JAva自増流水番号(日付+乱数)

/**
	 * @   java      
	 * 14     + 6    
	 * @   shaomy
	 * @  :2015-1-29   10:57:41
	 * @  :@return 
	 * @   ：String
	 */
	public String getNumberForPK(){
    	String id="";
    	SimpleDateFormat sf = new SimpleDateFormat("yyyyMMddHHmmss");
    	String temp = sf.format(new Date());
		int random=(int) (Math.random()*10000);
		id=temp+random;
		return id;
	}