在Byte-Buddy中，你可以使用InvocationHandler或GeneralInterceptor来拦截方法。下面是使用这两种方式的代码示例：

1. 使用InvocationHandler拦截方法：

import net.bytebuddy.ByteBuddy;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.bind.annotation.AllArguments;
import net.bytebuddy.implementation.bind.annotation.RuntimeType;
import net.bytebuddy.implementation.bind.annotation.SuperCall;
import net.bytebuddy.implementation.bind.annotation.This;

import java.lang.reflect.Method;
import java.util.concurrent.Callable;

public class InvocationHandlerExample {

    public static class MyInvocationHandler {

        @RuntimeType
        public static Object intercept(@AllArguments Object[] args,
                                       @SuperCall Callable callable,
                                       @This Object target,
                                       @Origin Method method) throws Exception {
            System.out.println("Before method: " + method.getName());
            // 在方法调用前执行额外的逻辑
            Object result = callable.call(); // 调用原始方法
            // 在方法调用后执行额外的逻辑
            System.out.println("After method: " + method.getName());
            return result;
        }
    }

    public static void main(String[] args) throws IllegalAccessException, InstantiationException {
        Class dynamicType = new ByteBuddy()
                .subclass(Object.class)
                .method(any())
                .intercept(MethodDelegation.to(MyInvocationHandler.class))
                .make()
                .load(InvocationHandlerExample.class.getClassLoader())
                .getLoaded();

        try {
            Object instance = dynamicType.newInstance();
            instance.toString();
            instance.hashCode();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

在上面的示例中，我们创建了一个InvocationHandler类MyInvocationHandler，它的intercept方法将在方法调用前后执行。使用Byte-Buddy的MethodDelegation将方法委托给该InvocationHandler。

2. 使用GeneralInterceptor拦截方法：

import net.bytebuddy.ByteBuddy;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.bind.annotation.AllArguments;
import net.bytebuddy.implementation.bind.annotation.RuntimeType;
import net.bytebuddy.implementation.bind.annotation.SuperCall;
import net.bytebuddy.implementation.bind.annotation.This;
import net.bytebuddy.matcher.ElementMatchers;

import java.lang.reflect.Method;
import java.util.concurrent.Callable;

public class GeneralInterceptorExample {

    public static class MyInterceptor {

        @RuntimeType
        public static Object intercept(@AllArguments Object[] args,
                                       @SuperCall Callable callable,
                                       @This Object target,
                                       @Origin Method method) throws Exception {
            System.out.println("Before method: " + method.getName());
            // 在方法调用前执行额外的逻辑
            Object result = callable.call(); // 调用原始方法
            // 在方法调用后执行额外的逻辑
            System.out.println("After method: " + method.getName());
            return result;
        }
    }

    public static void main(String[] args) throws IllegalAccessException, InstantiationException {
        DynamicType.Unloaded dynamicType = new ByteBuddy()
                .subclass(Object.class)
                .method(ElementMatchers.any())
                .intercept(MethodDelegation.withDefaultConfiguration()
                        .withBinders(MyInterceptor.Binder.INSTANCE)
                        .to(new MyInterceptor()))
                .make();

        try {
            Class loaded = dynamicType.load(GeneralInterceptorExample.class.getClassLoader())
                    .getLoaded();
            Object instance = loaded.newInstance();
            instance.toString();
            instance.hashCode();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

在上面的示例中，我们创建了一个GeneralInterceptor类MyInterceptor，它的intercept方法将在方法调用前后执行。使用Byte-Buddy的MethodDelegation和withBinders将方法委托给该GeneralInterceptor。

这两种方式的区别在于InvocationHandler是通过反射调用原始方法，而GeneralInterceptor是通过Callable.call()调用原始方法。根据你的需要选择适合的方式。