1.Hbase 根据rowkey 查询

conf的配置信息如下：

        conf = new Configuration();

        conf.set("hbase.zookeeper.quorum", "192.168.50.253:2181");

        conf.set("hbase.rootdir", "hdfs://192.168.50.253:9000/hbase");

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public ArrayList<String>  getRoutes(String rowkey,String tablename) throws IOException {

        HTable hTable = new HTable(conf, tablename);//traffic_route

        Get get = new Get(rowkey.getBytes());

        Result r = hTable.get(get);

        KeyValue[] kv = r.raw();  // 行健对应的值.

        ArrayList<String> list = new ArrayList<>();

        if (kv.length > 0) {

            String ss = kv[0].getValue().toString();

            DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

            Date tempDay = new Date();

            tempDay = null;

            int sum = 0;

            String tempDate = "";

            String mapStringValue = "";

            for (int i = 0; i < kv.length; i++) {

                String value = new String(kv[i].getValue());

//            System.out.println("value = " + value);

                String[] station = value.split("--");

//            System.out.println(station[0]);

                String[] date = station[0].split(" ");

                try {

                    Date day = sdf.parse(date[0]);

                    if (tempDay == null) {

                        tempDay = day;

                    }

                    if ((day.compareTo(tempDay) == 0)) {

                        tempDate = date[0];

                        mapStringValue = mapStringValue + station[1] + "-";

                    } else {

                        Map<String, String> map = new HashMap<>();

                        map.put(tempDate, mapStringValue);

                        list.add(mapStringValue);

                        mapStringValue = "";

                        tempDay = day;

                        mapStringValue += station[1] + "-";

                    }

                } catch (ParseException e) {

                    e.printStackTrace();

                }

            }

//        System.out.println("list  = " + list.size());

            Map<String, String> map = new HashMap<>();

            map.put(tempDate, mapStringValue);

            list.add(mapStringValue);

            mapStringValue = "";

        }

//        System.out.println("list.get(0)  = " + list.get(0));

//        System.out.println("list.get(1)  = " + list.get(1));

            if (list.size() == 0) {

                System.out.println("取出数据为空");

            } else {

                System.out.println("获取数据成功");

            }

            return list;

        }

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