@Test
public void getStatisticTest() {

    String filePath = "G:\\DBIIR\\rainbow-demo\\rainbow-web\\src\\main\\resources\\pipline\\3fd97c0a9714cc7ea8d3277c535483cb\\statistic.txt";
    String queryID;
    Random r = new Random();
    int time = 0;
    for (int i = 0; i < 100; i++) {
        queryID = UUID.randomUUID().toString();
        time = r.nextInt(100);
        try {
            cn.edu.ruc.iir.rainbow.web.util.FileUtil.appendFile(queryID + "\t" + time, filePath);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}