闰年条件：
- 能被4整除但不能被100整除
- 能被400整除
<%@ page language="java" import="java.util.*" contentType="text/html;charset=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>判断闰年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">
<%!
int getNumForYear(int byear,int eyear){
int num=0;//闰年数量
for(int i=byear;i<=eyear;i++){
//能被4整除但不能被100整除；能被400整除
if((i%4==0&&i%100!=0)||i%400==0){
num++;
}
}
return num;
}
%>
head>
<body>
<%=getNumForYear(2000,2018) %>
body>
html>
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