我正在尝试使用FCM从我的服务器发送Sping Boot 中生成的通知。我的客户是在Flutter上制作的。

@Service
public class ChatNotificationService implements IChatNotificationsService{
    @Override
    public void notify(User sender, User receiver) {
        Message msg = Message.builder()
                .setToken(receiver.getNotificationDeviceID())
                .putData("New message", "You have received a message from @" + sender.getUsername())
                .build();
        try{
            FirebaseMessaging.getInstance().send(msg);
        }catch (Exception e){
            //Handle exception...
        }

    }
}

问题是它显然工作正常。但是，消息永远不会到达设备。
消息构建无误，try块也正确执行。它返回预期的ID sush，
projects/myproject-b5ae1/messages/0：1500415314455276%31bd1c9631bd1c96
但设备不会收到任何通知。
我已经尝试使用Firebase Jmeter 板手动向相同的设备注册令牌发送消息，它在那里工作正常。设备按预期接收通知。

它也可以正常使用 Postman 直接

POST https://fcm.googleapis.com/v1/projects/myproject-b5ae1/messages:send HTTP/1.1

Content-Type: application/json
Authorization: Bearer ya29.ElqKBGN2Ri_Uz...HnS_uNreA

{
   "message":{
      "token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
      "notification":{
        "body":"This is an FCM notification message!",
        "title":"FCM Message"
      }
   }
}

这是我的配置类

@Configuration
public class FirebaseConfiguration {
    @Bean
    FirebaseMessaging firebaseMessaging(FirebaseApp firebaseApp) {
        return FirebaseMessaging.getInstance(firebaseApp);
    }
    @Bean
    FirebaseApp firebaseApp(GoogleCredentials credentials) {
        FirebaseOptions options = FirebaseOptions.builder()
                .setCredentials(credentials)
                .build();

        if(FirebaseApp.getApps().isEmpty()) { 
            return FirebaseApp.initializeApp(options);
        }else{
            return FirebaseApp.getInstance();
        }
    }

    @Bean
    GoogleCredentials googleCredentials() throws IOException {
       return GoogleCredentials.fromStream(new ClassPathResource("firebase-key.json").getInputStream());
    }

}

我试过的其他方法：

• 在仿真器和物理设备上测试
• 已打开防毒墙通知设置