How can I do this? 

I already added a command, but I have no idea, how to add parameters to it. Like /give <Player> <ID> [Amount]

Here's my code for the command:

 

package de.minecraft.commands;

import java.util.List;

import net.minecraft.command.CommandBase;
import net.minecraft.command.ICommandSender;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.util.ChatComponentText;
import net.minecraft.util.ChatStyle;
import net.minecraft.util.IChatComponent;

public class SampleCommand extends CommandBase {

@Override
public String getCommandName() {
	// TODO Auto-generated method stub
	return "test";
}

@Override
public String getCommandUsage(ICommandSender var1) {
	// TODO Auto-generated method stub
	return "/test";
}

@Override
public void processCommand(ICommandSender sender, String[] var2) {
	//...

}

}

 

and in the main class:

 

@EventHandler
    public void serverLoad(FMLServerStartingEvent event)
    {
        MinecraftServer server = MinecraftServer.getServer();
        ICommandManager command = server.getCommandManager();
        ServerCommandManager manager = (ServerCommandManager) command;
        manager.registerCommand(new SampleCommand());
    }

 

Can anyone help? 

The var2 String array paramter in the processCommand method is the parameters you want.

You can investigate the parameter, and find the player and ID from it.