计算器jsp实现

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详情请看代码：

package cn.csdn.domain;

import java.math.BigDecimal;

public class Calculate {
	private Double firstNum;
	private char operator;
	private Double secondNum;
	private Double result;
	public Calculate() {
		super();
		// TODO Auto-generated constructor stub
	}
	public Double getFirstNum() {
		return firstNum;
	}
	public void setFirstNum(Double firstNum) {
		this.firstNum = firstNum;
	}
	public char getOperator() {
		return operator;
	}
	public void setOperator(char operator) {
		this.operator = operator;
	}
	public Double getSecondNum() {
		return secondNum;
	}
	public void setSecondNum(Double secondNum) {
		this.secondNum = secondNum;
	}
	public Double getResult() {
		return result;
	}
	public void setResult(Double result) {
		this.result = result;
	}
	 public Double calculate(){
		 switch(this.operator){
			 case '+':
				 this.result=this.firstNum+this.secondNum;
				 break;
			 case '-':
				 this.result=this.firstNum-this.secondNum;
				 break;
			 case '*':
				 this.result=this.firstNum*this.secondNum;
				 break;
			 case '/':
				 if(this.secondNum==0){
					 System.out.println("除数不能为零");
				 }else{
					 this.result=this.firstNum/this.secondNum;
					 BigDecimal bigDecimal=new BigDecimal(this.result);
					 bigDecimal=bigDecimal.setScale(2,BigDecimal.ROUND_HALF_UP);
					 this.result=bigDecimal.doubleValue();
				 }				 
				 break;
			default:
				 System.out.println("无法判断");
				 break;
		 }
		 return result;
	 }
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP '1.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">

</head>
  
  <body>
 	<div align="center">
	    <h1>计算器简单实现</h1>
	    <hr color="red">
	    <div>
	    
	    	<jsp:useBean id="calculate" class="cn.csdn.domain.Calculate" ></jsp:useBean>
	    	<jsp:setProperty property="*" name="calculate"/>
	    	<%
	    		calculate.calculate();
	    	 %>
	    	 计算结果是：
	    	 <jsp:getProperty property="firstNum" name="calculate"/>
	    	 <jsp:getProperty property="operator" name="calculate"/>
	    	 <jsp:getProperty property="secondNum" name="calculate"/>=
	    	 <jsp:getProperty property="result" name="calculate"/>
	    </div>
	    <form action="./1.jsp" method="post">
		    <table border="1px">
		    	<caption>计算器</caption>
		    	<tr>
		    		<td colspan="2"></td>
		    	</tr>
		    	<tr>
		    		<td>第一个参数：</td>
		    		<td><input type="text" name="firstNum"/></td>
		    	</tr>
		    	<tr>
		    		<td>运算符</td>
		    		<td>
		    			<select name="operator">
		    				<option selected>+</option>
		    				<option>-</option>
		    				<option>*</option>
		    				<option>/</option>
		    			</select>
		    		</td>
		    	</tr>
		    	<tr>
		    		<td>第二个参数：</td>
		    		<td><input type="text" name="secondNum"/></td>
		    	</tr>
		    	<tr>
		    		<td colspan="2">
		    			<input type="submit" value="计算"/>
		    		</td>
		    	</tr>
		    </table>
	    
	    </form>
 	</div> 
  </body>
</html>

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