fuint-application/application-service/src/main/java/com/fuint/application/util/SeqUtil.java

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package com.fuint.application.util;

import java.math.BigInteger;
import java.util.Calendar;
import java.util.UUID;
import java.util.concurrent.ThreadLocalRandom;

/**
 * 序列工具类
 * Created by FSQ
 * Contact wx fsq_better
 * Site https://www.fuint.cn
 */
public class SeqUtil {

    /**
     * 产生字符串序列(长度:32)
     *
     * @return String 32位字符串序列
     */
    public static String getUUID() {
        String uuid = UUID.randomUUID().toString();
        return uuid.replaceAll("\\-", "").toUpperCase();
    }

    /**
     * 产生日期序列(长度:32)
     * [yyyyMMddHHmmssSSS+15位随机数]
     *
     * @return Long
     */
    public static BigInteger getTimeSeq() {
        String date = CommonUtil.formatDate(Calendar.getInstance().getTime(), "yyyyMMddHHmmssSSS");
        StringBuilder sb = new StringBuilder();
        sb.append(date);
        int length = 32 - sb.length();
        String randNum = getRandomNumber(length);
        sb.append(randNum);
        return new BigInteger(sb.toString());
    }

    /**
     * 产生日期序列(长度:大于17位)
     * [yyyyMMddHHmmssSSS+15位随机数]
     *
     * @return Long
     */
    public static String getTimeSeq(int length) {
        String date = CommonUtil.formatDate(Calendar.getInstance().getTime(), "yyyyMMddHHmmssSSS");
        StringBuilder sb = new StringBuilder();
        sb.append(date);
        length = length - sb.length();
        if (length > 0) {
            String randNum = getRandomNumber(length);
            sb.append(randNum);
        }
        return sb.toString();
    }

    /**