使用java的Firebase admin sdk无法连接

Question

我试图使用firebase数据库创建一个java桌面RMI数据管理系统。我的第一步是使用管理SDK确认firebase的连接性。我完全按照指南中的步骤进行，没有得到任何进展。程序执行，但在我的firebase控制台中没有数据修改。

public class Main{

    public static class User2 {

        public String date_of_birth;
        public String full_name;
        public String nickname;

        public User2(String dateOfBirth, String fullName) {
            this.date_of_birth = dateOfBirth;
            this.full_name = fullName;
        }

        public User2(String dateOfBirth, String fullName, String nickname) {
            this.date_of_birth = dateOfBirth;
            this.full_name = fullName;
            this.nickname = nickname;
        }
    }

    public static void main(String[] args) {

        FileInputStream serviceAccount = null;
        try {

            serviceAccount = new FileInputStream("rathnapuralabs-firebase-adminsdk-okzic-f6313557b4.json");
        } catch (FileNotFoundException e) {

            e.printStackTrace();
        }

        FirebaseOptions options = null;
        try {

            options = new FirebaseOptions.Builder()
                    .setCredentials(GoogleCredentials.fromStream(serviceAccount))
                    .setDatabaseUrl("https://rathnapuralabs.firebaseio.com")
                    .build();
        } catch (IOException e) {

            e.printStackTrace();
        }
        FirebaseApp.initializeApp(options);

        DatabaseReference ref = FirebaseDatabase.getInstance()
                .getReference();

        DatabaseReference usersRef = ref.child("users2");

        Map<String, User2> users = new HashMap<>();
        users.put("alanisawesome", new User2("June 23, 1912", "Alan Turing"));
        users.put("gracehop", new User2("December 9, 1906", "Grace Hopper"));

        usersRef.setValueAsync(users);

        ref.addListenerForSingleValueEvent(new ValueEventListener() {
           @Override
           public void onDataChange(DataSnapshot dataSnapshot) {
               Object document = dataSnapshot.getValue();
               System.out.println(document);
           }

           @Override
           public void onCancelled(DatabaseError error) {
           }
    });
    }

https://github.com/bandarawaththa/testing-firebase-with-realtime-db.git

Answer 1

下面的代码适用于我：

try {
            FirebaseOptions options = new FirebaseOptions.Builder()
                    .setCredentials(GoogleCredentials
                                    .fromStream(new ClassPathResource("/firebase-authentication.json").getInputStream()))
                    .build();

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

        } catch (IOException e) {
            e.printStackTrace();
        }

“/firebase-authentication.json”位于resources文件夹中。