A Method to Implement a Simple Calculator Based on JSP
- 2021-06-29 11:45:05
- OfStack
An example of how to implement a simple calculator based on JSP is given.Share it for your reference.The implementation is as follows:
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
<head>
<!-- User Submit Authentication -->
<script type="text/javascript" language="javascript">
<!--
function checkNum(){
if(form1.num1.value==""){
window.alert("num1 Value cannot be empty !!Ha-ha ");
return false;
}
// judge num1 Right? 1 Number
if(Math.round(form1.num1.value)!=(form1.num1.value)){
window.alert("num1 No 1 Integers ")
return false;
}
if(form1.num2.value==""){
window.alert("num2 Value cannot be empty !!Ha-ha ");
return false;
}
// judge num2 Right? 1 Number
if(Math.round(form1.num2.value)!=(form1.num2.value)){
window.alert("num2 No 1 Integers ")
return false;
}
}
-->
</script>
</head>
<h1> My Calculator </h1>
<hr>
<body>
<form name ="form1" action="result.jsp" method ="post">
<input type="text" name ="num1" ></input><br>
<select name="flag">
<option value=+>+</option>
<option value=->-</option>
<option value=*>*</option>
<option value=/>/</option>
</select><br>
<input type="text" name="num2"/></input><br>
<input type="submit" value=" Submit " onclick="return checkNum();"></input>
</form>
<hr>
</body>
</html>
result.jsp is used to display results
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
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>
</head>
<body>
<%
String num1=request.getParameter("num1");
String num2 = request.getParameter("num2");
String flag = request.getParameter("flag");
int s_num1=Integer.parseInt(num1);
int s_num2=Integer.parseInt(num2);
int result=0;
if(flag.equals("+")){
// plus
result=s_num1+s_num2;
}else if(flag.equals("-")){
// reduce
result=s_num1-s_num2;
}else if(flag.equals("/")){
result=s_num1/s_num2;
// except
}else{
// ride
result=s_num1*s_num2;
}
out.println(" The result is: "+result);
%>
</body>
</html>I hope that the description in this paper will be helpful to everyone's jsp program design.