Spring面试题：（五）Spring注解开发@Component,@Autowired,@Bean,@Configuration

旧城等待， 2024-02-18 09:15 57阅读 0赞

### Bean基本注解 ###

spring提供注解的版本  
![在这里插入图片描述][cedabb921944490ca341f4fd2530ca83.png]

### @Component注解替代bean标签 ###

![在这里插入图片描述][1da62a70cd5a46e8953cc94e5e50b333.png]  
bean其它属性的相关注解：

*  @scope 替代scope
 *  @lazy 替代lazy-init
 *  @PostConstruct 替代init-method
 *  @PreDestroy 替代destroy-method  
    ![在这里插入图片描述][3182d376d0de4dd6880e3222d8d831ad.png]  
    使用@Component注解的前提是开启注解扫描  
    ![在这里插入图片描述][7b1e3defab234aa4bc0dc24003c6f664.png]

### 衍生注解Repository,Service,Controller ###

*  @Repository
 *  @Service
 *  @Controller  
    ![在这里插入图片描述][c28afd7e209e4298887b4648b12c1925.png]

### Bean依赖注入注解@Autowired ###

Autowired先根据类型匹配，如果匹配到多个，则按照名次二次匹配  
![在这里插入图片描述][164f08fb944f48809ff4cba60aa78987.png]

### @Bean注解 ###

![在这里插入图片描述][eb222e672fc348209b4995ef5f7ebdf9.png]  
![在这里插入图片描述][b53b2e922b794e439e4508c8fc1263cc.png]

### 配置类@Configuration注解 ###

![在这里插入图片描述][83f00290daa14eabb7c815e515679d5f.png]  
![在这里插入图片描述][f357c92daa684c74b9d64663828b196e.png]

### 其它注解 ###

@Primary优先级  
![在这里插入图片描述][0750fca3947e42c4a9fc96115838ea85.png]  
@Profile设置环境  
![在这里插入图片描述][2b7a983415a443efb14f1e90fc6940b3.png]

[cedabb921944490ca341f4fd2530ca83.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/c68b63fbc5d14ca3bd094fe4f8a5647b.png
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[7b1e3defab234aa4bc0dc24003c6f664.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/b568de412ff44039ab6707609bb0c774.png
[c28afd7e209e4298887b4648b12c1925.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/2f1669e552864f0ead884b9ecd488295.png
[164f08fb944f48809ff4cba60aa78987.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/dde55060f9624354bb0fee72111d8831.png
[eb222e672fc348209b4995ef5f7ebdf9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/fce0cb9155674412ada151ae636298f1.png
[b53b2e922b794e439e4508c8fc1263cc.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/87a989ea3da84a8d9ae8356fb69b47c5.png
[83f00290daa14eabb7c815e515679d5f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/54afe204f6184035b361ec6030169981.png
[f357c92daa684c74b9d64663828b196e.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/a3952a5d93c44b7b94deff337fbcabc3.png
[0750fca3947e42c4a9fc96115838ea85.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/7633e2fcdef64b3580ae8bbcd63db60b.png
[2b7a983415a443efb14f1e90fc6940b3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/18/7fdd5e2e53754ec295d60de2f859b8a6.png