Using HBase in java

Create a HBaseConfiguration object to connect to a HBase server. You need to tell configuration object that where to read the HBase configuration from. to do this add a resource to the HBaseConfiguration object.
    
    HBaseConfiguration conf = new HBaseConfiguration();
    conf.addResource(new Path("/opt/hbase-0.19.3/conf/hbase-site.xml"));

Create a HTable object to a table in HBase. HTable object connects you to a table in HBase.

    HTable table = new HTable(conf, "test_table");

Create a BatchUpdate object on a row to perform update operations (like put and delete)

    BatchUpdate batchUpdate = new BatchUpdate("test_row1");
    batchUpdate.put("columnfamily:column1", Bytes.toBytes("some value"));
    batchUpdate.delete("column1");

Commit the changes to table using HTable#commit() method.

    table.commit(batchUpdate);

To read one column value from a row use HTable#get() method.

    Cell cell = table.get("test_row1", "columnfamily1:column1");
    if (cell != null) {
        String valueStr = Bytes.toString(cell.getValue());
        System.out.println("test_row1:columnfamily1:column1 " + valueStr);
    }

To read one row with given columns, use HTable#getRow() method.
 
    RowResult singleRow = table.getRow(Bytes.toBytes("test_row1"));
    Cell cell = singleRow.get(Bytes.toBytes("columnfamily1:column1"));
    if(cell!=null) {
        System.out.println(Bytes.toString(cell.getValue()));
    }

    cell = singleRow.get(Bytes.toBytes("columnfamily1:column2"));
    if(cell!=null) {
        System.out.println(Bytes.toString(cell.getValue()));
    }

To get multiple rows use Scanner and iterate throw to get values.

    Scanner scanner = table.getScanner(
        new String[] { "columnfamily1:column1" });

    //First aproach to iterate the scanner.
    RowResult rowResult = scanner.next();
    while (rowResult != null) {
        System.out.println("Found row: " + Bytes.toString(rowResult.getRow())
            + " with value: " +
            rowResult.get(Bytes.toBytes("columnfamily1:column1")));
        rowResult = scanner.next();
    }

    // The other approach is to use a foreach loop. Scanners are iterable!
    for (RowResult result : scanner) {
        System.out.println("Found row: " + Bytes.toString(result.getRow())
            + " with value: " +
            result.get(Bytes.toBytes("columnfamily1:column1")));
    }

    scanner.close();