This sample JSP code can be used for monitoring any Simple Web Applications or Websites in your internal network as well as over internet. Just create save it with a .jsp extension (For Example index.jsp) & deploy onto a Tomcat or any other J2EE server.
Following is the sample JSP code to Monitor Website URLs. I have tested it & it works fine. In the following code you need to replace the value of variable “monitor1” with your Domain name or Application URL
<%@page import="java.net.ConnectException"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.net.HttpURLConnection" %>
<%@ page import="java.net.URL" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.net.HttpURLConnection" %>
<%@ page import="java.net.URL" %>
<%@ page import="java.net.Authenticator" %>
<%@ page import="java.net.PasswordAuthentication" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.text.SimpleDateFormat" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="refresh" content="120">
<title>URL Monitor</title>
</head>
<body>
<%
String monitor1="http://www.serverliving.com/";
HttpURLConnection rmonitor1 = ( HttpURLConnection ) new URL( monitor1 ).openConnection();
String bg="";
SimpleDateFormat time_formatter = new SimpleDateFormat("dd-MM-yyyy::HH:mm");
String current_time_str = time_formatter.format(System.currentTimeMillis());
out.print("<center/><h3>Current Time: "+current_time_str+"</h3>");
out.print("<table align=center border=1>");
out.print("<tr><th>APPLICATION</th><th>URL</th><th>STATUS</th></tr>");
try{
out.print("<tr><td>My Application Name</td>");
out.print("<td>"+monitor1+"</td>");
if(rmonitor1.getResponseCode() == 200){bg="#66ccff";}else{bg="#ff6600";}
out.print("<td bgcolor="+bg+">"+rmonitor1.getResponseCode()+"</td></tr>");
} catch (Exception e) {
out.print("<td bgcolor=#ff6600>Connection Failed</td>");
}
%>
</body>
</html>
If your monitoring server requires proxy authentication, you can simply add following code for Proxy Authentication
System.getProperties().put("http.proxyHost", "proxyHost.com");
System.getProperties().put("http.proxyPort", "9090");
System.setProperty("https.proxyUser", "Proxy_username");
System.setProperty("https.proxyPassword", "Proxy_password");
Authenticator.setDefault(new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
if (getRequestorType() == RequestorType.PROXY) {
String prot = getRequestingProtocol().toLowerCase();
String host = System.getProperty(prot + ".proxyHost", "");
String port = System.getProperty(prot + ".proxyPort", "80");
String user = System.getProperty(prot + ".proxyUser", "");
String password = System.getProperty(prot + ".proxyPassword", "");
if (getRequestingHost().equalsIgnoreCase(host)) {
if (Integer.parseInt(port) == getRequestingPort()) {
return new PasswordAuthentication(user, password.toCharArray());
}
}
}
return null;
}
});
Any suggestions or improvments to this code are welcome.
Server Living 