Data.java:package top.yuyanmc.data;

import net.mamoe.mirai.console.data.Value;
import net.mamoe.mirai.console.data.java.JAutoSavePluginData;
import org.jetbrains.annotations.NotNull;

import java.util.HashMap;
import java.util.Map;

public class Data extends JAutoSavePluginData {
public static final Data INSTANCE = new Data("Misuka_data");
public final Value<Map<Long, Long>> signed = typedValue(createKType(Map.class, createKType(Long.class), createKType(Long.class)));
public final Value<Map<Long, Long>> point = typedValue(createKType(Map.class, createKType(Long.class), createKType(Long.class)));

public Data(@NotNull String saveName) {
    super(saveName);
}

}

Plugin.java:package top.yuyanmc;

import net.mamoe.mirai.console.data.Value;
import net.mamoe.mirai.console.plugin.jvm.JavaPlugin;
import net.mamoe.mirai.console.plugin.jvm.JvmPluginDescriptionBuilder;
import net.mamoe.mirai.event.GlobalEventChannel;
import net.mamoe.mirai.event.events.GroupMessageEvent;
import net.mamoe.mirai.message.data.*;
import top.yuyanmc.data.Data;

import java.util.Map;

public final class Plugin extends JavaPlugin {
public static final Plugin INSTANCE = new Plugin();

private Plugin() {
    super(new JvmPluginDescriptionBuilder("top.yuyanmc.plugin", "1.1-beta")
            .name("Misuka Server Plugin")
            .author("yuyanMC")
            .build());
}

@Override
public void onEnable() {
    this.reloadPluginData(Data.INSTANCE);
    getLogger().info("Plugin loaded!");
    GlobalEventChannel.INSTANCE.subscribeAlways(GroupMessageEvent.class, (GroupMessageEvent event) ->{
        if(event.getMessage().contentToString().contains("awa")) {
            event.getGroup().sendMessage("awa");
        }
        if(event.getMessage().contentEquals("签到",false)) {
            getLogger().info(event.getSender().getNick() + "signed.");
            Value<Map<Long, Long>> signed_warped = Data.INSTANCE.signed;
            Map<Long, Long> signed = signed_warped.get();
            if(signed.containsKey(event.getSender().getId()) && signed.get(event.getSender().getId())/86400000 >= System.currentTimeMillis()/86400000) {
                MessageContent messageContent;
                MessageContent messageContent2;
                messageContent = new At(event.getSender().getId());
                messageContent2 = new PlainText("你已经签到过了！");
                MessageChain messageChain = MessageUtils.newChain(messageContent, messageContent2);
                event.getGroup().sendMessage(messageChain);
            } else {
                MessageContent messageContent;
                MessageContent messageContent2;
                messageContent = new At(event.getSender().getId());
                signed.put(event.getSender().getId(), System.currentTimeMillis());
                Value<Map<Long, Long>> point_warped = Data.INSTANCE.point;
                Map<Long, Long> point = point_warped.get();
                if(point.containsKey(event.getSender().getId())){
                    point.put(event.getSender().getId(), point.get(event.getSender().getId())+10);
                }else{
                    point.put(event.getSender().getId(), 10L);
                }
                messageContent2 = new PlainText("签到成功！\n当前积分："+point.get(event.getSender().getId()).toString());
                point_warped.set(point);
                Data.INSTANCE.onValueChanged(point_warped);
                MessageChain messageChain = MessageUtils.newChain(messageContent, messageContent2);
                event.getGroup().sendMessage(messageChain);
            }
            signed_warped.set(signed);
            Data.INSTANCE.onValueChanged(signed_warped);
            savePluginData(Data.INSTANCE);
        }
    });
}

}

data文件里只有"{}"两个字符