使用Java编程和springboot框架实现创建活动并关联奖品，一个活动必须关联8个奖品，总概率为100% ,奖品表为a，活动表为b,抽奖活动表为ab,给出完整程序

好的，我可以帮你提供一个简单的Java代码实现，使用Spring Boot框架，创建3个实体类：Activity、Prize、LotteryActivity，以及它们之间的关系。具体代码实现如下：

Activity.java

@Entity
@Table(name = "activity")
public class Activity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    @OneToMany(mappedBy = "activity", cascade = CascadeType.ALL)
    private List<Prize> prizes;

    @OneToOne(mappedBy = "activity")
    private LotteryActivity lotteryActivity;

    // getters and setters
}

Prize.java

@Entity
@Table(name = "prize")
public class Prize {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    private double probability;

    @ManyToOne
    @JoinColumn(name = "activity_id")
    private Activity activity;

    // getters and setters
}

LotteryActivity.java

@Entity
@Table(name = "lottery_activity")
public class LotteryActivity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToOne
    @JoinColumn(name = "activity_id")
    private Activity activity;

    // getters and setters
}

接下来，在Spring Boot的启动类中，添加注解@EnableJpaRepositories并配置JPA数据源：

@SpringBootApplication
@EnableJpaRepositories(basePackages = "com.example.lottery.repository")
public class LotteryApplication {
    public static void main(String[] args) {
        SpringApplication.run(LotteryApplication.class, args);
    }
}

在repository包中，创建3个Repository：ActivityRepository、PrizeRepository、LotteryActivityRepository，分别对应3个实体类。

ActivityRepository.java

@Repository
public interface ActivityRepository extends JpaRepository<Activity, Long> {
    // 自定义查询方法
}

PrizeRepository.java

@Repository
public interface PrizeRepository extends JpaRepository<Prize, Long> {
    // 自定义查询方法
}

LotteryActivityRepository.java

@Repository
public interface LotteryActivityRepository extends JpaRepository<LotteryActivity, Long> {
    // 自定义查询方法
}

最后，创建一个Service，提供创建活动并关联奖品的方法：

@Service
public class LotteryService {
    @Autowired
    private ActivityRepository activityRepository;

    @Autowired
    private PrizeRepository prizeRepository;

    @Autowired
    private LotteryActivityRepository lotteryActivityRepository;

    @Transactional
    public Activity createActivityWithPrizes(String name, List<String> prizeNames, List<Double> probabilities) {
        // 创建活动
        Activity activity = new Activity();
        activity.setName(name);

        // 计算奖品总概率
        double totalProbability = 0;
        for (double probability : probabilities) {
            totalProbability += probability;
        }
        if (totalProbability != 1.0) {
            throw new IllegalArgumentException("奖品总概率必须为1.0");
        }

        // 创建奖品并关联活动
        List<Prize> prizes = new ArrayList<>();
        for (int i = 0; i < prizeNames.size(); i++) {
            Prize prize = new Prize();
            prize.setName(prizeNames.get(i));
            prize.setProbability(probabilities.get(i));
            prize.setActivity(activity);
            prizes.add(prize);
        }
        activity.setPrizes(prizes);

        // 创建抽奖活动并关联活动
        LotteryActivity lotteryActivity = new LotteryActivity();
        lotteryActivity.setActivity(activity);
        activity.setLotteryActivity(lotteryActivity);

        // 保存数据
        activity = activityRepository.save(activity);
        for (Prize prize : prizes) {
            prizeRepository.save(prize);
        }
        lotteryActivityRepository.save(lotteryActivity);

        return activity;
    }
}

这样，一个简单的Java程序就实现了创建活动并关联奖品的功能。当然，具体实现还需要根据实际情况进行调整和优化。