简单的代理-jdk代理

1  申明一个接口

public interface  JdkProxyDemo{
     void sayHi(String name);
}

2 实现这个接口

public class JdkProxyDemoImpl implements  JdkProxyDemo {
    @Override
    public void sayHi(String name) {
        System.out.println("hello " + name);
    }
}

3 实现InvocationHandler接口完成代理功能

public class JdkProxyDemoHandler implements InvocationHandler {

    //真实的对象
    private Object target;
    //返回的服务代理对象
    public Object bind(Object target){
             this.target = target;
             return Proxy.newProxyInstance(target.getClass().getClassLoader()
                     ,target.getClass().getInterfaces(),this);
    }


    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("start-----------");
        Object invoke = method.invoke(target, args);
        System.out.println("end-------------");
        return invoke;
    }

    public static void main(String[] args) {
        JdkProxyDemoHandler jdkProxyDemoHandler =new JdkProxyDemoHandler();
        JdkProxyDemo jdkProxyDemo = (JdkProxyDemo) jdkProxyDemoHandler.bind(new JdkProxyDemoImpl());
        jdkProxyDemo.sayHi("jj");      
    }
}