如何在Spring boot REST应用程序中使用Firebase？

<dependency>
    <groupId>com.google.firebase</groupId>
    <artifactId>firebase-admin</artifactId>
    <version>8.0.0</version>
</dependency>

import com.google.auth.oauth2.GoogleCredentials;
import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;
import java.io.FileInputStream;
import java.io.IOException;

@Configuration
public class FirebaseConfig {

    @PostConstruct
    public void initialize() throws IOException {
        FileInputStream serviceAccount = new FileInputStream("path/to/serviceAccountKey.json");

        FirebaseOptions options = new FirebaseOptions.Builder()
                .setCredentials(GoogleCredentials.fromStream(serviceAccount))
                .setDatabaseUrl("https://your-project-id.firebaseio.com")
                .build();

        FirebaseApp.initializeApp(options);
    }
}

import com.google.firebase.FirebaseApp;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MyController {

    private final FirebaseApp firebaseApp;

    @Autowired
    public MyController(FirebaseApp firebaseApp) {
        this.firebaseApp = firebaseApp;
    }

    @GetMapping("/data")
    public String getData() {
        FirebaseDatabase database = FirebaseDatabase.getInstance(firebaseApp);
        DatabaseReference ref = database.getReference("data");

        // 从Firebase数据库中获取数据
        String data = ref.getValue(String.class);

        return data;
    }
}