Spring启动时，读取bean，将每个bean转化为BeanDefinition对象。BeanDefinition保存了一个bean的所有基本信息。
以下是一个BeanDefinition的主要属性：
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| public abstract class AbstractBeanDefinition extends BeanMetadataAttributeAccessor implements BeanDefinition, Cloneable {
private volatile Object beanClass; // 保存bean的class属性
private String scope = SCOPE_DEFAULT; // bean是否单例
private boolean abstractFlag = false; // 保存该bean是否抽象
private boolean lazyInit = false; // 保存是否延迟初始化
private int autowireMode = AUTOWIRE_NO; // 保存是否自动装配
private int dependencyCheck = DEPENDENCY_CHECK_NONE; // 保存是否坚持依赖
private String[] dependsOn; // 保存该bean依赖于哪些bean
private boolean autowireCandidate;
private boolean primary;
private final Map<String, AutowireCandidateQualifier> qualifiers;
private boolean nonPublicAccessAllowed;
private boolean lenientConstructorResolution;
private ConstructorArgumentValues constructorArgumentValues; // 保存通过构造函数注入的依赖
private MutablePropertyValues propertyValues; // 保存通过setter方法注入的依赖
private MethodOverrides methodOverrides;
private String factoryBeanName;
private String factoryMethodName;
private String initMethodName; // 对应init-method属性
private String destroyMethodName; // 对应destory-method属性
private boolean enforceInitMethod;
private boolean enforceDestroyMethod;
private boolean synthetic;
private int role;
private String description;
private Resource resource;
...
}
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