How to send push notifications from a Java Servlet for web application?

Question

In my application I have to show a notification on a particular action taken place?

I have to show logged in user a notification then.

One way to get notifications is to keep polling after certain time interval. that is pull notification. But this causes unnecessary hits to server.

How can I use push notifications from server? I am using Java Servlets and JSP with Tomcat.

Take a look at WebSockets: http://stackoverflow.com/questions/2190500/websockets-served-by-a-servlet-container — , Apr 15 '13 at 08:27
You can take a look at HTML5 SSE (http://www.w3schools.com/html/html5_serversentevents.asp ) Not sure if this will solve your problem. It's basically polling, but you don't need to do it. The browser does it. — varun1505, Apr 15 '13 at 08:28

score 8 · Answer 1 · edited May 23 '17 at 11:54

8

Nowadays a promising way of client-server communication is to use Websockets.

See What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet to see some other ways together with the Websockets and for an advantages of Websockets with an introduction see An Introduction To WebSockets

edited May 23 '17 at 11:54

Community

answered Apr 15 '13 at 08:30

suat

score 1 · Answer 2 · answered Apr 15 '13 at 08:30

1

You can use WebSockets for this purpose. There are multiple implementations available like jwebsocket.

answered Apr 15 '13 at 08:30

Bhushan Bhangale

score 1 · Answer 3 · answered Apr 15 '13 at 08:34

1

Take a look at the Comet model and Servlet 3.0 specification.

answered Apr 15 '13 at 08:34

user2256686

score 0 · Answer 4 · edited May 23 '17 at 10:31

0

You can try Servlet3.0 Async functionality.

Here is an Chat example which does push : Servlet 3.0 Async Example

edited May 23 '17 at 10:31

Community

answered Apr 15 '13 at 08:43

Ramesh PVK

4 Answers4