獲取當前年月日時分秒+四位隨機數組成的標識

private String getNumber(){

        StringBuffer stringBuffer = new StringBuffer();
        Date t = new Date();
        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
        stringBuffer.append(df.format(t));
        int ran=(int)(Math.random()*9000)+1000;
        stringBuffer.append(String.valueOf(ran));
        return stringBuffer.toString();
    }