SergioArrighi / Discord4J

Java interface for the Discord API

# Discord4J [](https://drone.io/github.com/austinv11/Discord4J/latest) [](https://jitpack.io/#austinv11/Discord4j) [](https://discord.gg/0SBTUU1wZTU7PCok)

Java interface for the unofficial Discord API, written in Java 8. The API is also available in a few other languages.

For the latest dev builds, download it from my ci server.

Adding Discord4J as a dependency for a project

Given that @VERSION@ = the a version of Discord4J (this can either be a release version, the short commit hash or dev-SNAPSHOT).

With maven

In your pom.xml add:

...
<repositories>
  ...
  <repository> <!-- This repo fixes issues with transitive dependencies -->
    <id>jcenter</id>
    <url>http://jcenter.bintray.com</url>
  </repository>
  <repository>
    <id>jitpack.io</id>
    <url>https://jitpack.io</url>
  </repository>
</repositories>
...
<dependencies>
  ...
  <dependency>
    <groupId>com.github.austinv11</groupId>
    <artifactId>Discord4j</artifactId>
    <version>@VERSION@</version>
   <!-- <classifier>shaded</classifier> <!-- Include this line if you want a shaded jar (all the Discord4J dependencies bundled into one jar)-->
  </dependency>
</dependencies>
...

With Gradle

In your build.gradle add:

...
repositories {
  ...
  jcenter() //This prevents issues with transitive dependencies
  maven {
    url  "https://jitpack.io"
  }
}
...
dependencies {
  ...
  compile "com.github.austinv11:Discord4j:@VERSION@"
  //compile "com.github.austinv11:Discord4j:@VERSION@:shaded" //Use this line instead of the one above it if you want a shaded jar (all the Discord4J dependencies bundled into one jar)
}
...

So, how do I use this?

Tutorials/Resources

• The Discord4J Tutorial Series maintained by @Panda
• The Discord4J Read The Docs maintained by @TheFjong.
• A quick overview of the AudioPlayer by @oopsjpeg
• A Discord Bot quick start example maintined by @quantic
• A simple Discord4J module example by @Martacus

Starting with the API

The very first thing you need to do is obtain a "DiscordClient" object. This can be done by using the ClientBuilder. Example:

public class Example {

  public static IDiscordClient getClient(String token, boolean login) { //Returns an instance of the discord client
    ClientBuilder clientBuilder = new ClientBuilder(); //Creates the ClientBuilder instance
    clientBuilder.withToken(token); //Adds the login info to the builder
    if (login) {
      return clientBuilder.login(); //Creates the client instance and logs the client in
    } else {
      return clientBuilder.build(); //Creates the client instance but it doesn't log the client in yet, you would have to call client.login() yourself
    }
  }
}

Events

The Discord4J library is very event driven. Your bot can detect these events through the use of an event listener. There are two ways of creating an event listener:

1. Using IListener:

public class InterfaceListener implements IListener<ReadyEvent> { //The event type in IListener<> can be any class which extends Event
  
  @Override
  public void handle(ReadyEvent event) { //This is called when the ReadyEvent is dispatched
    doCoolStuff();
  }
}

2. Using the @EventSubscriber annotation:

public class AnnotationListener {
  
  @EventSubscriber
  public void onReadyEvent(ReadyEvent event) { //This method is called when the ReadyEvent is dispatched
    foo();
  }
  
  public void onMessageReceivedEvent(MessageReceivedEvent event) { //This method is NOT called because it doesn't have the @EventSubscriber annotation
    bar();
  }
}

Registering your listener:

public class Main {
  
  public static void main(String[] args) {
    IDiscordClient client = Example.getClient(args[0], args[1], true); //Gets the client object (from the first example)
    EventDispatcher dispatcher = client.getDispatcher(); //Gets the EventDispatcher instance for this client instance
    dispatcher.registerListener(new InterfaceListener()); //Registers the IListener example class from above
    dispatcher.registerListener(new AnnotationListener()); //Registers the @EventSubscriber example class from above
  }
}

Modules

Discord4J has an api for creating modular Discord Bots! See Martacus's sample repo for an example as to how it works.

More examples

See the examples directory.

Projects using Discord4J

• Official Discord4J Addons: A collection of official addons and modules for Discord4J (https://github.com/Discord4J-Addons)
• D4J/JDA Player by @DV8FromTheWorld: A full-featured audio player for Discord4J and JDA (https://github.com/DV8FromTheWorld/JDA-Player)
• Discordinator by @alpha;helix: A modularized command API (https://github.com/alphahelix00/Discordinator)
• Instructability by @Kaioru: A simple command API (https://github.com/Kaioru/Instructability)

Deprecation policy

Due to the nature of the discord api, any deprecations found in the api should not be expected to last past the current version. Meaning that if a method is deprecated on version 2.1.0, do not assume the method will be available in version 2.2.0.

Development

The Discord API is still in development. Functions may break at any time.
In such an event, please contact me or submit a pull request.

Pull requests

No one is perfect at programming and I am no exception. If you see something that can be improved, please read the contributing guildelines and feel free to submit a pull request!

Other info

More information can be found in the docs. You can contact me on the Discord API server in the #java_discord4j channel.