ??? ??? ?<br /><br />? ? ? ??? ??? ?第二個數：<input type="text" value="" name="second" size="25px"/>? ? ? ??? ??? ?<br /><br />? ? ? ??? ??? ? ? ? ? ??? ??? ?<input type="submit" value="+" name="operator" size="3"/> ? ? ? ? ??? ??? ?<input type="submit" value="-" name="operator" size="3"/> ? ? ? ??? ??? ?<input type="submit" value="*" name="operator" size="3"/> ? ? ? ? ??? ??? ?<input type="submit" value="/" name="operator" size="3"/> ? ?? ??? ??? ??? ? ?? ??? ??? ??? ?<input type="reset" value="清除"/>? ? ? ?</form>? ? ? ? <br /><br />? ? ? ??? ??? ?<%? ? ? ??? ??? ?? ? ? ??? ??? ??? ??? ??? ?//獲取表單中的數據進行運算?? ??? ??? ??? ??? ??? ?String first = request.getParameter("first");//第一個數?? ??? ??? ??? ??? ??? ?String second = request.getParameter("second");//第二個數?? ??? ??? ??? ??? ??? ?String operator = request.getParameter("operator");//運算符?? ??? ??? ??? ? ?? ??? ?String result = "" ;//運算結果?? ??? ??? ??? ? ?? ??? ?? ? ? ??? ??? ??? ??? ??? ?//判斷運算符? ? ? ??? ??? ??? ??? ??? ?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 = "除數不能為0";? ? ? ??? ??? ??? ??? ??? ??? ?}else {? ? ? ??? ??? ??? ??? ??? ??? ??? ?result = String.valueOf((double)(Integer.valueOf(first) / (double)Integer.valueOf(second) ));? ? ? ??? ??? ??? ??? ??? ??? ?}? ? ? ??? ??? ??? ??? ??? ?}? ? ? ??? ??? ??? ??? ??? ?? ? ? ??? ??? ??? ??? ??? ?//定義一個計算器類? ? ? ??? ??? ??? ??? ??? ?SimpleCalculator simpleCalculator = new SimpleCalculator();? ? ? ??? ??? ??? ??? ??? ?simpleCalculator.setResult(result);? ? ? ??? ??? ??? ??? ??? ?if( !simpleCalculator.getResult().equals("") && simpleCalculator.getResult() != null){? ? ? ??? ??? ??? ??? ??? ??? ?out.print("<h2 style= "color: blue">");? ? ? ??? ??? ??? ??? ??? ??? ?out.print("計算結果："+first+operator+second+" = "+simpleCalculator.getResult());? ? ? ??? ??? ??? ??? ??? ??? ?out.print("<h4>");? ? ? ??? ??? ??? ??? ??? ?}else{? ? ? ??? ??? ??? ??? ??? ??? ?out.print("計算錯誤");?? ? ? ??? ??? ??? ??? ??? ?}? ? ? ??? ??? ?? ? ? ??? ??? ??? ??? ?%>? ? ? ??? ??? ??? ??? ? ?<br /><br /></body></html>（2）SimpleCalculator類
public class SimpleCalculator {?? ??? ?//定義變量?? ?private String first;//第一個數?? ?private String second;//第二個數?? ?private String operator;//運算符?? ?private String result;//運算結果?? ??? ?//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;?? ?}?? ??? ?}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。
標簽：
JSP
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