Java PropertyChangeListener

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/**
 * Project Name:Micro-Services-RPC-Message
 * File Name   :PropertyChangeListener.java
 * Package Name:test.event
 * Date:2015-9-9上午10:02:40
 * Copyright (c) 2015, http://my.oschina.net/httpssl All Rights Reserved.
 *
*/

package test.event;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.io.PrintStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Date;

import org.apache.commons.lang3.event.EventListenerSupport;
import org.apache.commons.lang3.reflect.FieldUtils;

import com.micro.services.common.utils.ReflectUtils;

/**
 * ClassName:PropertyChangeListener <br/>
 * Function :TODO ADD 测试 学习 对象属性监听. <br/>
 * Reason	:TODO PropertyChangeEvent,VetoableChangeListener. <br/>
 * Date     :2015-9-9 上午10:02:40 <br/>
 * @author  :http://my.oschina.net/httpssl
 * @since   :JDK 1.7
 * @see 	 
 */
public class PropertyChangeListener
{
	public static class EventWorker{
		
		public static final String PROP_WORKSTATE = "workState";
		
		private final int id;
		private final String name;
		private volatile String workState ;
		public EventWorker(int id, String name)
		{
			super();
			this.id = id;
			this.name = name;
		}
		public EventWorker(int id, String name, String workState)
		{
			super();
			this.id = id;
			this.name = name;
			this.workState = workState;
		}
		public String getWorkState() {
			return workState;
		}
		public void setWorkState(String workState) {
			this.workState = workState;
		}
		 
	}

	public static void main(String[] args) throws PropertyVetoException {
		final EventListenerSupport<VetoableChangeListener> listenerSupport = EventListenerSupport.create(VetoableChangeListener.class);
//		listenerSupport.addListener(null);//不能添加一个null对象
//		listenerSupport.removeListener(null);//不能移除一个null
		
		VetoableChangeListener newVetoableChangeListener = new VetoableChangeListener()
		{
			/*
			 * 
			 * TODO VetoableChangeListener 监听对象 触发属性 change时触发
			 * @see java.beans.VetoableChangeListener#vetoableChange(java.beans.PropertyChangeEvent)
			 */
			@Override
			public void vetoableChange(PropertyChangeEvent evt) throws PropertyVetoException {
				PrintStream stream = System.err;
				if(!ReflectUtils.isPrimitive(evt.getSource().getClass())){
					try {
						Field field = evt.getSource().getClass().getDeclaredField(evt.getPropertyName());
						 //
						 if (!field.isAccessible()) {
								field.setAccessible(true);
						 }
						 FieldUtils.writeField(field, evt.getSource(), evt.getNewValue());
					} catch (NoSuchFieldException e) {
						stream.append(e.getMessage());
					} catch (SecurityException e) {
						stream.append(e.getMessage());
					} catch (IllegalAccessException e) {
						stream.append(e.getMessage());
					} finally{
						stream.println();
					}
					System.out.println(evt.getPropertyName()+" "+evt.getOldValue()+"  -> "+evt.getNewValue());
				}
			}
		};
		
		EventWorker developer = new EventWorker(1,"开发A","正在开发");
		
		listenerSupport.addListener(newVetoableChangeListener);
		//一定要写在addListener 后
		listenerSupport.fire().vetoableChange(new PropertyChangeEvent(developer,EventWorker.PROP_WORKSTATE,developer.getWorkState(),"完成了"));
		
		System.out.println("在方法外 查看:::"+developer.getWorkState());
		
		
		final EventListenerSupport<VetoableChangeListener> eventListenerSupport2 = new EventListenerSupport<VetoableChangeListener>(VetoableChangeListener.class){
			
			private static final long	serialVersionUID	= 1L;
			
			protected java.lang.reflect.InvocationHandler createInvocationHandler() {
				return new ProxyInvocationHandler(){
					/*
					 * 
					 * TODO 简单描述该方法的实现功能（可选）. 
					 * @see org.apache.commons.lang3.event.EventListenerSupport.ProxyInvocationHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
					 */
					@Override
					public Object invoke(Object proxy, Method method, Object[] args)
							throws Throwable {
						return super.invoke(proxy, method, args);
					}
				};
			}
			
		};
		
		final VetoableChangeListener listener = new VetoableChangeListener()
		{
			@Override
			public void vetoableChange(PropertyChangeEvent evt) throws PropertyVetoException {
				System.out.println(evt.getPropertyName()+" "+evt.getOldValue()+"  -> "+evt.getNewValue());
			}
		};
		eventListenerSupport2.addListener(listener);
		final Date source = new Date();
		
		final PropertyChangeEvent ignore = new PropertyChangeEvent(source, "Hour", 5, 6);
        final PropertyChangeEvent respond = new PropertyChangeEvent(source, "Day", 6, 7);
        listener.vetoableChange(respond);
        eventListenerSupport2.fire().vetoableChange(ignore);
        eventListenerSupport2.fire().vetoableChange(respond);
        
	}
	
}

Java PropertyChangeListener

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原文地址：http://my.oschina.net/httpssl/blog/503633