[{"createTime":1735734952000,"id":1,"img":"hwy_ms_500_252.jpeg","link":"https://activity.huaweicloud.com/cps.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=V1g3MDY4NTY=&utm_medium=cps&utm_campaign=201905","name":"华为云秒杀","status":9,"txt":"华为云38元秒杀","type":1,"updateTime":1735747411000,"userId":3},{"createTime":1736173885000,"id":2,"img":"txy_480_300.png","link":"https://cloud.tencent.com/act/cps/redirect?redirect=1077&cps_key=edb15096bfff75effaaa8c8bb66138bd&from=console","name":"腾讯云秒杀","status":9,"txt":"腾讯云限量秒杀","type":1,"updateTime":1736173885000,"userId":3},{"createTime":1736177492000,"id":3,"img":"aly_251_140.png","link":"https://www.aliyun.com/minisite/goods?userCode=pwp8kmv3","memo":"","name":"阿里云","status":9,"txt":"阿里云2折起","type":1,"updateTime":1736177492000,"userId":3},{"createTime":1735660800000,"id":4,"img":"vultr_560_300.png","link":"https://www.vultr.com/?ref=9603742-8H","name":"Vultr","status":9,"txt":"Vultr送$100","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":5,"img":"jdy_663_320.jpg","link":"https://3.cn/2ay1-e5t","name":"京东云","status":9,"txt":"京东云特惠专区","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":6,"img":"new_ads.png","link":"https://www.iodraw.com/ads","name":"发布广告","status":9,"txt":"发布广告","type":1,"updateTime":1735660800000,"userId":3},{"createTime":1735660800000,"id":7,"img":"yun_910_50.png","link":"https://activity.huaweicloud.com/discount_area_v5/index.html?fromacct=261f35b6-af54-4511-a2ca-910fa15905d1&utm_source=aXhpYW95YW5nOA===&utm_medium=cps&utm_campaign=201905","name":"底部","status":9,"txt":"高性能云服务器2折起","type":2,"updateTime":1735660800000,"userId":3}]
Spring往容器中注入组件四种方式:
1. 包扫描(@ComponentScan+@Controller,@Service,@Component,@Repository)
开发中经常使用。
2. 配置类 @Configuration + @Bean方式
一般用导入第三方的组件
3. 使用@Import[快速的给容器中导入组件]
1.使用@Import 导入组件,id是组件全类名
2. ImportSelector:返回需要导入ioc容器组件的全类名
3. ImportBeanDefinitionRegistrar:手动将组件添加到容器中
4. 使用Spring提供的FactoryBean (工厂Bean)
1.默认获取的FactoryBean.getObject()
2.如果需要获取当前类本身,需要在id前加一个& getBean("&FactoryBean")
Spring通过DI(依赖注入),完成对ioc容器中各个组件依赖关系赋值
1.@AutoWired自动注入:
默认优先按照类型去容器中查找对应的组件,applicationContext.getBean(Xxx.class);
如果找到多个相同类型的组件,则会再按当前属性的名称作为属性的id去容器中查找
applicationContext.getBean("xxxx");
可以结合@Qualifier("id"):使用@Qualifier指定需要装配的组件id,而不是根据属性名
自动装配一定要将属性赋值好,没有就会报错; @AutoWired(required = false) 避免报错
2.@Primary:让Spring进行自动装配的时候,默认使用首选的名字
3. Spring还支持使用@Resource(JSR250)和@Inject(JSR330)[java注解规范]
@Resource:可以和@AutoWired一样实现自动装配功能;默认是按照组件名称进行装配的;
但不支持@Primary功能,也没有@AutoWired(required = false);
@Inject: 需要导入javax.inject的包,和@AutoWired的功能一样.没有required=false的功能
@Autowired:是Spring定义的;@Resource和Inject是java规范
