Socket.IO-Client for Java

socket.io-java-client is an easy to use implementation of socket.io for Java.

It uses Weberknecht as transport backend, but it's easy to write your own transport. See description below. An XHR-Transport is included, too. But it's not functional in its current state.

The API is inspired by java-socket.io.client.

Features:

transparent reconnecting - The API cares about re-establishing the connection to the server when the transport is interrupted.
easy to use API - implement an interface, instantiate a class - you're done.
output buffer - send data while the transport is still connecting. No problem, socket.io-java-client handles that.
meaningful exceptions - If something goes wrong, SocketIO tries to throw meaningful exceptions with hints for fixing.

Status: Connecting with Websocket is production ready. XHR is in beta.

How to use

Using socket.io-java-client is quite simple. But lets see:

Checkout and compile the project:

git clone git://github.com/Gottox/socket.io-java-client.git
cd socket.io-java-client
ant jar
mv jar/socketio.jar /path/to/your/libs/project

If you're using ant, change your build.xml to include socketio.jar. If you're eclipse, add the jar to your project buildpath.

Afterwards, you'll be able to use this library:

		SocketIO socket = new SocketIO("http://127.0.0.1:3001/");
		socket.connect(new IOCallback() {
			@Override
			public void onMessage(JSONObject json, IOAcknowledge ack) {
				try {
					System.out.println("Server said:" + json.toString(2));
				} catch (JSONException e) {
					e.printStackTrace();
				}
			}

			@Override
			public void onMessage(String data, IOAcknowledge ack) {
				System.out.println("Server said: " + data);
			}

			@Override
			public void onError(SocketIOException socketIOException) {
				System.out.println("an Error occured");
				socketIOException.printStackTrace();
			}

			@Override
			public void onDisconnect() {
				System.out.println("Connection terminated.");
			}

			@Override
			public void onConnect() {
				System.out.println("Connection established");
			}

			@Override
			public void on(String event, IOAcknowledge ack, Object... args) {
				System.out.println("Server triggered event '" + event + "'");
			}
		});
		
		// This line is cached until the connection is establisched.
		socket.send("Hello Server!");

For further informations, read the Javadoc.

Checkout

with git

 git clone git://github.com/Gottox/socket.io-java-client.git

with mercurial

 hg clone https://bitbucket.org/Gottox/socket.io-java-client

Both repositories are synchronized and up to date.

Building

to build a jar-file:

cd $PATH_TO_SOCKETIO_JAVA
ant jar
ls jar/socketio.jar

You'll find the socket.io-jar in jar/socketio.jar

Bugs

Please report any bugs feature requests to the Github issue tracker

Frameworks

This Library was designed with portability in mind.

Android is fully supported.
JRE is fully supported.
GWT does not work at the moment, but a port would be possible.
Java ME does not work at the moment, but a port would be possible.
... is there anything else out there?

Testing

There comes a JUnit test suite with socket.io-java-client. Currently it's tested with Eclipse.

You need node installed in PATH.

open the project with eclipse
open tests/io.socket/AllTests.java
run it as JUnit4 test.

TODO

Socket.io needs more unit-tests.
XhrTransport needs to pass all tests.
If websockets are failing (due to proxy servers e.g.), use XHR automaticly instead.

License - the boring stuff...

This library is distributed under MIT Licence.

Sounds so interesting...

You'll find further documentation at the Socket.io-java-client Github Wiki

refaelos/socket.io-java-client