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  • JSP小实例--计算器

    package cn.com.caculate;
    
    import java.math.BigDecimal;
    
    public class caculate {
    	private String firstNum="0";
    	private String secondNum="0";
    	private char operator='+';
    	private String result="0";
    	public String getFirstNum() {
    		return firstNum;
    	}
    	public void setFirstNum(String firstNum) {
    		this.firstNum = firstNum;
    	}
    	public String getSecondNum() {
    		return secondNum;
    	}
    	public void setSecondNum(String secondNum) {
    		this.secondNum = secondNum;
    	}
    	
    	public char getOperator() {
    		return operator;
    	}
    	public void setOperator(char operator) {
    		this.operator = operator;
    	}
    	public String getResult() {
    		return result;
    	}
    	public void setResult(String result) {
    		this.result = result;
    	}
    	public void calculate()
    	{
    		BigDecimal first=new BigDecimal(this.firstNum);
    		BigDecimal second=new BigDecimal(this.secondNum);
    		switch(this.operator)
    		{
    		case '+':
    			this.result=first.add(second).toString();
    			break;
    		case '-':
    			this.result=first.subtract(second).toString();
    		
    			break;
    		case '*':
    			this.result=first.multiply(second).toString();
    			break;
    		case '/':
    			if(second.doubleValue()==0)
    			{
    				throw new RuntimeException("除零异常!");
    			}
    			this.result=first.divide(second, 20, BigDecimal.ROUND_HALF_UP).toString();
    			break;
    		default:
    			throw new RuntimeException("操作有错误!");
    		}
    	}
    }
    <%@ 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 'calculator.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">
    	<!--
    	<link rel="stylesheet" type="text/css" href="styles.css">
    	-->
    
      </head>
      
      <body style="text-align:center;">
      <jsp:useBean id="caculate" class="cn.com.caculate.caculate"></jsp:useBean>
      <jsp:setProperty name="caculate" property="*"/>
      <%
      try{
      	caculate.calculate();
       	}
       catch(Exception e){
       	
       	out.write(e.getMessage());
       }
       %>
       <br/>-----------------------------------------------------<br/>
       	计算结果是:
       <jsp:getProperty name="caculate" property="firstNum"/>
       <jsp:getProperty name="caculate" property="operator"/>
       <jsp:getProperty name="caculate" property="secondNum"/>
       =
       <jsp:getProperty name="caculate" property="result"/>
       <br/>-----------------------------------------------------<br/>
      <form action="calculator.jsp" method="post">
      	<table width="404" border="1">
      		<tr>
      			<td colspan="3">简单的计算器</td>
      		</tr>
      		<tr>
      			<td>第一个数</td>
      			<td>
      				<input type="text" name="firstNum"/>
      			</td>
      		</tr>
      		<tr>
      			<td>选择操纵</td>
      			<td>
    	  			<select name="operator">
    	  				<option value='+'>+</option>
    	  				<option value='-'>-</option>
    	  				<option value='*'>*</option>
    	  				<option value='/'>/</option>
    	  			</select>
      			</td>
      		</tr>
      		<tr>
      			<td>第二个数</td>
      			<td>
      				<input type="text" name="secondNum"/>
      				
      			</td>
      		</tr>
      		<tr>
      			<td colspan="3">
      				<input type="submit" value="计算"/>
      			</td>
      		</tr>
      	</table>
        </form>	
      </body>
    </html>
    


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  • 原文地址:https://www.cnblogs.com/suncoolcat/p/3343534.html
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