Como usar vários bancos de dados mongodb no aplicativo de inicialização de mola?

1. 
   Defina suas propriedades primárias e secundárias do mongodb como abaixo em application.properties, substitua por elas seus detalhes de banco de dados:
   

   ######Primary Mongo DB########################
   spring.data.mongodb.host=localhost
   spring.data.mongodb.database=primary
   spring.data.mongodb.port=27017
   spring.data.mongodb.password=*******
   spring.data.mongodb.username=*******
   
   ###########Secondary MongoDB#####################
   mongodb.host=localhost
   mongodb.port=27017
   mongodb.database=secondary
   mongodb.username=******
   mongodb.password=******
   

2. 
   Agora adicione Configuração Múltipla do Mongo Db.
   

   @Configuration
   public class MultipleMongoConfig {
   
   @Primary
   @Bean(name = "primary")
   @ConfigurationProperties(prefix = "spring.data.mongodb")
   public MongoProperties getPrimary() {
       return new MongoProperties();
   }
   
   @Bean(name = "secondary")
   @ConfigurationProperties(prefix = "mongodb")
   public MongoProperties getSecondary() {
       return new MongoProperties();
   }
   
   @Primary
   @Bean(name = "primaryMongoTemplate")
   public MongoTemplate primaryMongoTemplate() throws Exception {
       return new MongoTemplate(primaryFactory(getPrimary()));
   }
   
   @Bean(name = "secondaryMongoTemplate")
   public MongoTemplate secondaryMongoTemplate() throws Exception {
       return new MongoTemplate(secondaryFactory(getSecondary()));
   }
   
   @Bean
   @Primary
   public MongoDbFactory primaryFactory(final MongoProperties mongo) throws Exception {
       return new SimpleMongoDbFactory(new MongoClient(mongo.getHost(), mongo.getPort()),
               mongo.getDatabase());
   }
   
   @Bean
   public MongoDbFactory secondaryFactory(final MongoProperties mongo) throws Exception {
       return new SimpleMongoDbFactory(new MongoClient(mongo.getHost(), mongo.getPort()),
               mongo.getDatabase());
   }
   

   
   }
   
3. 
   Agora ative EnableMongoRepositories para seu primário e secundário. certifique-se de alterar basePackages = "com.example.springbootmultipledatasource.primary.repository" seu pacote de repositório aqui
   

   @Configuration
   @EnableMongoRepositories(basePackages = 
   "com.example.springbootmultipledatasource.primary.repository",
       mongoTemplateRef = "primaryMongoTemplate")
    public class PrimaryMongoConfig {
   
    }
   

    @Configuration
    @EnableMongoRepositories(basePackages = "com.example.springbootmultipledatasource.secondary.repository",
        mongoTemplateRef = "secondaryMongoTemplate")
   public class SecondaryMongoConfig {
   }