java 动态代理DynamicProxy学习

动态代理主要实现类为：InvocationHandler，具体代码如下：

proxyTest.java

public class proxyTest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
        RealSubject mRealSubject = new RealSubject();
        InvocationHandler mInvocationHandler = new DynamicProxy(mRealSubject);
        Subject subject = (Subject)Proxy.newProxyInstance(mInvocationHandler.getClass().getClassLoader(),mRealSubject.getClass().getInterfaces(),mInvocationHandler);
        System.out.println(subject.getClass().getName());
        subject.rent();
        subject.hello("Lin");
	}

}

Subject.java

public interface Subject {

	public void rent();

	public void hello(String str);
}

RealSubject.java

public class RealSubject implements Subject {

	@Override
	public void rent() {
		// TODO Auto-generated method stub
		System.out.println("I want to rent my house");
	}

	@Override
	public void hello(String str) {
		// TODO Auto-generated method stub
		System.out.println("hello: " + str);
	}

}

DynamicProxy.java

public class DynamicProxy implements InvocationHandler {

	
	private Object subject;
	
	public DynamicProxy(Object object){
		subject = object;
	}
	
	@Override
	public Object invoke(Object arg0, Method arg1, Object[] arg2)			throws Throwable {
			throws Throwable 
		// TODO Auto-generated method stub
		   //　　在代理真实对象前我们可以添加一些自己的操作
        System.out.println("before rent house");
        
        System.out.println("Method:" + arg1);
        
        //    当代理对象调用真实对象的方法时，其会自动的跳转到代理对象关联的handler对象的invoke方法来进行调用
        arg1.invoke(subject, arg2);
        
        //　　在代理真实对象后我们也可以添加一些自己的操作
        System.out.println("after rent house");
        
        return null;
	}

}