HBase过滤器及其代码示例

HBase过滤器及其代码示例

目录

• HBase过滤器及其代码示例
  • • 作用
    • 比较过滤器
      • 操作符
      • 常见的六大比较器
        • BinaryComparator：二进制比较器
        • BinaryPrefixComparator：前缀二进制比较器
        • NullComparator
        • BitComparator
        • RegexStringComparator
        • SubstringComparator：字符串比较器
      • 示例代码
        • rowKey过滤器：RowFilter
        • 列簇名过滤器：FamilyFilter
        • 列名过滤器：QualifierFilter
        • 列值过滤器：ValueFilter
    • 专用过滤器
      • • 单列值过滤器：SingleColumnValueFilter
        • 列值排除过滤器：SingleColumnValueExcludeFilter
        • rowkey前缀过滤器：PrefixFilter
        • 分页过滤器PageFilter
    • 多过滤器综合查询

HBase 的基本 API，包括增、删、改、查等。

增、删都是相对简单的操作，与传统的 RDBMS 相比，这里的查询操作略显苍白，

只能根据特性的行键进行查询（Get）或者根据行键的范围来查询（Scan）。

HBase 不仅提供了这些简单的查询，而且提供了更加高级的过滤器Filter来查询。

作用

• 过滤器的作用是在服务端判断数据是否满足条件，然后只将满足条件的数据返回给客户端
• 过滤器的类型很多，但是可以分为两大类：
  • 比较过滤器：可应用于rowkey、列簇、列、列值过滤器
  • 专用过滤器：只能适用于特定的过滤器

• 使用过滤器至少需要两类参数：一类是操作符，另一类是比较器

比较过滤器

操作符

• LESS <

• LESS_OR_EQUAL <=

• EQUAL =

• NOT_EQUAL <>

• GREATER_OR_EQUAL >=

• GREATER >

• NO_OP 排除所有

常见的六大比较器

BinaryComparator：二进制比较器

按字节索引顺序比较指定字节数组，采用Bytes.compareTo(byte[])

BinaryPrefixComparator：前缀二进制比较器

通BinaryComparator，只是比较左端前缀的数据是否相同

NullComparator

判断给定的是否为空

BitComparator

按位比较

RegexStringComparator

提供一个正则的比较器，仅支持 EQUAL 和非EQUAL

SubstringComparator：字符串比较器

判断提供的子串是否出现在中

示例代码

rowKey过滤器：RowFilter

示例1

过滤出Rowkey(id)中 包含8的数据

 @Test
    public void RowFilterWithSubString() throws IOException {
        //使用SubstringComparator比较器，需要new一下
        SubstringComparator comparator = new SubstringComparator("8");

        //new一个rowKey过滤器的类RowFilter，参数需要传入操作符和比较器
        //此处操作符可以使用枚举操作符，比较器为SubstringComparator
        RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, comparator);
        printScanner(rowFilter);
    }

示例2

通过RowFilter与BinaryComparator过滤比rowKey 1500100010小的所有值出来

    @Test
    // 通过RowFilter过滤比rowKey 1500100010 小的所有值出来
    public void BinaryComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        BinaryComparator binaryComparator = new BinaryComparator(Bytes.toBytes(1500100010));
        RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.LESS, binaryComparator);
        Scan scan = new Scan();
        scan.setFilter(rowFilter);
        ResultScanner scanner = students.getScanner(scan);
        Result rs = scanner.next();
        while (rs != null) {
            String id = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            int age = Bytes.toInt(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));

            System.out.println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + clazz + "\t");

            rs = scanner.next();
        }
    }

列簇名过滤器：FamilyFilter

过滤出列簇名为cf2下的所有列的数据

 @Test
    public void FamilyFilterWithCom() throws IOException {
        Scan scan = new Scan();//过滤后肯定是一批数据，需要new一个Scan()

        //使用BinaryComparator比较器，需要new一下（参数需要传入字节数组，就得转化一下）
        BinaryComparator binaryComparator = new BinaryComparator("cf2".getBytes());
        
    //使用列簇名过滤器，需要new一个列簇名过滤器的类FamilyFilter，参数需要传入操作符和比较器
        FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL,binaryComparator);

        //把列簇过滤器传进去
        scan.setFilter(familyFilter);

        //想要用test2表，此处就需要获取一下
        Table test2 = conn.getTable(TableName.valueOf("test2"));

        //调用getScanner()方法，返回的是结果的集合
        ResultScanner sc = test2.getScanner(scan);
        //遍历集合
        for (Result rs : sc) {
            for (Cell cell : rs.listCells()) {
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.out.println(rowkey + "," + value);
            }
        }
    }

通过FamilyFilter与SubstringComparator查询列簇名包含in的所有列簇下面的数据

    @Test
    // 通过FamilyFilter查询列簇名包含in的所有列簇下面的数据
    public void SubstringComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        SubstringComparator substringComparator = new SubstringComparator("in");
        FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, substringComparator);
        Scan scan = new Scan();
        scan.setFilter(familyFilter);
        ResultScanner scanner = students.getScanner(scan);
        Result rs = scanner.next();
        while (rs != null) {
            String id = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            int age = Bytes.toInt(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));

            System.out.println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + clazz + "\t");

            rs = scanner.next();
        }
    }

通过FamilyFilter与 BinaryPrefixComparator 过滤出列簇以info开头的列簇下的所有数据

// 通过FamilyFilter与 BinaryPrefixComparator 过滤出列簇以info开头的所有列簇下的所有数据
    @Test
    public void BinaryPrefixComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));

        // 二进制前缀比较器
        BinaryPrefixComparator binaryPrefixComparator = new BinaryPrefixComparator("info".getBytes());
        // FamilyFilter 作用于列簇的过滤器
        FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, binaryPrefixComparator);

        Scan scan = new Scan();

        scan.withStartRow("1500100001".getBytes());
        scan.withStopRow("1500100011".getBytes());
        // 通过setFilter方法设置过滤器
        scan.setFilter(familyFilter);

        ResultScanner scanner = students.getScanner(scan);

        printRS(scanner);
    }

列名过滤器：QualifierFilter

通过QualifierFilter与SubstringComparator查询列名包含in的列的值

    public void printRS(ResultScanner scanner) throws IOException {
        for (Result rs : scanner) {
            String rowkey = Bytes.toString(rs.getRow());
            System.out.println("当前行的rowkey为：" + rowkey);
            for (Cell cell : rs.listCells()) {
                String family = Bytes.toString(CellUtil.cloneFamily(cell));
                String qualifier = Bytes.toString(CellUtil.cloneQualifier(cell));
                byte[] bytes = CellUtil.cloneValue(cell);
                if ("age".equals(qualifier)) {
                    int value = Bytes.toInt(bytes);
                    System.out.println(family + ":" + qualifier + "的值为" + value);
                } else {
                    String value = Bytes.toString(bytes);
                    System.out.println(family + ":" + qualifier + "的值为" + value);
                }
            }
        }
    }

    @Test
    // 通过FamilyFilter查询列簇名包含in的所有列簇下面的数据
    public void SubstringComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        SubstringComparator substringComparator = new SubstringComparator("in");
        FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, substringComparator);
        Scan scan = new Scan();
        scan.setFilter(familyFilter);
        ResultScanner scanner = students.getScanner(scan);
        Result rs = scanner.next();
        while (rs != null) {
            String id = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            int age = Bytes.toInt(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));

            System.out.println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + clazz + "\t");

            rs = scanner.next();
        }

    }

过滤出 列的名字 中 包含 "am" 所有的列 及列的值

    // 过滤出 列的名字 中 包含 "am" 所有的列 及列的值
    @Test
    public void SubstringComparatorQualifierFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));

        SubstringComparator substringComparator = new SubstringComparator("am");
        // 作用在列名上的过滤器
        QualifierFilter qualifierFilter = new QualifierFilter(CompareFilter.CompareOp.EQUAL, substringComparator);
        Scan scan = new Scan();

        scan.withStartRow("1500100001".getBytes());
        scan.withStopRow("1500100011".getBytes());
        // 通过setFilter方法设置过滤器
        scan.setFilter(qualifierFilter);

        ResultScanner scanner = students.getScanner(scan);

        printRS(scanner);

    }

列值过滤器：ValueFilter

通过ValueFilter与BinaryPrefixComparator过滤出所有的cell中值以 "张" 开头的学生

    @Test
    // 通过ValueFilter与BinaryPrefixComparator过滤出所有的cell中值以 "张" 开头的学生
    public void BinaryPrefixComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        BinaryPrefixComparator binaryPrefixComparator = new BinaryPrefixComparator("张".getBytes());
        ValueFilter valueFilter = new ValueFilter(CompareFilter.CompareOp.EQUAL, binaryPrefixComparator);
        Scan scan = new Scan();
        scan.setFilter(valueFilter);
        ResultScanner scanner = students.getScanner(scan);

        printRS(scanner);

    }

过滤出文科的学生，只会返回clazz列，其他列的数据不符合条件，不会返回

    // 过滤出文科的学生
    // 只会返回clazz列，其他列的数据不符合条件，不会返回
    @Test
    public void RegexStringComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));

        // 使用正则表达式比较器
        RegexStringComparator regexStringComparator = new RegexStringComparator("^文科.*");
        // ValueFilter 会返回符合条件的cell，并不会返回整条数据
        ValueFilter valueFilter = new ValueFilter(CompareFilter.CompareOp.EQUAL, regexStringComparator);

        Scan scan = new Scan();

        scan.withStartRow("1500100001".getBytes());
        scan.withStopRow("1500100011".getBytes());
        // 通过setFilter方法设置过滤器
        scan.setFilter(valueFilter);

        ResultScanner scanner = students.getScanner(scan);

        printRS(scanner);
    }

专用过滤器

单列值过滤器：SingleColumnValueFilter

SingleColumnValueFilter会返回满足条件的cell所在行的所有cell的值（即会返回一行数据）

通过SingleColumnValueFilter与查询文科班所有学生信息

    @Test
    // 通过SingleColumnValueFilter与查询文科班所有学生信息
    public void RegexStringComparatorFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        SingleColumnValueFilter singleColumnValueFilter = new SingleColumnValueFilter(
                "info".getBytes(),
                "clazz".getBytes(),
                CompareFilter.CompareOp.EQUAL,
                new RegexStringComparator("^文科.*")
        );

        Scan scan = new Scan();
        scan.setFilter(singleColumnValueFilter);
        ResultScanner scanner = students.getScanner(scan);

        Result rs = scanner.next();
        while (rs != null) {
            String id = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            int age = Bytes.toInt(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));

            System.out.println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + clazz + "\t");

            rs = scanner.next();
        }

    }

列值排除过滤器：SingleColumnValueExcludeFilter

与SingleColumnValueFilter相反，会排除掉指定的列，其他的列全部返回

通过SingleColumnValueExcludeFilter与BinaryComparator查询文科一班所有学生信息，最终不返回clazz列

    @Test
    // 通过SingleColumnValueExcludeFilter与BinaryComparator查询文科一班所有学生信息，最终不返回clazz列
    public void RegexStringComparatorExcludeFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        SingleColumnValueExcludeFilter singleColumnValueExcludeFilter = new SingleColumnValueExcludeFilter(
                "info".getBytes(),
                "clazz".getBytes(),
                CompareFilter.CompareOp.EQUAL,
                new BinaryComparator("文科一班".getBytes())
        );

        Scan scan = new Scan();
        scan.setFilter(singleColumnValueExcludeFilter);
        ResultScanner scanner = students.getScanner(scan);

        Result rs = scanner.next();
        while (rs != null) {
            String id = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            int age = Bytes.toInt(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            // clazz列为空
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));

            System.out.println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + clazz + "\t");

            rs = scanner.next();
        }

    }

rowkey前缀过滤器：PrefixFilter

通过PrefixFilter查询以150010008开头的所有前缀的rowkey

    @Test
    // 通过PrefixFilter查询以150010008开头的所有前缀的rowkey
    public void PrefixFilterFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        PrefixFilter prefixFilter = new PrefixFilter("150010008".getBytes());
        Scan scan = new Scan();
        scan.setFilter(prefixFilter);
        ResultScanner scanner = students.getScanner(scan);
        Result rs = scanner.next();
        while (rs != null) {
            String id = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            int age = Bytes.toInt(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            // clazz列为空
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));

            System.out.println(id + "\t" + name + "\t" + age + "\t" + gender + "\t" + clazz + "\t");

            rs = scanner.next();
        }
    }

分页过滤器PageFilter

通过PageFilter查询第三页的数据，每页10条

使用PageFilter分页效率比较低，每次都需要扫描前面的数据，直到扫描到所需要查的数据

可设计一个合理的rowkey来实现分页需求

    @Test
    // 通过PageFilter查询第三页的数据，每页10条
    public void PageFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        int PageNum = 3;
        int PageSize = 10;
        Scan scan = new Scan();
        if (PageNum == 1) {
            scan.withStartRow("".getBytes());
            //使用分页过滤器，实现数据的分页
            PageFilter pageFilter = new PageFilter(PageSize);
            scan.setFilter(pageFilter);
            ResultScanner scanner = students.getScanner(scan);
            printRS(scanner);
        } else {
            String current_page_start_rows = "";
            int scanDatas = (PageNum - 1) * PageSize + 1;
            PageFilter pageFilter = new PageFilter(scanDatas);
            scan.setFilter(pageFilter);
            ResultScanner scanner = students.getScanner(scan);
            for (Result rs : scanner) {
                current_page_start_rows = Bytes.toString(rs.getRow());
            }
            scan.withStartRow(current_page_start_rows.getBytes());
            PageFilter pageFilter1 = new PageFilter(PageSize);
            scan.setFilter(pageFilter1);
            ResultScanner scanner1 = students.getScanner(scan);
            printRS(scanner1);

        }

    }

通过合理的设置rowkey来实现分页功能

    @Test
    // 通过合理的设置rowkey来实现分页功能，提高效率
    public void PageFilterTest2() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        int PageSize = 10;
        int PageNum = 3;

        int baseId = 1500100000;
        int start_row = baseId + (PageNum - 1) * PageSize + 1;
        int end_row = start_row + PageSize;
        Scan scan = new Scan();
        scan.withStartRow(String.valueOf(start_row).getBytes());
        scan.withStopRow(String.valueOf(end_row).getBytes());

        ResultScanner scanner = students.getScanner(scan);

        printRS(scanner);


    }

多过滤器综合查询

查询文科班中的学生中学号以150010008开头并且年龄小于23的学生信息

    @Test
    // 查询文科班中的学生中学号以150010008开头并且年龄小于23的学生信息
    public void FilterListFilter() throws IOException {
        Table students = conn.getTable(TableName.valueOf("students"));
        Scan scan = new Scan();
        SingleColumnValueFilter singleColumnValueFilter = new SingleColumnValueFilter(
                "info".getBytes()
                , "clazz".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , new RegexStringComparator("^文科.*"));
        PrefixFilter prefixFilter = new PrefixFilter("150010008".getBytes());
        SingleColumnValueFilter singleColumnValueFilter1 = new SingleColumnValueFilter(
                "info".getBytes()
                , "age".getBytes()
                , CompareFilter.CompareOp.LESS
                , new BinaryComparator(Bytes.toBytes(23)));

        FilterList filterList = new FilterList();
        filterList.addFilter(singleColumnValueFilter);
        filterList.addFilter(prefixFilter);
        filterList.addFilter(singleColumnValueFilter1);
        scan.setFilter(filterList);
        ResultScanner scanner = students.getScanner(scan);
        printRS(scanner);

    }

程序示例总结

package com.shujia;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.*;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;

public class Demo04Filter {
    Connection conn;//创建全局变量
    Table stu;

    public ResultScanner getScannerWithFilter(Filter filter) throws IOException {
        Scan scan = new Scan();
        scan.setFilter(filter);
        return stu.getScanner(scan);
    }

    public void printScanner(Filter filter) throws IOException {
        for (Result rs : getScannerWithFilter(filter)) {
            String rk = Bytes.toString(rs.getRow());
            String name = Bytes.toString(rs.getValue("info".getBytes(), "name".getBytes()));
            String age = Bytes.toString(rs.getValue("info".getBytes(), "age".getBytes()));
            String gender = Bytes.toString(rs.getValue("info".getBytes(), "gender".getBytes()));
            String clazz = Bytes.toString(rs.getValue("info".getBytes(), "clazz".getBytes()));
            System.out.println(rk + "," + name + "," + age + "," + gender + "," + clazz);
        }
    }

    //使用CellUtil进行打印
    public void printScannerWithCellUtil(Filter filter) throws IOException {
        for (Result rs : getScannerWithFilter(filter)) {
            for (Cell cell : rs.listCells()) {
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.out.println(rowkey + "," + value);
            }
        }
    }

    @Before
    public void init() throws IOException {
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "master:2181,node1:2181,node2:2181");
        conn = ConnectionFactory.createConnection(conf);

        stu = conn.getTable(TableName.valueOf("stu"));
    }

    @Test
    // 过滤出Rowkey(id)中包含8的数据
    public void RowFilterWithSubString() throws IOException {
        Scan scan = new Scan();//过滤肯定是一批数据，需要new一个Scan()

        //使用SubstringComparator比较器，需要new一下
        SubstringComparator comparator = new SubstringComparator("8");

        //使用rowkey过滤器，需要new一个rowKey过滤器的类RowFilter，参数需要传入操作符和比较器
        //此处操作符可以使用枚举操作符，比较器为SubstringComparator
        RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL, comparator);
        printScanner(rowFilter);
    }

    @Test
    // 过滤出列簇名为cf2下的所有列的数据
    public void FamilyFilterWithCom() throws IOException {
        Scan scan = new Scan();//过滤后肯定是一批数据，需要new一个Scan()

        //使用BinaryComparator比较器，需要new一下（参数需要传入字节数组，就得转化一下）
        BinaryComparator binaryComparator = new BinaryComparator("cf2".getBytes());
        //使用列簇名过滤器，需要new一个列簇名过滤器的类FamilyFilter，参数需要传入操作符和比较器
        FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL,binaryComparator);

        //把列簇过滤器传进去
        scan.setFilter(familyFilter);

        //想要用test2表，此处就需要获取一下
        Table test2 = conn.getTable(TableName.valueOf("test2"));

        //调用getScanner()方法，返回的是结果的集合
        ResultScanner sc = test2.getScanner(scan);
        //遍历集合
        for (Result rs : sc) {
            for (Cell cell : rs.listCells()) {
                String rowkey = Bytes.toString(CellUtil.cloneRow(cell));
                String value = Bytes.toString(CellUtil.cloneValue(cell));
                System.out.println(rowkey + "," + value);
            }
        }
    }

    @Test
    // stu表中列名包含a的所有的列的数据，使用正则比较器
    public void QualifierFilterWithRegex() throws IOException {
        QualifierFilter qualifierFilter = new QualifierFilter(CompareFilter.CompareOp.EQUAL,
                new RegexStringComparator(".*a.*"));

        printScannerWithCellUtil(qualifierFilter);
    }

    @Test
    // 过滤出 数据中包含 文 的所有数据
    public void ValueFilterWithSubString() throws IOException {
        ValueFilter valueFilter = new ValueFilter(CompareFilter.CompareOp.EQUAL,
                new SubstringComparator("文"));

        printScannerWithCellUtil(valueFilter);
    }

    @Test
    // 过滤出班级是 文科班 的学生的所有信息
    public void SingleColumnValueFilterWithBinaryPrefix() throws IOException {
        SingleColumnValueFilter singleColumnValueFilter = new SingleColumnValueFilter("info".getBytes()
                , "clazz".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , new BinaryPrefixComparator("文科".getBytes()));

        printScanner(singleColumnValueFilter);
    }

    @Test
    // 过滤出班级是 文科班 的学生的所有信息，最终结果没有 clazz 列
    public void SingleColumnValueExcludeFilterWithBinaryPrefix() throws IOException {
        SingleColumnValueExcludeFilter singleColumnValueExcludeFilter = new SingleColumnValueExcludeFilter("info".getBytes()
                , "clazz".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , new BinaryPrefixComparator("文科".getBytes()));

        printScanner(singleColumnValueExcludeFilter);
    }

    @Test
    // 过滤出年龄是 奇数 的学生的所有信息
    public void SingleColumnValueFilterWithRegex() throws IOException {
        SingleColumnValueFilter singleColumnValueFilter = new SingleColumnValueFilter("info".getBytes()
                , "age".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , new RegexStringComparator("^[0-9]{0,1}[13579]$"));

        printScanner(singleColumnValueFilter);
    }

    @Test
    // 查询以150010008开头的所有前缀的rowkey
    public void PrefixFilter() throws IOException {
        // 第一种方式
        PrefixFilter prefixFilter = new PrefixFilter("150010008".getBytes());

        printScanner(prefixFilter);

        System.out.println("**********************************");
        // 第二种方式
        RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL,
                new BinaryPrefixComparator("150010008".getBytes()));

        printScanner(rowFilter);

    }

    @Test
    // 过滤出 理科班 中的 女生 年龄为奇数 的学生的所有信息
    public void CombineFilter() throws IOException {
        SingleColumnValueFilter filter1 = new SingleColumnValueFilter("info".getBytes()
                , "clazz".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , new BinaryPrefixComparator("理科".getBytes()));

        SingleColumnValueExcludeFilter filter2 = new SingleColumnValueExcludeFilter("info".getBytes()
                , "gender".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , "女".getBytes());

        SingleColumnValueFilter filter3 = new SingleColumnValueFilter("info".getBytes()
                , "age".getBytes()
                , CompareFilter.CompareOp.EQUAL
                , new RegexStringComparator("^[0-9]{0,1}[13579]$"));

        /**
         * MUST_PASS_ALL ===>  and
         * MUST_PASS_ONE ===>  or
         */
        FilterList filterList = new FilterList(FilterList.Operator.MUST_PASS_ONE);
        filterList.addFilter(filter1);
        filterList.addFilter(filter2);
        filterList.addFilter(filter3);

        printScanner(filterList);
    }

    @After
    public void close() throws IOException {
        conn.close();
    }
}

标签：scan,String,rs,示例,Bytes,过滤器,new,HBase,getBytes
来源： https://www.cnblogs.com/saowei/p/15952805.html