Spring注解Component使用

写个实体
//等价于  在xml配置   <bean id="dog" class="com.rzk.pojo.Dog"/>
@Component
public class Dog {

    private String name;

    public String getDog() {
        return name;
    }
    @Value("狗子")
    public void setDog(String dog) {
        this.name = dog;
    }

    public void shout(){
        System.out.println("狗叫");
    }

    @Override
    public String toString() {
        return "Dog{" +
                "name='" + name + '\'' +
                '}';
    }
}
可以通过setName加上value 也可以在字段名上注入value ，在get的话不能

<?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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd"
>
    <!--指定要扫描的包，这个包下的注解会生效-->
    <context:component-scan base-package="com.rzk.pojo"/>
    <!--开启注解支持-->
    <context:annotation-config/>
</beans>

 

    @Test
    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applocationContext.xml");
        Dog dog = context.getBean("dog", Dog.class);
        System.out.println(dog.getDog());
    }