public interface IStudentDao {
	void read();
}

public class StudentDao implements IStudentDao{
	@Override
	public void read() {
		System.out.println("正在讀書(shū)中。。。。。");
	}
}

public class StudentDaoProxy implements IStudentDao{
	// 被代理類聚合到代理類
	private StudentDao studentDao;
	public StudentDaoProxy(StudentDao studentDao) {
		// 通過(guò)構(gòu)造器傳入聚合對(duì)象，也可以通過(guò)set方法傳入
		this.studentDao=studentDao;
	}
	@Override
	public void read() {
		// 增強(qiáng)方法，這里可以寫(xiě)其他復(fù)雜業(yè)務(wù)
		System.out.println("打開(kāi)書(shū)本。。。。。");
		//被代理類原方法
		studentDao.read();
	}
}

public class Client {
	public static void main(String[] args) {
		StudentDao studentDao = new StudentDao();
		StudentDaoProxy studentDaoProxy = new StudentDaoProxy(studentDao);
		// 使用代理方法
		studentDaoProxy.read();
	}
}

public interface IStudentDao {
	void read();
}

public class StudentDao implements IStudentDao{
	@Override
	public void read() {
		System.out.println("正在讀書(shū)中。。。。。");
	}
}

public class ProxyFactory{
	// 被代理類聚合到代理類
	private Object target;
	public ProxyFactory(Object studentDao) {
		// 通過(guò)構(gòu)造器傳入聚合對(duì)象，也可以通過(guò)set方法傳入
		this.target=studentDao;
	}
	//給目標(biāo)對(duì)象 生成一個(gè)代理對(duì)象
	public Object getProxyInstance() {
			//說(shuō)明
			/*
			 *  public static Object newProxyInstance(ClassLoader loader,
	                                          Class<?>[] interfaces,
	                                          InvocationHandler h)	                                          
	            //1. ClassLoader loader ： 指定當(dāng)前目標(biāo)對(duì)象使用的類加載器, 獲取加載器的方法固定
	            //2. Class<?>[] interfaces: 目標(biāo)對(duì)象實(shí)現(xiàn)的接口類型，使用泛型方法確認(rèn)類型
	            //3. InvocationHandler h : 事情處理，執(zhí)行目標(biāo)對(duì)象的方法時(shí)，會(huì)觸發(fā)事情處理器方法, 會(huì)把當(dāng)前執(zhí)行的目標(biāo)對(duì)象方法作為參數(shù)傳入
			 */
			return Proxy.newProxyInstance(target.getClass().getClassLoader(), 
					target.getClass().getInterfaces(), 
					new MyInvocationHandler()); 
		}
		 class MyInvocationHandler implements InvocationHandler{
			@Override
			public Object invoke(Object proxy, Method method, Object[] args)  throws Throwable {
				// 自定義業(yè)務(wù)邏輯
				System.out.println("JDK代理開(kāi)始~~");
				//反射機(jī)制調(diào)用目標(biāo)對(duì)象的方法
				Object returnVal = method.invoke(target, args);
				System.out.println("JDK代理提交");
				return returnVal;
			}
		}
}

public class Client {
	public static void main(String[] args) {
		StudentDao studentDao = new StudentDao();
		ProxyFactory studentDaoProxy = new ProxyFactory(studentDao);
		// 使用代理方法,注意這里一定要用接口接收
		IStudentDao studentDao2 = (IStudentDao) studentDaoProxy.getProxyInstance();
		studentDao2.read();
	}
} 

public class StudentDao implements IStudentDao{
	@Override
	public void read() {
		System.out.println("正在讀書(shū)中。。。。。");
	}
}

public class ProxyFactory implements MethodInterceptor{
	//維護(hù)一個(gè)目標(biāo)對(duì)象
		private Object target;
		//構(gòu)造器，傳入一個(gè)被代理的對(duì)象
		public ProxyFactory(Object target) {
			this.target = target;
		}
		//返回一個(gè)代理對(duì)象:  是 target 對(duì)象的代理對(duì)象
		public Object getProxyInstance() {
			//1. 創(chuàng)建一個(gè)工具類
			Enhancer enhancer = new Enhancer();
			//2. 設(shè)置父類
			enhancer.setSuperclass(target.getClass());
			//3. 設(shè)置回調(diào)函數(shù)
			enhancer.setCallback(this);
			//4. 創(chuàng)建子類對(duì)象，即代理對(duì)象
			return enhancer.create();
		}
		//重寫(xiě)  intercept 方法，會(huì)調(diào)用目標(biāo)對(duì)象的方法
		@Override
		public Object intercept(Object arg0, Method method, Object[] args, MethodProxy arg3) throws Throwable {
			// TODO Auto-generated method stub
			System.out.println("Cglib代理模式 ~~ 開(kāi)始");
			Object returnVal = method.invoke(target, args);
			System.out.println("Cglib代理模式 ~~ 提交");
			return returnVal;
		}
}

public class Client {
	public static void main(String[] args) {
		StudentDao studentDao = new StudentDao();
		ProxyFactory studentDaoProxy = new ProxyFactory(studentDao);
		StudentDao studentDao2 = (StudentDao)studentDaoProxy.getProxyInstance();
		studentDao2.read();
	}
}