<?xml version="1.0" encoding="UTF-8"?>
<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"
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">
<context:annotation-config/>
</beans>
<?xml version="1.0" encoding="UTF-8"?>
<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"
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">
<!--自动扫描com.shuai内部的对象-->
<context:component-scan base-package="com.shuai"/>
<context:annotation-config/>
</beans>
- @Component 自动创建对象、相当于xml配置中”
- 我们在web开发中、按照mvc三层架构分层
- [Controller] @Controller
- [dao] @Repository
- [Service] @Service
这四个注解都一样、都代表将某个类注册到Spring容器中。
- @Value("帅气") 给内部字段赋值 相当于xml配置中”“
- @Autowired 自动装配通过类型、名字。如果Autowired不能唯一自动装配上属性、则需要通过@Quqlifier(
value="
xxx")
- @Nullable 字段标记了这个注解说明此字段可以为空
- @Resource 自动装配先通过名字、在类型
- 如果无法使用Resource,那么可能是jdk版本太低或者太高的问题
- pom.xml导入以下配置 “javax.annotation-api-1.3.2.jar”
<!-- https://mvnrepository.com/artifact/javax.annotation/javax.annotation-api -->
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.3.2</version>
</dependency>