java實現隨機生成UUID
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public class IDGenerator { private static long num=0; /** * 隨機生成UUID * @return */ public static synchronized String getUUID(){ UUID uuid=UUID.randomUUID(); String str = uuid.toString(); String uuidStr=str.replace("-", ""); return uuidStr; } /** * 根據字符串生成固定UUID * @param name * @return */ public static synchronized String getUUID(String name){ UUID uuid=UUID.nameUUIDFromBytes(name.getBytes()); String str = uuid.toString(); String uuidStr=str.replace("-", ""); return uuidStr; } /** * 根據日期生成長整型id * @param args */ public static synchronized long getLongId(){ String date=DateUtil.getDate2FormatString(new Date(), "yyyyMMddHHmmssS"); System.out.println("原始id="+date); if(num>=99) num=0l; ++num; if(num<10) { date=date+00+num; }else{ date+=num; } return Long.valueOf(date); } } |
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