JDK动态代理例子

public interface Character {
    public void show();
}

public class A implements Character{

    @Override
    public void show() {
        // TODO Auto-generated method stub
        System.out.println("this is A");
    }
    
}

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


public class JdkProxy implements InvocationHandler{
    private Object delegate;
    public Object bind(Object delegate){
        this.delegate = delegate;
　　　　　//利用反射机制生成一个代理对象
        return Proxy.newProxyInstance(delegate.getClass().getClassLoader(), delegate.getClass().getInterfaces(), this);
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        // TODO Auto-generated method stub
        Object result = null;
　　　　　
        System.out.println("JdkProxy invoke");
　　　　 //此处是调用了目标类的方法，所以在该方法执行的前后可以插入其他的事务逻辑，并且可以更改传入的参数和返回的结果
        result = method.invoke(delegate, args);
        return result;
    }

}

public static void main(String[] args){
        Character c = (Character)((new JdkProxy()).bind(new A()));
        c.show();
    }

JdkProxy invoke
this is A