本文整理了Java中io.micronaut.context.env.Environment.scan()方法的一些代码示例，展示了Environment.scan()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Environment.scan()方法的具体详情如下：
包路径：io.micronaut.context.env.Environment
类名称：Environment
方法名：scan

Environment.scan介绍

[英]Scan the current environment for classes annotated with the given annotation. Use with care, repeated invocations should be avoided for performance reasons.
[中]扫描当前环境中使用给定注释注释的类。小心使用，出于性能原因，应避免重复调用。

代码示例

代码示例来源：origin: io.micronaut/micronaut-inject

private boolean matchesPresenceOfEntities(ConditionContext context, AnnotationValue<Requires> annotationValue) {
  if (annotationValue.contains("entities")) {
    Optional<AnnotationClassValue[]> classNames = annotationValue.get("entities", AnnotationClassValue[].class);
    if (classNames.isPresent()) {
      BeanContext beanContext = context.getBeanContext();
      if (beanContext instanceof ApplicationContext) {
        ApplicationContext applicationContext = (ApplicationContext) beanContext;
        final AnnotationClassValue[] classValues = classNames.get();
        for (AnnotationClassValue<?> classValue : classValues) {
          final Optional<? extends Class<?>> entityType = classValue.getType();
          if (!entityType.isPresent()) {
            context.fail("Annotation type [" + classValue.getName() + "] not present on classpath");
            return false;
          } else {
            Environment environment = applicationContext.getEnvironment();
            Class annotationType = entityType.get();
            if (!environment.scan(annotationType).findFirst().isPresent()) {
              context.fail("No entities found in packages [" + String.join(", ", environment.getPackages()) + "] for annotation: " + annotationType);
              return false;
            }
          }
        }
      }
    }
  }
  return true;
}

代码示例来源：origin: io.micronaut/inject

private boolean matchesPresenceOfEntities(ConditionContext context, AnnotationValue<Requires> annotationValue) {
  if (annotationValue.contains("entities")) {
    Optional<AnnotationClassValue[]> classNames = annotationValue.get("entities", AnnotationClassValue[].class);
    if (classNames.isPresent()) {
      BeanContext beanContext = context.getBeanContext();
      if (beanContext instanceof ApplicationContext) {
        ApplicationContext applicationContext = (ApplicationContext) beanContext;
        final AnnotationClassValue[] classValues = classNames.get();
        for (AnnotationClassValue<?> classValue : classValues) {
          final Optional<? extends Class<?>> entityType = classValue.getType();
          if (!entityType.isPresent()) {
            context.fail("Annotation type [" + classValue.getName() + "] not present on classpath");
            return false;
          } else {
            Environment environment = applicationContext.getEnvironment();
            Class annotationType = entityType.get();
            if (!environment.scan(annotationType).findFirst().isPresent()) {
              context.fail("No entities found in packages [" + String.join(", ", environment.getPackages()) + "] for annotation: " + annotationType);
              return false;
            }
          }
        }
      }
    }
  }
  return true;
}