编写Java动态代理的步骤

编写Java动态代理的步骤如下：

 

1.创建一个实现接口InvocationHandler的类，它必须实现invoke方法

 

2.创建被代理的类以及接口

 

3.通过Proxy的静态方法 

newProxyInstance(ClassLoader loader, Class[] interfaces, InvocationHandler h)

 

 

 

4.通过代理调用方法

package test;

public interface PeopleInfac {
	public void showInfo();

}

 

package test;

public class People implements PeopleInfac {

	public void showInfo() {

		System.out.println("people showInfo()");
	}

}

 

package test;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class DanimacProxy implements InvocationHandler {

	Object o;

	public DanimacProxy(Object o) {
		this.o = o;
	}

	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		method.invoke(o, null);
		return null;
	}
}

 

package test;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

public class Test {

	public static void main(String[] args) {

		People p = new People();

		InvocationHandler proxy = new DanimacProxy(p);

		Class<?> cls = p.getClass();

		PeopleInfac pi = (PeopleInfac) Proxy.newProxyInstance(cls
				.getClassLoader(), cls.getInterfaces(), proxy);

		pi.showInfo();
	}
}