Java高新技术——内省Introspector（JavaBean）

Java高新技术——内省（JavaBean）下面这篇文章写的不错，通俗易懂，建议先看下文章中的示例：https://blog.csdn.net/zhongkelee/article/details/52678667

下面是JDK javabean package 文档说明: https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/beans/package-summary.html

截取仅供快速参考。

• Interface Summary

  Interface	Description
  AppletInitializer	Deprecated. The Applet API is deprecated.
  BeanInfo	Use the BeanInfo interface to create a BeanInfo class and provide explicit information about the methods, properties, events, and other features of your beans.
  Customizer	A customizer class provides a complete custom GUI for customizing a target Java Bean.
  DesignMode	This interface is intended to be implemented by, or delegated from, instances of java.beans.beancontext.BeanContext, in order to propagate to its nested hierarchy of java.beans.beancontext.BeanContextChild instances, the current "designTime" property.
  ExceptionListener	An ExceptionListener is notified of internal exceptions.
  PropertyChangeListener	A "PropertyChange" event gets fired whenever a bean changes a "bound" property.
  PropertyEditor	A PropertyEditor class provides support for GUIs that want to allow users to edit a property value of a given type.
  VetoableChangeListener	A VetoableChange event gets fired whenever a bean changes a "constrained" property.
  Visibility	Under some circumstances a bean may be run on servers where a GUI is not available.

• Class Summary

  Class	Description
  BeanDescriptor	A BeanDescriptor provides global information about a "bean", including its Java class, its displayName, etc.
  Beans	This class provides some general purpose beans control methods.
  DefaultPersistenceDelegate	The DefaultPersistenceDelegate is a concrete implementation of the abstract PersistenceDelegate class and is the delegate used by default for classes about which no information is available.
  Encoder	An Encoder is a class which can be used to create files or streams that encode the state of a collection of JavaBeans in terms of their public APIs.
  EventHandler	The EventHandler class provides support for dynamically generating event listeners whose methods execute a simple statement involving an incoming event object and a target object.
  EventSetDescriptor	An EventSetDescriptor describes a group of events that a given Java bean fires.
  Expression	An Expression object represents a primitive expression in which a single method is applied to a target and a set of arguments to return a result - as in "a.getFoo()".
  FeatureDescriptor	The FeatureDescriptor class is the common baseclass for PropertyDescriptor, EventSetDescriptor, and MethodDescriptor, etc.
  IndexedPropertyChangeEvent	An "IndexedPropertyChange" event gets delivered whenever a component that conforms to the JavaBeans™ specification (a "bean") changes a bound indexed property.
  IndexedPropertyDescriptor	An IndexedPropertyDescriptor describes a property that acts like an array and has an indexed read and/or indexed write method to access specific elements of the array.
  Introspector	The Introspector class provides a standard way for tools to learn about the properties, events, and methods supported by a target Java Bean.
  MethodDescriptor	A MethodDescriptor describes a particular method that a Java Bean supports for external access from other components.
  ParameterDescriptor	The ParameterDescriptor class allows bean implementors to provide additional information on each of their parameters, beyond the low level type information provided by the java.lang.reflect.Method class.
  PersistenceDelegate	The PersistenceDelegate class takes the responsibility for expressing the state of an instance of a given class in terms of the methods in the class's public API.
  PropertyChangeEvent	A "PropertyChange" event gets delivered whenever a bean changes a "bound" or "constrained" property.
  PropertyChangeListenerProxy	A class which extends the EventListenerProxy specifically for adding a PropertyChangeListener with a "bound" property.
  PropertyChangeSupport	This is a utility class that can be used by beans that support bound properties.
  PropertyDescriptor	A PropertyDescriptor describes one property that a Java Bean exports via a pair of accessor methods.
  PropertyEditorManager	The PropertyEditorManager can be used to locate a property editor for any given type name.
  PropertyEditorSupport	This is a support class to help build property editors.
  SimpleBeanInfo	This is a support class to make it easier for people to provide BeanInfo classes.
  Statement	A Statement object represents a primitive statement in which a single method is applied to a target and a set of arguments - as in "a.setFoo(b)".
  VetoableChangeListenerProxy	A class which extends the EventListenerProxy specifically for adding a VetoableChangeListener with a "constrained" property.
  VetoableChangeSupport	This is a utility class that can be used by beans that support constrained properties.
  XMLDecoder	The XMLDecoder class is used to read XML documents created using the XMLEncoder and is used just like the ObjectInputStream.
  XMLEncoder	The XMLEncoder class is a complementary alternative to the ObjectOutputStream and can used to generate a textual representation of a JavaBean in the same way that the ObjectOutputStream can be used to create binary representation of Serializable objects.

• Exception Summary

  Exception	Description
  IntrospectionException	Thrown when an exception happens during Introspection.
  PropertyVetoException	A PropertyVetoException is thrown when a proposed change to a property represents an unacceptable value.

• Annotation Types Summary

  Annotation Type	Description
  BeanProperty	An annotation used to specify some property-related information for the automatically generated BeanInfo classes.
  ConstructorProperties	An annotation on a constructor that shows how the parameters of that constructor correspond to the constructed object's getter methods.
  JavaBean	An annotation used to specify some class-related information for the automatically generated BeanInfo classes.
  Transient	Indicates that an attribute called "transient" should be declared with the given value when the Introspector constructs a PropertyDescriptor or EventSetDescriptor classes associated with the annotated code element.

PropertyDescriptor​(String propertyName, Class<?> beanClass)


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Introspector的静态方法：
static String	decapitalize​(String name)	
Utility method to take a string and convert it to normal Java variable name capitalization.
static void	flushCaches()	
Flush all of the Introspector's internal caches.
static void	flushFromCaches​(Class<?> clz)	
Flush the Introspector's internal cached information for a given class.
static BeanInfo	getBeanInfo​(Class<?> beanClass)	
Introspect on a Java Bean and learn about all its properties, exposed methods, and events.
static BeanInfo	getBeanInfo​(Class<?> beanClass, int flags)	
Introspect on a Java bean and learn about all its properties, exposed methods, and events, subject to some control flags.
static BeanInfo	getBeanInfo​(Class<?> beanClass, Class<?> stopClass)	
Introspect on a Java bean and learn all about its properties, exposed methods, below a given "stop" point.
static BeanInfo	getBeanInfo​(Class<?> beanClass, Class<?> stopClass, int flags)	
Introspect on a Java Bean and learn about all its properties, exposed methods and events, below a given stopClass point subject to some control flags.
static String[]	getBeanInfoSearchPath()	
Gets the list of package names that will be used for finding BeanInfo classes.
static void	setBeanInfoSearchPath​(String[] path)	
Change the list of package names that will be used for finding BeanInfo classes.