问连接到多个MongoDB DataBases Java

EN

public static MongoDatabase dbConnect() {
       System.setProperty("javax.net.ssl.keyStore", "src/main/resources/firstDB.pkcs12");
       System.setProperty("javax.net.ssl.keyStorePassword", "qwerty");
       ConnectionString connectionString = new ConnectionString(System.getenv("FirstMongoDB_DEV"));
       CodecRegistry pojoCodecRegistry = fromProviders(PojoCodecProvider.builder().automatic(true).build());
       CodecRegistry codecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(),
               pojoCodecRegistry);

       MongoClientSettings clientSettings = MongoClientSettings.builder()
               .applyConnectionString(connectionString)
               .codecRegistry(codecRegistry)
               .build();
       return MongoClients.create(clientSettings).getDatabase("firstDB");

   }