GoogleAnalyticsの訪問者数を取得する

                     // Create a query using the DataQuery Object.
                        DataQuery query = new DataQuery(new URL(
                                "https://www.google.com/analytics/feeds/data"));
                        query.setStartDate(today);
                        query.setEndDate(today);
                        query.setMetrics("ga:visitors");
                        query.setIds("ga:XXXXXX");

                        DataFeed dataFeed = analyticsService.getFeed(
                                query.getUrl(), DataFeed.class);

                        long visitors = 0;
                        for (DataEntry entry : dataFeed.getEntries()) {
                            visitors += entry.longValueOf("ga:visitors");
                        }