JAVA ID生成工具类

public final class IdUtil {

    private static final long EPOCH = 1479533469598L; 
    private static final int max12bit = 4095;
    private static final long max41bit= 1099511627775L;
    private static String machineId = "" ; 

    
    public static String create(){

        long time = System.currentTimeMillis() - EPOCH  + max41bit;
        // 二进制的 毫秒级时间戳
        String base = Long.toBinaryString(time);

        // 序列数
        String randomStr = StringUtils.leftPad(Integer.toBinaryString(new Random().nextInt(max12bit)),12,'0');
        if(StringUtils.isNotEmpty(machineId)){
            machineId = StringUtils.leftPad(machineId, 10, '0');
        }

        //拼接
        String appendStr = base + machineId + randomStr;
        // 转化为十进制 返回
        BigInteger bi = new BigInteger(appendStr, 2);

        return  Long.valueOf(bi.toString())+"";
    }
}