Spring 注解版 学习笔记AnnotationConfigApplicationContext

Posted 2021-05-21 Adorable_Rocy

AnnotationConfigApplicationContext

• • • 1.传统XML配置类
    • 2.注解版Spring

1.传统XML配置类

Spring配置文件版–》传送门

2.注解版Spring

1. 和XML不同的是，所有的注册方式全部使用注解的方式开发，下面小编演示基本操作。

2. 创建一个测试实体类以及测试类。

   测试实体类（TestAnnotaionBean）

@AllArgsConstructor
@NoArgsConstructor
@Data
public class TestAnnotaionBean {
       private String msg;
}

配置类（ MainConfigura ）

@Configuration(proxyBeanMethods = false)
public class MainConfigura {
        @Bean
        public TestAnnotaionBean testBean(){
            return new TestAnnotaionBean("创建的msg测试Bean");
        }
}

3. 测试类完成注解配置测试

@Slf4j
public class AnnotationTest {
    @Test
    public void test1(){
        //获取AnnotationConfigApplicationContext上下文
        AnnotationConfigApplicationContext annotationConfigApplicationContext =
                new AnnotationConfigApplicationContext(MainConfigura.class);

        TestAnnotaionBean bean = annotationConfigApplicationContext.getBean(TestAnnotaionBean.class);
        log.info("实例bean为：{}",bean);
    }
}

4. log日志打印如下

14:47:56.755 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@2ef9b8bc
14:47:56.776 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
14:47:56.843 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
14:47:56.845 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
14:47:56.847 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
14:47:56.850 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
14:47:56.861 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'mainConfigura'
14:47:56.867 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'testBean'
14:47:56.907 [main] INFO fatcats.top.demo.test.AnnotationTest - 实例bean为：TestAnnotaionBean(msg=创建的msg测试Bean)

Process finished with exit code 0

简单纯注解配置完成