import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeSupport;

import java.util.Date;

public class StudentBean {

	private String name;

	private int age;

	private Date birthday;

	//创建委托。

	private PropertyChangeSupport pcs = new PropertyChangeSupport(this);

	public StudentBean() {

	}

	public StudentBean(String name) {

		this.name = name;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		String oldvalue = this.name;

		this.name = name;

		//激发帧听器。

		pcs.firePropertyChange("name", oldvalue, this.name);

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		this.age = age;

	}

	public Date getBirthday() {

		return birthday;

	}

	public void setBirthday(Date birthday) {

		this.birthday = birthday;

	}

	//加入帧听方法。

	public void addPropertyChangeListener(PropertyChangeListener listener)

	{

		pcs.addPropertyChangeListener(listener);

	}

	//加入移除帧听方法。

	public void removePropertyChangeListener(PropertyChangeListener listener)

	{

		pcs.removePropertyChangeListener(listener);

	}

}

import java.beans.IntrospectionException;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.beans.PropertyChangeSupport;

import java.beans.PropertyDescriptor;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

public class IntrospectorTest {

	public static void main(String[] args)

	{

		try{

		Class st = Class.forName("StudentBean");

		Constructor<StudentBean> cct = st.getConstructor(null);

		StudentBean sbean = cct.newInstance();

		//注册帧听器。

		sbean.addPropertyChangeListener(new PropertyChangeListener(){

			@Override

			public void propertyChange(PropertyChangeEvent evt) {

				System.out.println(evt.getPropertyName()+":"+evt.getOldValue()+":"

						+evt.getNewValue());

			}

		 } );

		//内省获取Bean字段描述。

		PropertyDescriptor pd = new PropertyDescriptor("name", StudentBean.class);

		//开启对该字段的帧听。

		pd.setBound(true);

		Method namgget = pd.getWriteMethod();

		namgget.invoke(sbean, "wangwu");

		System.out.println(sbean.getName());

		}catch(Exception e)

		{

			e.printStackTrace();

		}

	}

}