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// ① 定义接口
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public interface UserService {
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    void addUser(String name);
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    void deleteUser(String id);
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}
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// ② 目标类实现接口
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public class UserServiceImpl implements UserService {
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    @Override
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    public void addUser(String name) {
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        System.out.println("添加用户: " + name);
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    }
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    @Override
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    public void deleteUser(String id) {
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        System.out.println("删除用户: " + id);
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    }
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}
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// ③ 创建InvocationHandler
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public class UserServiceProxy implements InvocationHandler {
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    private Object target; // 目标对象
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    public UserServiceProxy(Object target) {
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        this.target = target;
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    }
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    @Override
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    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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        // 前置增强
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        System.out.println("=== 方法执行前：日志记录 ===");
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        // 执行目标方法
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        Object result = method.invoke(target, args);
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        // 后置增强
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        System.out.println("=== 方法执行后：事务提交 ===");
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        return result;
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    }
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}
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// ④ 测试类
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public class Test {
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    public static void main(String[] args) {
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        UserService target = new UserServiceImpl();
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        // 创建代理对象
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        UserService proxy = (UserService) Proxy.newProxyInstance(
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            target.getClass().getClassLoader(),
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            target.getClass().getInterfaces(),
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            new UserServiceProxy(target)
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        );
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        // 调用代理方法
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        proxy.addUser("张三");
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        proxy.deleteUser("001");
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    }
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}

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// ① 目标类（无需实现接口）
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public class UserService {
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    public void addUser(String name) {
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        System.out.println("添加用户: " + name);
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    }
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    public void deleteUser(String id) {
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        System.out.println("删除用户: " + id);
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    }
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}
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// ② 创建MethodInterceptor
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public class CglibProxy implements MethodInterceptor {
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    @Override
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    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
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        // 前置增强
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        System.out.println("=== CGLIB前置增强 ===");
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        // 执行目标方法
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        Object result = proxy.invokeSuper(obj, args);
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        // 后置增强
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        System.out.println("=== CGLIB后置增强 ===");
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        return result;
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    }
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}
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// ③ 创建代理对象
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public class Test {
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    public static void main(String[] args) {
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        Enhancer enhancer = new Enhancer();
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        enhancer.setSuperclass(UserService.class);
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        enhancer.setCallback(new CglibProxy());
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        UserService proxy = (UserService) enhancer.create();
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        proxy.addUser("李四");
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    }
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}