代码20170308001：
<%@ 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 ‘MyJsp20170308001.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>
<form name="forml" method="post" action="002.jsp">
数字：
<label>
<input type="text" name="number" id="textfield"><br>
<input type="submit" name="button"id="button"value="提交">
</label>
</form>
</body>
</html>
代码002：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%String Num; %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP ‘MyJsp20170308002.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>
<% Num=request.getParameter("number"); %> <br>
<%
Integer.valueOf(Num);
%>
<%
if(Integer.valueOf(Num)>10){ %>
<%=+Integer.valueOf(Num)+">10" %>
<%
}else if(Integer.valueOf(Num)==10){ %>
<%=+Integer.valueOf(Num)+"=10" %>
<%}else if(Integer.valueOf(Num)<10){ %>
<%=+Integer.valueOf(Num)+"<10" %>
<%} %>
</body>
</html
原文：http://www.cnblogs.com/sushuiheng/p/6523225.html