Springboot中的@ConditionalOnBean注解详细解读

@Data
@AllArgsConstructor
public class Computer {

    public String name;

}

import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class BeanConfig {

//    @Bean(name = "notebookPC")
    public Computer computer1() {
        return new Computer("笔记本电脑");
    }

//    @ConditionalOnBean(Computer.class)
    @ConditionalOnMissingBean(Computer.class)
    @Bean("notebookPC")
    public Computer computer2() {
        return new Computer("备用电脑");
    }
}

public class ConditionOnBeanTest extends BaseTest implements ApplicationContextAware {

    @Test
    public void test1() {
        Map<String, Computer> beansOfType = ApplicationContext.getBeansOfType(Computer.class);

        System.out.println(JSON.toJSONString(beansOfType));

    }

    public ApplicationContext ApplicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.ApplicationContext = applicationContext;
    }
}