Minecraft 1122 Forge 代码以安装该mod的玩家的身份发送消息就像正常按T输入消息发送一样

要在Minecraft 1.12.2 Forge中以安装该mod的玩家的身份发送消息，你可以使用下面的代码：

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.util.text.TextComponentString;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.event.FMLServerStartingEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.gameevent.PlayerEvent;

@Mod(modid = "examplemod", name = "Example Mod", version = "1.0")
public class ExampleMod {

    @Mod.EventHandler
    public void serverLoad(FMLServerStartingEvent event) {
        event.registerServerCommand(new SendMessageCommand());
    }

    public static class SendMessageCommand extends net.minecraft.command.CommandBase {

        @Override
        public String getName() {
            return "sendmessage";
        }

        @Override
        public String getUsage(net.minecraft.command.ICommandSender sender) {
            return "/sendmessage <message>";
        }

        @Override
        public void execute(net.minecraft.command.ICommandSender sender, String[] args) {
            if (sender instanceof EntityPlayer) {
                EntityPlayer player = (EntityPlayer) sender;
                String message = String.join(" ", args);

                player.sendMessage(new TextComponentString(message));
            }
        }
    }

    @Mod.EventBusSubscriber
    public static class EventHandler {

        @SubscribeEvent
        public static void onPlayerLoggedIn(PlayerEvent.PlayerLoggedInEvent event) {
            if (event.player instanceof EntityPlayer) {
                EntityPlayer player = (EntityPlayer) event.player;
                player.sendMessage(new TextComponentString("Welcome to the server!"));
            }
        }
    }
}

这个mod注册了一个名为"sendmessage"的命令，可以通过在游戏中输入"/sendmessage <message>"来发送消息。在玩家登录服务器时，也会发送一条欢迎消息给他们。

请注意，这只是一个简单的示例，你可以根据自己的需求进行修改和扩展。