1. 首先，派生MethodIntercepter接口，override intercept方法，在調(diào)用目標(biāo)類方法的前后加上額外的邏輯
2. 其次，使用Enhancer對(duì)象注冊(cè)目標(biāo)類和代理類，動(dòng)態(tài)生成代理對(duì)象

public class SomeBase{
  public void someMethod(){
    System.out.println("call SomeBase.someMethod");
  }
}

public class SomeProxy implement MethodInterceptor{
  @Override
  public Object intercept(Object object, Method method, Object[] args, MethodProxy proxy) throws Throwable{
    System.out.println("Before calling SomeBase.someMethod");
    proxy.invokeSuper(object, args);
    System.out.println("After calling SomeBase.someMethod ");
  }
}

public class Test{
  public static void main(String[] args){
   Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(SomeBase.class);

    SomeProxy proxy = new SomeProxy();
    enhancer.setCallback(proxy);

    SomeBase base = (SomeBase)enhancer.create();

    base.someMethod(); 
  }
}