This is a simple porting of socket.io-java-client that allows us to use a maven repository and Google's json parser instead of org.json.JSONObject

In your pom.xml

<!-- in the 'repositories' section -->
<repository>
  <id>keytwo.net</id>
  <name>Keytwo.net Repository</name>
  <url>http://audiobox.keytwo.net</url>
</repository>

<!-- in the 'dependencies' section -->
<dependency>
  <groupId>io.socket</groupId>
  <artifactId>socket.io-client</artifactId>
  <version>0.2.1</version> <!-- the desidered version -->
</dependency>

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:

        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.

• Class SocketIO
• Interface IOCallback

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.
• JavaME untested.
• ... 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