如何在Java Spring中使用泛型实现存储库模式

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String email;

    // Getters and Setters
}

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface GenericRepository<T, ID> extends JpaRepository<T, ID> {
    // 可以在这里添加自定义方法
}

import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends GenericRepository<User, Long> {
    // 可以在这里添加特定于User的查询方法
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public User saveUser(User user) {
        return userRepository.save(user);
    }

    public List<User> getAllUsers() {
        return userRepository.findAll();
    }

    // 其他业务逻辑方法
}

@SuppressWarnings("unchecked")
public <T> T findById(Class<T> clazz, Long id) {
    return (T) entityManager.find(clazz, id);
}

public interface UserRepository extends GenericRepository<User, Long> {
    List<User> findByName(String name);
}