Java WebSockets

https://github.com/TooTallNate/Java-WebSocket
Java WebSockets
This repository contains a barebones WebSocket server and client implementation written in 100% Java. The underlying classes are implemented  java.nio , which allows for a non-blocking event-driven model (similar to the WebSocket API for web browsers).
Implemented WebSocket protocol versions are:

RFC 6455

Hybi 17

Hybi 10

Hixie 76

Hixie 75

Here some more details about protocol versions/drafts.
Build
You can build using Ant or Maven but there is nothing against just putting the source path  src/main/java  on your applications buildpath.
Ant

ant 

will create the javadoc of this library at  doc/  and build the library itself:  dest/java_websocket.jar
The ant targets are:  compile ,  jar ,  doc  and  clean
Maven
To use maven just add this dependency to your pom.xml:

<dependency>
    <groupId>org.java-websocket</groupId> <artifactId>Java-WebSocket</artifactId> <version>1.3.0</version> </dependency> 

Running the Examples
Note: If you're on Windows, then replace the  :  (colon) in the classpath in the commands below with a  ;  (semicolon).
After you build the library you can start the chat server (a  WebSocketServer  subclass):

java -cp build/examples:dist/java_websocket.jar ChatServer

Now that the server is started, you need to connect some clients. Run the Java chat client (a  WebSocketClient  subclass):

java -cp build/examples:dist/java_websocket.jar ChatClient

The chat client is a simple Swing GUI application that allows you to send messages to all other connected clients, and receive messages from others in a text box.
In the example folder is also a simple HTML file chat client  chat.html , which can be opened by any browser. If the browser natively supports the WebSocket API, then it's implementation will be used, otherwise it will fall back to a Flash-based WebSocket Implementation.
Writing your own WebSocket Server
The  org.java_websocket.server.WebSocketServer  abstract class implements the server-side of the WebSocket Protocol. A WebSocket server by itself doesn't do anything except establish socket connections though HTTP. After that it's up to yoursubclass to add purpose.
Writing your own WebSocket Client
The  org.java_websocket.client.WebSocketClient  abstract class can connect to valid WebSocket servers. The constructor expects a valid  ws://  URI to connect to. Important events  onOpen ,  onClose ,  onMessage  and  onIOError  get fired throughout the life of the WebSocketClient, and must be implemented in your subclass.
WSS Support
This library supports wss. To see how to use wss please take a look at the examples.
If you do not have a valid certificate in place then you will have to create a self signed one. Browsers will simply refuse the connection in case of a bad certificate and will not ask the user to accept it. So the first step will be to make a browser to accept your self signed certificate. ( https://bugzilla.mozilla.org/show_bug.cgi?id=594502 ).If the websocket server url is  wss://localhost:8000  visit the url  https://localhost:8000  with your browser. The browser will recognize the handshake and allow you to accept the certificate. This technique is also demonstrated in this video.
The vm option  -Djavax.net.debug=all  can help to find out if there is a problem with the certificate.
It is currently not possible to accept ws and wss connections at the same time via the same websocket server instance.
For some reason firefox does not allow multible connections to the same wss server if the server uses a different port than the default port(443).
If you want to use  wss  on the android platfrom you should take a look at this.
I ( @Davidiusdadi ) would be glad if you would give some feedback whether wss is working fine for you or not.
Minimum Required JDK Java-WebSocket  is known to work with:

Java 1.5 (aka SE 6)

Android 1.6 (API 4)

Other JRE implementations may work as well, but haven't been tested.
Testing in Android Emulator
Please note Android Emulator has issues using  IPv6 addresses . Executing any socket related code (like this library) inside it will address an error

java.net.SocketException: Bad address family

You have to manually disable  IPv6  by calling

java.lang.System.setProperty("java.net.preferIPv6Addresses", "false"); java.lang.System.setProperty("java.net.preferIPv4Stack", "true");

somewhere in your project, before instantiating the  WebSocketClient  class. You can check if you are currently testing in the Android Emulator like this

if ("google_sdk".equals( Build.PRODUCT )) { // ... disable IPv6 }

Getting Support
If you are looking for help using  Java-WebSocket  you might want to check out the #java-websocket IRC room on the FreeNode IRC network.
License
Everything found in this repo is licensed under an MIT license. See the  LICENSE  file for specifics.