%@ 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 'myCal.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"> 
 
 
!-- jsp页面中不可以直接使用script --> 
script language="javascript"> 
!-- 
  //写一个函数判断是否两个数都有 
  function checkNum() 
  { 
   //判断num1 num2是否为空 
   if((form1.num1.value == "") || (form1.num2.value == "")) 
   { 
    window.alert("null,不能为空！"); 
    return false; 
   } 
   //判断是否是数字 
   if(Math.round(form1.num1.value) != form1.num1.value  Math.round(form1.num2.value) != form1.num2.value) 
   { 
    window.alert("num1和num2不是一个数"); 
    return false; 
   } 
   if(Math.round(form1.num1.value) != form1.num1.value) 
   { 
    window.alert("num1不是一个数"); 
    return false; 
   } 
   if(Math.round(form1.num2.value) != form1.num2.value) 
   { 
    window.alert("num2不是一个数"); 
    return false; 
   } 
    
  } 
  
 --> 
 /script> 
/head> 
body> 
 
 form name="form1" action="calculator/myResult.jsp" method="post"> 
  请输入第一个数：input type="text" name="num1"> 
  select name="flag"> 
   option value=+>+/option> 
   option value=->-/option> 
   option value=*>*/option> 
   option value=/>//option> 
  /select> 
  请输入第二个数：input type="text" name="num2"> 
  input type="submit" value="计算" onclick="return checkNum();"> 
 /form> 
 
/body> 
/html> 

%@ 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 'myResult.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> 
 % 
 //第1步接收到 第1个数 
 String s_num1 = request.getParameter("num1"); 
 //第2步接收到 第2个数 
 String s_num2 = request.getParameter("num2"); 
 //第3步接收到 运算符 
 String flag = request.getParameter("flag"); 
 //第4步 计算 
  
 int num1 = Integer.parseInt(s_num1); 
 int num2 = Integer.parseInt(s_num2); 
 int result = 0; 
 if(flag.equals("+")) 
 { 
  result = num1+num2; 
 } 
 else if(flag.equals("-")) 
 { 
  result = num1-num2; 
 } 
 else if(flag.equals("*")) 
 { 
  result = num1*num2; 
 } 
 else if(flag.equals("/")) 
 { 
  result = num1/num2; 
 } 
 //第5步 
 out.println("结果是:"+result); 
 %> 
  
 /body> 
/html>