判断是否为纯数字拼接而成的字符串

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    public static void main(String[] args) {
        //8 表示每个数字的长度
        Pattern pattern = Pattern.compile("([0-9]{8}[,]?)+");
        String bigStr1 = "20170841,1";
        String bigStr2 = "20170841,20170842";


        Matcher isNum1 = pattern.matcher(bigStr1); // matcher是全匹配
        //匹配返回true,否则返回false
        System.out.println(isNum1.matches());
        Matcher isNum2 = pattern.matcher(bigStr2); // matcher是全匹配
        System.out.println(isNum2.matches());   
    }