静态代理和动态代理_JAVA_编程开发_程序员俱乐部

public interface HelloWorld {
	
	void print(String message);
	void say(String message);

}

public class HelloWorldImp implements HelloWorld{

	@Override
	public void print(String message) {
		// TODO Auto-generated method stub
		System.out.println("Hello "+message);
		
	}

	@Override
	public void say(String message) {
		// TODO Auto-generated method stub
		System.out.println("Say "+message);
	}

}

public class StaticProxy implements HelloWorld{
	private HelloWorld helloWorld;
	
	public StaticProxy(HelloWorld helloWorld) {
		// TODO Auto-generated constructor stub
		this.helloWorld = helloWorld;
	}
	@Override
	public void print(String message) {
		// TODO Auto-generated method stub
		helloWorld.print(message);
	}

	@Override
	public void say(String message) {
		// TODO Auto-generated method stub
		helloWorld.say(message);
		
	}

}

public class Main {
	public static void main(String[] args) {
		HelloWorld helloWorld = new HelloWorldImp();
		StaticProxy staticProxy = new StaticProxy(helloWorld);
		staticProxy.print("world");
		staticProxy.say("world");
	}

}

/**
 * 实现了业务逻辑的分离  低耦合
 * @author Administrator
 *
 */
public class MyInvocationHandler implements InvocationHandler {
	// 要被代理的对象
	private Object object;

	/**
	 * 绑定要被代理额的对象，返回代理对象
	 * 
	 * @param object
	 * @return
	 */
	public Object bindRelation(Object object) {
		this.object = object;

		Object proxy = Proxy.newProxyInstance(object.getClass()
				.getClassLoader(), object.getClass().getInterfaces(), this);
		return proxy;
	}

	/**
	 * 当拦截这个类接口中的方法的时候被调用 一个过滤的作用 可以添加额外方法
	 */
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		// TODO Auto-generated method stub
		// System.out.println("proxy:" + proxy.toString());

		System.out.println("事务开始");
		Object result = method.invoke(object, args);
		System.out.println("事务结束");
		return result;
	}

	public Object getObject() {
		return object;
	}

	public void setObject(Object object) {
		this.object = object;
	}

}

public class Main {
	public static void main(String[] args) {
		HelloWorld helloWorld = new HelloWorldImp();
		MyInvocationHandler invocationHandler = new MyInvocationHandler();
		HelloWorld proxy = (HelloWorld) invocationHandler
				.bindRelation(helloWorld);
		proxy.print("world");
		proxy.say("hello");
	}
}