// params definition
    String endpoint = "http://bj.bcm.baidubce.com";
    String userId = "fakeuser1ba678asdf8as7df6a5sdf67";
    String ak = "ak";
    String sk = "sk";
    String scope = "BCE_BCC";
    String metricName = "vCPUUsagePercent";
    String dimensions = "InstanceId:fakeid-2222-8888-1111-13a8469b1fb2";
    Statistics[] statistics = new Statistics[]{Statistics.average,Statistics.maximum};
    long now = System.currentTimeMillis();
    String startTime = DateUtils.formatAlternateIso8601Date(new Date(now - 60 * 60 * 1000));
    String endTime = DateUtils.formatAlternateIso8601Date(new Date(now));
    int periodInSecond = 60;

    // create a bcm client
    BcmClientConfiguration config = new BcmClientConfiguration();
    config.setCredentials(new DefaultBceCredentials(ak, sk));
    config.setEndpoint(endpoint);
    BcmClient bcmClient = new BcmClient(config);

    // query metric data from bcm interface
    MetricDataRequest request = new MetricDataRequest();
    request.withUserId(userId)
            .withScope(scope)
            .withDimensions(dimensions)
            .withMetricName(metricName)
            .withStatistics(statistics)
            .withStartTime(startTime)
            .withEndTime(endTime)
            .withPeriodInSecond(periodInSecond);
    MetricDataResponse response = bcmClient.getMetricData(request);
    System.out.println(JsonUtils.toJsonString(response));