[Java] springboot注册bean的三种方法

• @componentscan
  
• @bean
  
• @import
  

• @configuration：配置类
  
• @controller ：web控制器
  
• @repository ：数据仓库
  
• @service：业务逻辑
  

@component
public class emaillogserviceimpl implements emaillogservice {
 private static final logger logger = loggerfactory.getlogger(emaillogserviceimpl.class);
 
 @override
 public void send(string email, string message) {
  assert.notnull(email, "email must not be null!");
  logger.info("send email:{},message:{}", email, message);
 }
}

@configuration
public class logserviceconfig {
 
 /**
  * 扩展printlogservice行为，直接影响到logservice对象，因为logservice依赖于printlogservice.
  *
  * @return
  */
 @bean
 public printlogservice printlogservice() {
  return new printlogserviceimpl();
 }
 
 @bean
 public emaillogservice emaillogservice() {
  return new emaillogserviceimpl();
 }
 
 @bean
 public printlogservice consoleprintlogservice() {
  return new consoleprintlogservice();
 }
}

@import({ logservice.class,printservice.class })
public class registrybean {
 
}