Description: Get the IP address of a web page visitor and display the access time
Principle: Use the getRemoteAddr method of the JSP built-in object request to obtain the visitor's address; use SimpleDateFormat to convert the current time to the specified time format, and finally use the expression language for output
Code:
<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JSP</title>
</head>
<body>
<%
// get IP
String ip = request.getRemoteAddr();
// Get Time
String data = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(new Date());
%>
<%-- use expression language for output--%>
<h2>Your IP address is: <%=ip%></h2>
<h2>Time of this visit: <%=data%></h2>
</body>
</html>
Improvement: The obtained IP address can be saved to the database, otherwise the previous IP will disappear after each refresh