如何在自定义RestTemplate中使用Spring Cache Redis？

@Bean
@Cacheable(cacheNames = "myCache", keyGenerator = "myKeyGenerator")
public RestTemplate myRestTemplate() {
    return new RestTemplate();
}

@Bean
public KeyGenerator myKeyGenerator() {
    return (target, method, params) -> {
        StringBuilder sb = new StringBuilder();
        sb.append(target.getClass().getName());
        sb.append(method.getName());
        for (Object param : params) {
            sb.append(param.toString());
        }
        return sb.toString();
    };
}

@Cacheable(cacheNames = "myCache", key = "#id")
public User getUserById(String id) {
    // 从数据库或其他数据源获取用户信息
    return userRepository.findById(id);
}

public User getUserById(String id) {
    User user = restTemplate.getForObject("http://api.example.com/users/{id}", User.class, id);
    // 将获取到的用户信息缓存起来
    return user;
}