LApi is a Discord API written in Java

Achived: No further development.

In order to install it, you can either build it yourself or use gradle and implement it into your Project:

In your build.gradle add mavenCentral() to the repositories if you have not done so already and add the following two dependencies. Replace [version] with the version you want to install.

repositories {
    mavenCentral()
}

dependencies {
    annotationProcessor 'io.github.lni-dev:lapi-annotation-processor:1.0.1'
    implementation 'io.github.lni-dev:lapi:[version]'
}

An example build.gradle could look like this:

plugins {
    id 'java'
}

group 'com.example'
version 'your.version'

repositories {
    mavenCentral()
}

dependencies {
    annotationProcessor 'io.github.lni-dev:lapi-annotation-processor:1.0.1'
    implementation 'io.github.lni-dev:lapi:1.0.4'
}

(Tested on gradle 7.5.1)

If you want to make an executable .jar file at some point in time, I recommend the gradle plugins application and shadow. An example build.gradle with these plugins could look like this:

plugins {
    id 'java'
    id 'application'
    id 'com.github.johnrengelman.shadow' version '7.1.2'
}

group 'com.example'
version '1.0.0'
mainClassName = 'com.example.exampleProjectName.Main'

repositories {
    mavenCentral()
}

dependencies {
    annotationProcessor 'io.github.lni-dev:lapi-annotation-processor:1.0.1'
    implementation 'io.github.lni-dev:lapi:1.0.4'
}

This will then add a gradle task called shadowJar, which will build an executable jar for you.

First you will need to create a Discord bot and copy it's TOKEN.
Then you can create a Config:

Config config = ConfigBuilder.getDefault("TOKEN", true).build();

And create a LApi instance:

Config config = ConfigBuilder.getDefault("TOKEN", true).build();
LApi lApi = LApi.newInstance(config);

Or a lot simpler:

LApi lApi = ConfigBuilder.getDefault("TOKEN", true).buildLApi();

TOKEN must be replaced with your bot token. The second boolean parameter specifies, whether you want the privileged intents enabled. Read more here. If you pass true, you have to enable them for your application's bot here.

Now you can register an EventListener:

lApi.getEventTransmitter().addListener(new EventListener() {
    @Override
    public void onMessageCreate(@NotNull LApi lApi, @NotNull MessageCreateEvent event) {
        //code
    }

    @Override
    public void onMessageUpdate(@NotNull LApi lApi, @NotNull MessageUpdateEvent event) {
        //code
    }

    @Override
    public void onMessageDelete(@NotNull LApi lApi, @NotNull MessageDeleteEvent event) {
        //code
    }
});

Inside your listener, you can overwrite all events, you want to listen to.
Here a small example on how to respond to "Hi":

lApi.getEventTransmitter().addListener(new EventListener() {
    @Override
    public void onMessageCreate(@NotNull LApi lApi, @NotNull MessageCreateEvent event) {
        System.out.println("Message: " + event.getMessage().getContent());

        if(!event.getMessage().getAuthor().isBot() && event.getMessage().getContent().equals("Hi")){
            lApi.getRequestFactory().createMessage(event.getChannelId(), "Hi").queue();
        }
    }
});

Note the check, if the message was sent by a bot. This check is important, so that your bot does not respond to itself.