static void split(BufferedReader br, String fileName, int count) {
		int i = 0;
		String line = null;
		FileWriter fw = null;
		BufferedWriter bw = null;
		try {
			fw = new FileWriter(fileName);
			bw = new BufferedWriter(fw);
			while ((line = br.readLine()) != null && i < count) {
				line = line.substring(1, line.length() - 1);
				if (isNum(line)) {
					bw.write(line + "\n");
					i ++;
				} else {
					System.err.printf("fileName:%s, count:%d read string[%s] error, not num \n", fileName, count, line);
				}
			}
		} catch (Exception e) {
			System.err.printf("fileName:%s, count:%d error \n", fileName, count);
			e.printStackTrace();
		} finally {
			closeIO(bw);
			closeIO(fw);
		}
	}