java操作Hbase

public class Test {
    public Connection connection;
    // 用HBaseconfiguration初始化配置信息是会自动加载当前应用的classpath下的hbase-site.xml
    public static Configuration configuration = HBaseConfiguration.create();

    public Test() throws Exception {
        // 当然也可以手动加载配置文件，手动加载配置文件时要调用configuration的addResource方法
        // configuration.addResource("hbase-site.xml");
        connection = ConnectionFactory.createConnection(configuration);
    }

    public void createTable(String tableName, String... cf1) throws Exception {
        Admin admin = connection.getAdmin();

        //HTD需要TableName类型的tableName，创建TableName类型的tableName
        TableName tbName = TableName.valueOf(tableName);
        //判断表述否已存在，不存在则创建表
        if (admin.tableExists(tbName)) {
            System.err.println("表" + tableName + "已存在！");
            return;
        }
        //通过HTableDescriptor创建一个HTableDescriptor将表的描述传到createTable参数中
        HTableDescriptor HTD = new HTableDescriptor(tbName);
        //为描述器添加表的详细参数
        for (String cf : cf1) {
            // 创建HColumnDescriptor对象添加表的详细的描述
            HColumnDescriptor HCD = new HColumnDescriptor(cf);
            HTD.addFamily(HCD);
        }
        //调用createtable方法创建表
        admin.createTable(HTD);
    }

    public void deleteTable(String tableName) throws Exception {
        Admin admin = connection.getAdmin();
        //通过tableName创建表名
        TableName tbName = TableName.valueOf(tableName);
        //判断表是否存在，若存在就删除，不存在就退出
        if (admin.tableExists(tbName)) {
            //首先将表解除占用，否则无法删除
            admin.disableTable(tbName);
            //调用delete方法
            admin.deleteTable(tbName);
            System.err.println("表" + tableName + "已删除");
        } else {
            System.err.println("表" + tableName + "不存在！");
        }
    }

    public void putData() throws Exception {
        //通过表名获取tbName
        TableName tbname = TableName.valueOf("t1");
        //通过connection获取相应的表
        Table table = connection.getTable(tbname);
        //创建Random对象以作为随机参数
        Random random = new Random();
        //hbase支持批量写入数据，创建Put集合来存放批量的数据
        List<Put> batput = new ArrayList<>();

        for (int i = 0; i < 10; i++) {
            //实例化put对象，传入行键
            Put put = new Put(Bytes.toBytes("rowkey_" + i));
            //调用addcolum方法，向f1列簇中添加字段
            put.addImmutable(Bytes.toBytes("f1"), Bytes.toBytes("username"), Bytes.toBytes("un_" + i));
            put.addImmutable(Bytes.toBytes("f1"), Bytes.toBytes("age"), Bytes.toBytes(random.nextInt(50) + 1));
            put.addImmutable(Bytes.toBytes("f1"), Bytes.toBytes("birthday"), Bytes.toBytes("2017" + i));
            put.addImmutable(Bytes.toBytes("f1"), Bytes.toBytes("phone"), Bytes.toBytes("phone:" + i));
            put.addImmutable(Bytes.toBytes("f1"), Bytes.toBytes("邮箱"), Bytes.toBytes("邮箱:" + i));
            //将测试数据添加到list中
            batput.add(put);
        }
        //调用put方法将list中的测试数据写入hbase
        table.put(batput);
        System.err.println("数据插入完成！");
    }

    public void getData() throws Exception {
        //获取想要查询的表的TableName
        TableName tbname = TableName.valueOf("t1");
        //通过tbName获得Table对象
        Table table = connection.getTable(tbname);
        //创建Get的集合以承接查询的条件
        List<Get> gets = new ArrayList<Get>();
        //循环五次，取前五个测试数据
        for (int i = 0; i < 5; i++) {
            //就将查询条件放入get对象中
            Get get = new Get(Bytes.toBytes("rowkey_" + i));
            //将get对象放入聚合
            gets.add(get);
        }
        //调用table.get方法传入查询条件，获得查询的结果的数组
        Result[] results = table.get(gets);
        //遍历结果数组，利用CellScanner配合cellUtil获得对应的数据
        for (Result result : results) {
            //调用result.cellscanner创建scanner对象
            CellScanner cellScanner = result.cellScanner();
            //遍历结果集，取出查询结果，
            //如果存在下一个cell则advandce方法返回true，且current方法会返回一个有效的cell，可以当作循环条件
            while (cellScanner.advance()) {
                //current方法返回一个有效的cell
                Cell cell = cellScanner.current();
                //使用CellUtil调用相应的方法获取想用的数据，并利用Bytes.toString方法将结果转换为string输出
                String family = Bytes.toString(CellUtil.cloneFamily(cell));
                String qualify = Bytes.toString(CellUtil.cloneQualifier(cell));
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.err.println(family + "_" + qualify + "_" + rowkey + "_" + value);
            }
        }
    }

    public void getData1() throws Exception {
        TableName tbname = TableName.valueOf("bd14:fromJava");
        Table table = connection.getTable(tbname);
        List<Get> gets = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            Get get = new Get(Bytes.toBytes("rowkey_" + i));
            gets.add(get);
        }
        Result[] results = table.get(gets);
        for (Result result : results) {
            NavigableMap<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> map = result.getMap();
            for (byte[] cf : map.keySet()) {
                NavigableMap<byte[], NavigableMap<Long, byte[]>> valueWithColumnQualify = map.get(cf);
                for (byte[] columnQualify : valueWithColumnQualify.keySet()) {
                    NavigableMap<Long, byte[]> valueWithTimestamp = valueWithColumnQualify.get(columnQualify);
                    for (Long ts : valueWithTimestamp.keySet()) {
                        byte[] value = valueWithTimestamp.get(ts);
                        String rowKey = Bytes.toString(result.getRow());
                        String columnFamily = Bytes.toString(cf);
                        String columnqualify = Bytes.toString(columnQualify);
                        String timestamp = new Date(ts) + "";
                        String values = Bytes.toString(columnQualify);
                        System.out.println(rowKey + "-" + columnFamily + "-" + columnqualify + "-" + timestamp + "-" + values);
                    }
                }
            }
        }
    }

    public void getData2() throws Exception {
        TableName tbname = TableName.valueOf("bd14:fromJava");
        Table table = connection.getTable(tbname);
        List<Get> gets = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            Get get = new Get(Bytes.toBytes("rowkey_" + i));
            gets.add(get);
        }
        Result[] results = table.get(gets);
        //遍历结果对象results
        for (Result result : results) {
            //嵌套遍历result获取cell
            for (Cell cell : result.listCells()) {
                //使用CellUtil工具类直接获取cell中的数据
                String family = Bytes.toString(CellUtil.cloneFamily(cell));
                String qualify = Bytes.toString(CellUtil.cloneQualifier(cell));
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.err.println(family + "_" + qualify + "_" + rowkey + "_" + value);
            }
        }

    }

    public void updateData(String tableName, String rowKey, String family, String columkey, String updatedata) throws Exception {
        //hbase中更新数据同样采用put方法，在相同的位置put数据，则在查询时只会返回时间戳较新的数据
        //且在文件合并时会将时间戳较旧的数据舍弃
        Put put = new Put(Bytes.toBytes(rowKey));
        //将新数据添加到put中
        put.addImmutable(Bytes.toBytes(family), Bytes.toBytes(columkey), Bytes.toBytes(updatedata));
        Table table = connection.getTable(TableName.valueOf(tableName));
        //将put写入HBase
        table.put(put);
    }

    //删除某条记录
    public void deleteData(String tableName,String rowKey,String family, String columkey) throws Exception{
        Table table = connection.getTable(TableName.valueOf(tableName));
        //创建delete对象
        Delete deletData= new Delete(Bytes.toBytes(rowKey));
        //将要删除的数据的准确坐标添加到对象中
        deletData.addColumn(Bytes.toBytes(family), Bytes.toBytes(columkey));
        //删除表中数据
        table.delete(deletData);
    }

    //删除一行数据
    public void deleteRow(String tableName,String rowKey) throws Exception{
        Table table = connection.getTable(TableName.valueOf(tableName));
        //通过行键删除一整行的数据
        Delete deletRow= new Delete(Bytes.toBytes(rowKey));
        table.delete(deletRow);
    }

    public static void main(String[] args) {
        try {
            Test test = new Test();
            test.createTable("t1", "f1");
//            test.putData();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}