java实现随机生成UUID

java实现随机生成uuid

public class idgenerator {
   
  private static long num=0; 
   
  /**
   * 随机生成uuid
   * @return
   */
  public static synchronized string getuuid(){
    uuid uuid=uuid.randomuuid();
    string str = uuid.tostring(); 
    string uuidstr=str.replace("-", "");
    return uuidstr;
  }
  /**
   * 根据字符串生成固定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;
  }
  /**
   * 根据日期生成长整型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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