自动生成序列号（日期-类型）

/**
 * 序列号服务 create by opensesame team
 */
public interface SequenceService {
	 /**
	 * @Author
	 * @Description //TODO 自动生成编号
	 * @Date      2020/2/26 15:26
	 * @Param  contractType 
	 * @return
	 **/
	 String getContractNo(Integer date, String contractType);
}

import com.zmkm.freezer.services.SequenceService;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

/**
 * 序列号服务 create by opensesame team
 */
@Service("sequenceService")
public class SequenceServiceImpl implements SequenceService {

    @Resource
    RedisTemplate<String, Long> redisTemplate;

    /*每天*/
    private static final Long DELTA = 1L;


    @Override
    public String getContractNo(Integer date, String contractType) {
        String key = date + "-" + contractType;
        //以增量的方式将值存储在变量中。
        Long result = redisTemplate.opsForValue().increment(key, DELTA);
        if (result.equals(DELTA)) {
            //过期时间1天
            redisTemplate.expire(key, 1, TimeUnit.DAYS);
        }
        StringBuilder sb = new StringBuilder(contractType);
        sb.append(date);
        int length = String.valueOf(result).length();
        if (length < 3) {
            for (int i = 1; i <= 3-length; i++) {
                sb.append("0");
            }
        }
        sb.append(result);
        return sb.toString();
    }
}