import java.text.SimpleDateFormat;import java.util.Date;/** 
 * 获取long型唯一ID */public class ID
{    private static long tmpID = 0;    private static boolean tmpIDlocked = false;    public static long getId()
    {        long ltime = 0;        while (true)
        {            if(tmpIDlocked == false)
            {
                tmpIDlocked = true;                //当前：（年、月、日、时、分、秒、毫秒）*10000
                ltime = Long.valueOf(new SimpleDateFormat("yyMMddhhmmssSSS").format(new Date()).toString()) * 10000;                if(tmpID < ltime)
                {
                    tmpID = ltime;
                }                else
                {
                    tmpID = tmpID + 1;
                    ltime = tmpID;
                }
                tmpIDlocked = false;                return ltime;
            }
        }
    }
}

Java工具类：获取long型唯一ID