package com.pab.bloan.order.service;/*** Created by */
public interface SequenceGeneratorService {/*** 根据SequenceName获取流水号* @param prefix* @param seqName* @return*/String getSerialNo(String prefix, String seqName);/*** 根据指定的流水号的前缀、长度、SequenceName获取流水号* @param prefix* @param idLength* @param seqName* @return*/String getSerialNo(String prefix, Integer idLength, String seqName);
}

package com.pab.bloan.order.service.impl;import java.util.Date;
import lombok.extern.slf4j.Slf4j;
import com.pab.bloan.order.utils.DateUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import com.pab.bloan.order.dao.bloanb.SequencePojoMapper;
import com.pab.bloan.order.service.SequenceGeneratorService;
import org.springframework.beans.factory.annotation.Autowired;/*** 获取流水号服务* Created by */
@Slf4j
@Service
public class SequenceGeneratorServiceImpl implements SequenceGeneratorService {@Autowiredprivate SequencePojoMapper sequencePojoMapper;/*** {@inheritDoc}* @param seqName* @return*/@Overridepublic String getSerialNo(String prefix, String seqName) {return getSerialNo(prefix, 0, seqName);}/*** {@inheritDoc}* @param prefix* @param idLength* @param seqName* @return*/@Overridepublic String getSerialNo(String prefix, Integer idLength, String seqName) {try {if (StringUtils.isEmpty(seqName)) {return "";}if (idLength < 8){idLength = 8;} else if (idLength > 12){idLength = 12;}String dateString = DateUtils.formatDate(new Date(),"yyyy/MM/dd");dateString = dateString.replace("/", "");StringBuilder sequenceSqlBuilder = new StringBuilder();sequenceSqlBuilder.append(" select ");sequenceSqlBuilder.append(seqName + ".NEXTVAL");sequenceSqlBuilder.append(" FROM DUAL ");Long sequenceId = sequencePojoMapper.getSequenceBySequenceName(sequenceSqlBuilder.toString());String seqIdString = String.format("%0" + idLength + "d", sequenceId);String serialNo;if (seqIdString.length() > idLength) {serialNo = String.format("%s%s%s", prefix, dateString, seqIdString.substring(seqIdString.length() - idLength, seqIdString.length()));} else {serialNo = String.format("%s%s%s", prefix, dateString, seqIdString);}return serialNo;} catch (Exception e) {log.error("SequenceGeneratorService.getSerialNo", e);}return "";}
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.pab.bloan.order.dao.bloanb.SequencePojoMapper"><select id="getSequenceBySequenceName" resultType="java.lang.Long"useCache="false" flushCache="true">${sql}</select>
</mapper>