JSP网页计算器
一只小小的蚂蚁 人气:0一、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 /> <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 /> <% //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; } }
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