@Autowired

 private PkGenerator pkGenerator;

 private static final String SEQ_PRIFIX = "DF";

 private static final String SEQ_PRIFIX1 = "DM";

 private static final String SEQ_NAME = "PAYMENT";

 protected String genPk(string type) {

         if (type == "type1" || type == "type2") {

             return pkGenerator.genPk(SEQ_NAME, SEQ_DF_PRIFIX + preReleaseFlag);

         } else {

             return pkGenerator.genPk(SEQ_NAME, SEQ_PRIFIX1 + preReleaseFlag);

         }

     }

package com.utils;

import java.util.Date;

import javax.annotation.Resource;

import org.apache.commons.lang3.time.DateFormatUtils;

import org.springframework.transaction.annotation.Propagation;

import org.springframework.transaction.annotation.Transactional;

/**

 * 序列生成

 *

 *

 */

public class PkGenerator {

    static final String SEQ_DATA_FORMAT = "yyyyMMdd";

    @Resource(name = "accountMapper")

    private Mapper<?> mapper;

    /**

     * 生成序列

     *

     * @param seqName 序列名称

     * @param prefix 前缀

     * @return

     */

    @Transactional(propagation = Propagation.NOT_SUPPORTED)

    public String genPk(String seqName, String prefix) {

        return this.genPk(seqName, prefix, 4);

    }

    /**

     * 生成序列，长度超过设置长度不会跑出异常

     *

     * @param seqName 序列名称

     * @param prefix 前缀

     * @return

     */

    @Transactional(propagation = Propagation.NOT_SUPPORTED)

    public String genPk(String seqName, String prefix, int length) {

        StringBuilder sb = new StringBuilder(prefix);

        int seq = 0;

        seq = mapper.selectSeq(seqName, 1);

        String seqstr =  getFixedLengthString(String.valueOf(seq), length);

        sb.append(DateFormatUtils.format(new Date(), SEQ_DATA_FORMAT)).append(seqstr);

        return sb.toString().toUpperCase();

    }

    /**

     * 生成序列，该序列号不会清零处理，只会进行历史累加</br>

     * 长度超过设置长度抛出异常

     *

     * @param seqName String 序列名称

     * @param length int 固定长度

     *

     * @return

     */

    @Transactional(propagation = Propagation.NOT_SUPPORTED)

    public String genPk2(String seqName, int length) {

        StringBuilder sb = new StringBuilder();

        int seq = 0;

        seq = mapper.getSeqNum(seqName, 1);

        String seqstr =  getFixedLengthString(String.valueOf(seq), length);

        if (seqstr.length() > length)

            throw new IllegalArgumentException("序列号长度超过长度限制。");

        sb.append(seqstr);

        return seqstr;

    }

    /**

     * 生成int类型序列

     *

     * @param seqName 序列名称

     * @return

     */

    @Transactional(propagation = Propagation.NOT_SUPPORTED)

    public int getSeqNum(String seqName) {

        return this.getSeqNum(seqName, 1);

    }

    /**

     * 生成int类型序列

     *

     * @param seqName 序列名称

     * @return

     */

    @Transactional(propagation = Propagation.NOT_SUPPORTED)

    public int getSeqNum(String seqName, int length) {

        return mapper.getSeqNum(seqName, length);

    }

    /**

     * 获取固定长度字符串，不足0补，长度超过直接返回

     */

    public String getFixedLengthString(String raw, int length) {

        if (raw == null)

            throw new MandoErrorMessageException("raw data is null");

        int size = raw.length();

        if (size >= length)

            return raw;

        int fillSize = length - size;

        return new StringBuilder().append(getLengthZero(fillSize)).append(raw).toString();

    }

}

     @Select("call nextval(#{name},#{length})")

     int selectSeq(@Param("name") String name, @Param("length") int length);

     @Select("call nextval_all(#{name},#{length})")

     int getSeqNum(@Param("name") String name, @Param("length") int length);

     <bean class="com.zhonglian.jinjumng.utils.PkGenerator" />