spring boot注解学习记

@Component

Compent等效于xml文件中的Bean标注，Autowired自动初始化Bean是通过查找Component注解实现的，在增加Component后还是Autowired找不到的情况，应该是在main类中没有增加ComponentScan注解。

@SpringBootApplication
@ComponentScan(basePackages = "com.xes.cloudlearn.requester.producter")
public class TestApplication {

    public static void main(String[] args){

        SpringApplication.run(TestApplication.class,args);

    }

}

@ConfigurationProperties 读取配置文件

ConfigurationProperties注解用于标注读取配置文件的节点，PropertySource用于标注文件，如果PropertySource不设置，默认读取application.properties或application.yml文件。

@Component("queueConfiguration")
@ConfigurationProperties(prefix = "requester.rocketmq", )
public class QueueConfiguration {

    private String rocketHost;

    public String getRocketHost() {
        return rocketHost;
    }

    public void setRocketHost(String rocketHost) {
        this.rocketHost = rocketHost;
    }

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    private String topic;

}

调用配置文件 

@Component("queueProducter")
public class QueueProducter {

    @Autowired
    QueueConfiguration queueConfiguration;

    public void SendQueue(){

        System.out.println(queueConfiguration.getRocketHost());

    }

}

 测试用例

@RunWith(SpringRunner.class)
@SpringBootTest(classes=TestApplication.class,
        webEnvironment = SpringBootTest.WebEnvironment.NONE)
public class QueueProducterTest {

    @Autowired
    QueueProducter queueProducter;

    @Test
    public void testQueue(){

        System.out.println(">>>>>>>>>>>>>> testing...");
        queueProducter.SendQueue();
    }
}