spring常用注解

Spring注解

依赖文件

<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:context="http://www.springframework.org/schema/context"
      xmlns:c="http://www.springframework.org/schema/c"
      xmlns:p="http://www.springframework.org/schema/p"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
       https://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

常用注解

• @Autowired @Qualifier(value = “cat2”)
• @Resource(这两个是自动导入的注解)
• @Nullable(字段标记可以为null)
• @Component(意思是组件，相当于XML配置中的Bean)
• @Component的三个衍生注解
  1.@Controller(用在Controller中)
  2.@Repository(用在Dao中)
  3.@Service(用在Service中)
• @Value(“山西省”)(用于给变量赋值)
• @Configuration(相当于Beans.xml)
• @Bean(相当于Beans.xml中配置Bean的语句)
• @ComponentScan(“com.wxs.pojo”)(给Beans配置扫描的包)
• @Import(WXSConfig2.class)(导入其他配置文件)