JSP2

<!--Shavit Borisov-->
<!--22.1.15-->
<!--http://pastebin.com/j8dnqdnh-->

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%!
String getFormField(HttpServletRequest req, String par)
{
    if (req.getParameter(par) != null)
        return req.getParameter(par);
    else
        return "";
}
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
long rand = Math.round(Math.random()*100);
 if (getFormField(request, "bet") != "")
 {
     String msg;
     int bet = Integer.parseInt(getFormField(request, "bet"));
     if (Math.abs(rand - bet) < 20)
         msg = "good";
     else
         msg = "bad";
     out.println("<script>");
     out.println("alert('" + msg + "')");
     out.println("</script>");
 }
%>
Hello there !<br>
Current time is: <%= new java.util.Date()%><br><br>
<form action="#" method="get">
    <label>Server's Bet</label>
    <input type="number" name="rand" readonly="readonly" value=<%= rand %>><br><br>
    Enter your bet press 'send' to check how far it is from the server's bet.<br>
    <label>Your Bet</label>
    <input type="number" name="bet" id="bet" min="1" max="100" value=<%= getFormField(request, "bet") %>>
    <button name="send">send</button>
</form>
</body>
</html>