Spring mongoDB：如何用MongoClientFactoryBean配置mongoDB

Question

@Configuration
public class AppConfig {

  /*
   * Use the standard Mongo driver API to create a com.mongodb.Mongo instance.
   */
   public @Bean Mongo mongo() throws UnknownHostException {
       return new Mongo("localhost");
   }
}    

使用UnknownHostException checked异常污染代码。使用checked exception是不可取的，因为基于Java的bean元数据使用方法作为设置对象依赖关系的手段，这使得调用代码变得混乱。

所以Spring提议

@Configuration
public class AppConfig {

/*
 * Factory bean that creates the com.mongodb.Mongo instance
 */
 public @Bean MongoFactoryBean mongo() {
      MongoFactoryBean mongo = new MongoFactoryBean();
      mongo.setHost("localhost");
      return mongo;
 }
}

但不幸的是，自Spring-data-mongoDB1.7以来，MongoFactoryBean已被弃用，并被MongoClientFactoryBean所取代。

@Bean
public MongoClientFactoryBean mongoClientFactoryBean() {
    MongoClientFactoryBean factoryBean = new MongoClientFactoryBean();
    factoryBean.setHost("localhost");
    return factoryBean;
}

Answer 1

是的，它返回一个mongo:-（

但是当mongoClient扩展Mongo时，只要@autowire将bean作为Mongo就可以了

@Autowired
private Mongo mongo;

那就用吧

MongoOperations mongoOps = new MongoTemplate(mongo, "databaseName");