【spring】之xml和Annotation，Bean注入的方式

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基于xml形式Bean注入

@Data

@AllArgsConstructor

@NoArgsConstructor

public class PersonBean {

    private Integer id;

    private String name;

    private String address;

}

<bean class="com.luna.annotation.PersonBean" id="personBean">

        <property name="name" value="张三"/>

        <property name="address" value="上海"/>

        <property name="id" value=""/>

    </bean>

 //基于xml完成数据Bean注入

    @Test

    public void test(){

        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");

        PersonBean personBean = (PersonBean) applicationContext.getBean("personBean");

        System.out.println(personBean.getAddress());

    }

基于Annotation形式Bean注入

@Configuration//告诉spring这是个配置类

public class PersonBeanConfig {

    @Bean(value = "person")//默认情况下使用方法名作为属性名

    public PersonBean personBean(){

        return new PersonBean(,"李四","北京");

    }

}

//基于纯注解完成数据注入

    @Test

    public void test(){

        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(PersonBeanConfig.class);

        PersonBean personBean = applicationContext.getBean(PersonBean.class);//类型

        System.out.println(personBean.getAddress());

        PersonBean person = (PersonBean)applicationContext.getBean("person");//属性名

        System.out.println(person.getAddress());

        String[] names= applicationContext.getBeanNamesForType(PersonBean.class);//查看在容器中当前Bean的属性名

        for(String name:names){

            System.out.println(name);

        }

    }