UUID雪花演算法，自動生成ID方法

//建立包名uuid，包下3個實體類
//IdWorker
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/******************************************************************************
 * Copyright (C) 2018-2022 Yantai HaiYi Software Co., Ltd
 * All Rights Reserved.
 * Developed by Yantai Haiyi Software . Without the prior written consent of the company hereto,
 * No party may use, copy, modify or release this software.
 *****************************************************************************/
package com.ruoyi.system.uuid;
​
import java.net.InetAddress;
import java.net.UnknownHostException;
​
import javax.servlet.http.HttpServletRequest;
​
​
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
​
​
​
​
​
/**
 * twitter的SnowFlake演算法獲取18位的數字id
 *
 * @author liulei
 *
 *<p>Modification History:</p>
 *<p>Date                   Author          Description</p>
 *<p>------------------------------------------------------------------</p>
 *<p>2018年8月23日         liulei          新建</p>
 */
public class IdWorker {
    
    private static Long p1;
    private static Long p2;
    private static SnowflakeIdWorker snowflakeIdWorker;
    private IdWorker(){}
    
    /**
     * 獲取一個id
     * @return
     * @author liulei - 2018年8月23日 ：
     */
    public static String getId() {
        if(snowflakeIdWorker == null) {
            if( p1 == null || p2 == null ){
                getP1andP2();
            }
            snowflakeIdWorker = new SnowflakeIdWorker(p1, p2);
        }
        return snowflakeIdWorker.nextId();
    }
    
    private static void getP1andP2(){
        try{
            ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();