Spring Boot conditional注解用法详解

@Component
@ConditionalOnProperty("com.example.condition")
public class A {
}

@RunWith(SpringRunner.class)
@SpringBootTest
@Import(MyBeanImport.class)
public class ConditionTest implements ApplicationContextAware {
 
  private ApplicationContext applicationContext;
 
 
  @Test
  public void testA() {
    System.out.println(applicationContext.getBean(A.class));
  }
 
 
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
  }
}

public class MyCondition implements Condition {
  @Override
  public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
    String[] properties = (String[]) metadata
        .getAnnotationAttributes("com.example.demo.condi.MyConditionAnnotation")
        .get("value");
    for(String property : properties){
      if(StringUtils.isEmpty(context.getEnvironment().getProperty(property))){
        return false;
      }
    }
    return true;
  }
}

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Conditional({MyCondition.class})
public @interface MyConditionAnnotation {
  String[] value() default {};
}

@Component
@MyConditionAnnotation({"com.example.condition1","com.example.condition2"})
public class AA {
}