hbase scan的java操作

public class HbaseTest {
    public static void main(String[] args) throws Exception {
        //构建基本信息
        String table = "t_userBehavior2";
        final TableName tableName = TableName.valueOf(table);
        final HTable hTable = new HTable(tableName, HBaseUtil.getConnection());
        final Scan scan = new Scan();

        //查询出小于某个rk的全部数据
        System.out.println("小于等于DD4400000047344000007497818085B0的行");
        Filter filter1 = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL,
                new BinaryComparator("DD4400000047344000007497818085B0".getBytes()));
        scan.setFilter(filter1);
        ResultScanner scanner1 = hTable.getScanner(scan);
        for (Result res : scanner1) {
            System.out.println(res);
        }
        scanner1.close();
        System.out.println("--------------------------------------------------------------------");

        //正则匹配rk
        System.out.println("正则获取结尾为85B0的行");
        final RowFilter filter2 = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator(".*85B0"));
        scan.setFilter(filter2);
        final ResultScanner scanner2 = hTable.getScanner(scan);
        for (Result res : scanner2) {
            System.out.println(res);
        }
        scanner2.close();
        System.out.println("--------------------------------------------------------------------");

        //rk包含某些字符串的所有行
        System.out.println("包含有DD4400000047的行");
        Filter filter3 = new RowFilter(CompareFilter.CompareOp.EQUAL,
                new SubstringComparator("DD4400000047"));
        scan.setFilter(filter3);
        ResultScanner scanner3 = hTable.getScanner(scan);
        for (Result res : scanner3) {
            System.out.println(res);
        }
        scanner3.close();
        System.out.println("--------------------------------------------------------------------");

        //判断rk的开头信息的所有行
        System.out.println("开头是DD4400的");
        Filter filter4 = new RowFilter(CompareFilter.CompareOp.EQUAL,
                new BinaryPrefixComparator("DD4400".getBytes()));
        scan.setFilter(filter4);
        ResultScanner scanner4 = hTable.getScanner(scan);
        for (Result res : scanner4) {
            System.out.println(res);
        }
        scanner3.close();
        System.out.println("----------------------------------------------------");

/***

 RowFilter用于过滤row key，过滤的条件如下:
 Operator   Description
 LESS   小于
 LESS_OR_EQUAL  小于等于
 EQUAL  等于
 NOT_EQUAL  不等于
 GREATER_OR_EQUAL   大于等于
 GREATER    大于
 NO_OP  排除所有







 Comparator Description比较器:
 BinaryComparator   使用Bytes.compareTo()比较
 BinaryPrefixComparator 和BinaryComparator差不多，从前面开始比较
 NullComparator Does not compare against an actual value but whether a given one is null, or not  null.
 BitComparator  Performs a bitwise comparison, providing a BitwiseOp class with OR, and XORoperators.
 RegexStringComparator  正则表达式
 SubstringComparator    把数据当成字符串，用contains()来判断
 *scan.setFilter(new PrefixFilter(rowPrifix.getBytes()));根据rk的前缀来进行过滤出所有的行
 *设定限制范围，查询出该范围内的所有行

 scan.setStartRow(getBytes(startRow));

 scan.setStopRow(getBytes(stopRow));
 */
        scan.setStartRow(Bytes.toBytes("000000000"));


//        scan.setStopRow(Bytes.toBytes("235959999"));
//        scan.setFilter(new PrefixFilter(rowPrifix.getBytes()));
        ResultScanner rs = hTable.getScanner(scan);
        for (Result r : rs) {
            KeyValue[] kv = r.raw();
            for (int i = 0; i < kv.length; i++) {
                final String rk = new String(kv[i].getRow());
                final Result resut = HBaseUtil.getRow(table, rk.getBytes());
                final List cellList = resut.listCells();
                for (Cell cell : cellList) {
                    final String value = new String(cell.getValue());
                    System.out.println(value);
                }
                System.out.print(new String(kv[i].getRow()) + "  ");
                System.out.print(new String(kv[i].getFamily()) + ":");
                System.out.print(new String(kv[i].getQualifier()) + "  ");
                System.out.print(kv[i].getTimestamp() + "  ");
                System.out.println(new String(kv[i].getValue()));
            }
        }
    }

}

作者：会飞的蜗牛66666
        链接：https://www.jianshu.com/p/1da9fe1b2afe
        来源：简书
        简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。