java spring后端的firebase verifyidtoken

我有一个移动应用程序,使用谷歌标志,并试图验证令牌在后端(Java Spring)。 我已经为它设置了一些代码,下面是许多文章。

1. firebaseServiceCredential.java版本

这是用于firebase连接的,因为我正在使用 Admin SDK

    package com.nostratech.nostrafood.config;

    import com.google.auth.oauth2.GoogleCredentials;
    import com.google.firebase.FirebaseApp;
    import com.google.firebase.FirebaseOptions;
    import com.google.firebase.database.FirebaseDatabase;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.context.annotation.Configuration;

    import java.io.FileInputStream;
    import java.io.IOException;

    @Slf4j
    @Configuration
    public class FirebaseServiceCredential {
    public void firebaseConnect() throws IOException {
        try {
            FileInputStream serviceAccount = new FileInputStream("resources/charity-firebase-adminsdk-ymwjh-61467z75ba.json");

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

        FirebaseApp.initializeApp(options);
        FirebaseDatabase.getInstance(FirebaseApp.getInstance()).setPersistenceEnabled(true);

            } catch (Exception e) {
                log.debug("Trying to login to firebase failed. Reason: " + e.getMessage());
            }
        }
    }

2. GoGoSLigNeNoServices

这是 verifyIdToken

    package com.nostratech.nostrafood.service.base;

    import com.google.firebase.auth.FirebaseAuth;
    import com.google.firebase.auth.FirebaseAuthException;
    import com.google.firebase.auth.FirebaseToken;
    import org.springframework.stereotype.Service;

    @Service
    public class GoogleSignInService {

        public void verifyToken(String idToken) throws FirebaseAuthException {
            FirebaseToken decodedToken = 
            FirebaseAuth.getInstance().verifyIdToken(idToken);
            String uid = decodedToken.getUid();
        }
    }

下一步我该如何验证令牌?我读了很多文章,但还是不知道该怎么办。