使用spring data mongoDB创建新文档(保存)时将_id复制到新字段

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.data.mongodb.core.mapping.Field;

@Document(collection = "your_collection_name")
public class YourEntity {
    @Id
    private String id;

    @Field("_id")
    private String customId;

    // 其他字段和方法...
}

import org.springframework.data.mongodb.repository.MongoRepository;

public interface YourRepository extends MongoRepository<YourEntity, String> {
    default YourEntity saveWithCustomId(YourEntity entity) {
        entity.setCustomId(entity.getId());
        return save(entity);
    }
}

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

@Service
public class YourService {
    private final YourRepository yourRepository;

    @Autowired
    public YourService(YourRepository yourRepository) {
        this.yourRepository = yourRepository;
    }

    public void saveNewDocument(YourEntity entity) {
        yourRepository.saveWithCustomId(entity);
    }
}