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
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<%@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
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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腳本之家。
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