How to make a Discord Moderation bot in Java

Create a new project and add JDA as a dependency (again, if you don’t know how refer to the tutorial above)

Our build.gradle now looks like this:

Now, we’ll use JDA-Utilities’ CommandClient to handle our command processing.

This is what a basic command looks like:

All mod actions in JDA (such as banning, kicking, adding or removing roles, server muting, server deafening, etc) are done through the GuildController class.

To get the GuildController for a Guild, call it’s getController() method.

A RestAction represents a request that will be done. However, the request will be executed only when you call queue(), complete(), or submit() on the RestAction object. If you don't call one of those methods, the action will never be executed and your bot will not work.

For now, let’s make a kick command. It’ll be executed as !!kick @Person, where Person is who you want to kick. For this command, we'll use the Message#getMentionedMembers() and GuildController#kick methods.

This is what our kick command looks like:

The way to ban is almost equal to the way you kick, but there’s one additional argument you must give to the GuildController#ban() method, which is how far the banned person's messages will be deleted.

The implementation of this command is left as an exercise for you.

A softban is basically a ban and unban, to kick and delete an user’s messages. Let’s implement one now by modifying the ban command:

To mute, we’ll need a Mute role. For now, we’ll just give the person the first role named Muted we find:

Again, the actual command implementation is left as an exercise for the reader.

We’ll mute someone for 1 hour, then unmute. Let’s change our mute command:

To create our filter, we’ll need to add a new listener to our JDA object. Let’s create a new class and extend ListenerAdapter:

Now, let’s override the onGuildMessageReceived(GuildMessageReceivedEvent) method:

Let’s also add a curse word list:

Now, let’s see if there’s a curse word and delete the message if it has one:

If we run our bot now, we’ll notice it completely ignores curse words. That’s because we didn’t register the listener. Now let’s go back to our main class and change .addEventListener(commandClientBuilder.build()) to .addEventListener(commandClientBuilder.build(), new CurseWorldFilter()) so our listener is registered.

Run the bot again and you’ll notice it’s now detecting curse words and deleting them.

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