如何在App Messaging中使用Firebase从Springboot发送通知？

<dependency>
    <groupId>com.google.firebase</groupId>
    <artifactId>firebase-admin</artifactId>
    <version>7.0.0</version>
</dependency>

import com.google.firebase.messaging.FirebaseMessaging;
import com.google.firebase.messaging.Message;
import com.google.firebase.messaging.Notification;

// 创建一个FirebaseMessaging实例
FirebaseMessaging messaging = FirebaseMessaging.getInstance();

// 创建一个通知对象
Notification notification = Notification.builder()
    .setTitle("通知标题")
    .setBody("通知内容")
    .build();

// 创建一个消息对象
Message message = Message.builder()
    .setNotification(notification)
    .setToken("设备的注册令牌")
    .build();

// 发送通知
String response = messaging.send(message);