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1 概述
@Component：表名一个类会作为组件类，并告知spring要为这个类创建bean
@Bean：告知spring这个方法会返回一个对象，这个对象需要注册为Spring上下文中的bean，通常方法体包含了最终产生bean实例的逻辑
2 相同点与不同点
相同点：都是为spring注册bean对象
不同点：
1）作用对象不同：
@Component注解作用于类
@Bean作用于方法
2）使用方法不同：
@Component注解直接标注在类声明上即可
@Component public class OrderService { }
但是在spring中通常@Component注解通常要配合@ComponentScan注解实现注册的功能
@ComponentScan("指定@Component注解所在的包路径") public class AppConfig { }
@Bean需要在配置类中使用，即类上需要加上@Configuration注解，然后在配置类中使用一个方法定义bean是如何创建的
@Configuration public class AppConfig { @Bean public OrderService
orderService1(){ return new OrderService(); } }
3）实现不同
@Component注解通常是通过类路径扫描来自动侦测以及自动装配到spring容器中（使用Component注解定义要扫描的路径）
@Bean注解通常是在标有@Configuration注解的方法中定义产生的这个bean，默认情况下，它将使用方法的名称作为bean的id
4）灵活性不同
@Bean注解比@Component注解灵活，我们可以按需注册需要的bean，很多场景我们只能通过@Bean来注册bean，比如引入第三方库中农的类需要装配到spring容器中。
