package cn.itcast.hbase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.*;
import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.filter.FilterList.Operator;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.theories.suppliers.TestedOn;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
//todo:Hbase Api操作
public class HbaseDemo {
//初始化Configuration对象
private Configuration conf = null;
//初始化链接
private Connection conn = null;
@Before
public void init() throws Exception {
conf = HBaseConfiguration.create();
// 对于hbase的客户端来说，只需要知道hbase所使用的zookeeper集群地址就可以了
// 因为hbase的客户端找hbase读写数据完全不用经过hmaster
conf.set("hbase.zookeeper.quorum", "bigdata-01:2181,bigdata-02:2181,bigdata-03:2181");
//获取链接
conn = ConnectionFactory.createConnection(conf);
}
/**
* 建表
*
* @throws Exception hbase shell------> create 'tableName','列族1'，'列族2'
*/
@Test
public void createTable() throws Exception {
//获取一个表的管理器
Admin admin = conn.getAdmin();
//构造一个表描述器，并指定表名
HTableDescriptor tableDescriptor = new HTableDescriptor(TableName.valueOf("t_user_info".getBytes()));
//构造一个列族描述器，并指定列族名
HColumnDescriptor hcd1 = new HColumnDescriptor("base_info");
// 构造第二个列族描述器，并指定列族名
HColumnDescriptor hcd2 = new HColumnDescriptor("extra_info");
// 为该列族设定一个版本数量
hcd2.setVersions(1, 3);
// 将列族描述器添加到表描述器中
tableDescriptor.addFamily(hcd1).addFamily(hcd2);
//利用表的管理器创建表
admin.createTable(tableDescriptor);
//关闭
admin.close();
conn.close();
}
/**
* 修改表
*
* @throws Exception
*/ //hbase shell alter 't_user_info' ,'base_info',
@Test
public void modifyTable() throws Exception {
//获取一个表的管理器
Admin admin = conn.getAdmin();
//获取表的描述器
HTableDescriptor tableDescriptor = admin.getTableDescriptor(TableName.valueOf("t_user_info"));
//修改已有的ColumnFamily---extra_info最小版本数和最大版本数
HColumnDescriptor hcd1 = tableDescriptor.getFamily("extra_info".getBytes());
hcd1.setVersions(2, 5);
// 添加新的ColumnFamily
tableDescriptor.addFamily(new HColumnDescriptor("other_info"));
//表的管理器admin 修改表
admin.modifyTable(TableName.valueOf("t_user_info"), tableDescriptor);
//关闭
admin.close();
conn.close();
}
/**
* put添加数据
*
* @throws Exception hbase shell put 't_user_info','rk00001','base_info:name','lisi'
*/
@Test
public void testPut() throws Exception {
//构建一个 table对象，通过table对象来添加数据
Table table = conn.getTable(TableName.valueOf("t_user_info"));
//创建一个集合，用于存放Put对象
ArrayList<Put> puts = new ArrayList<Put>();
// 构建一个put对象（kv），指定其行键 例如hbase shell: put '表名','rowkey','列族:列名称','值'
Put put01 = new Put(Bytes.toBytes("user001")); //"user001".getBytes()
put01.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhangsan"));
Put put02 = new Put("user001".getBytes());
put02.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("password"), Bytes.toBytes("123456"));
Put put03 = new Put("user002".getBytes());
put03.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("lisi"));
put03.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false"));
Put put04 = new Put("zhang_sh_01".getBytes());
put04.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang01"));
put04.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false"));
Put put05 = new Put("zhang_sh_02".getBytes());
put05.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang02"));
put05.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false"));
Put put06 = new Put("liu_sh_01".getBytes());
put06.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("liu01"));
put06.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false"));
Put put07 = new Put("zhang_bj_01".getBytes());
put07.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang03"));
put07.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false"));
Put put08 = new Put("zhang_bj_01".getBytes());
put08.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang04"));
put08.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false"));
//把所有的put对象添加到一个集合中
puts.add(put01);
puts.add(put02);
puts.add(put03);
puts.add(put04);
puts.add(put05);
puts.add(put06);
puts.add(put07);
puts.add(put08);
//一起提交所有的记录
table.put(puts);
table.close();
conn.close();
}
/**
* 读取数据 get：一次读一行
*
* @throws Exception hbase shell : get 't_user_info',"rowkey"
*/
@Test
public void testGet() throws Exception {
//获取一个table对象
Table table = conn.getTable(TableName.valueOf("t_user_info"));
// 构造一个get查询参数对象，指定要get的是哪一行
Get get = new Get("user001".getBytes());
//返回查询结果数据
Result result = table.get(get);
//获取结果中的所有cell
List<Cell> cells = result.listCells();
//遍历所有的cell
for (Cell c : cells) {
//获取行键
byte[] rowArray = c.getRowArray(); //00001
//获取列族
byte[] familyArray = c.getFamilyArray(); //base_info
//获取列族下的列名称
byte[] qualifierArray = c.getQualifierArray();//username
//列字段的值
byte[] valueArray = c.getValueArray(); // zhangsan
//打印rowArray、familyArray、qualifierArray、valueArray
// System.out.println(new String(rowArray));
// System.out.println(new String(familyArray));
// System.out.println(new String(qualifierArray));
// System.out.println(new String(valueArray));
//按指定位置截取，获取rowArray、familyArray、qualifierArray、valueArray
System.out.print(new String(rowArray, c.getRowOffset(), c.getRowLength()));
System.out.print(" " + new String(familyArray, c.getFamilyOffset(), c.getFamilyLength()));
System.out.print(":" + new String(qualifierArray, c.getQualifierOffset(), c.getQualifierLength()));
System.out.println(" " + new String(valueArray, c.getValueOffset(), c.getValueLength()));
}
//关闭
table.close();
conn.close();
}
/**
* scan 批量查询数据
*
* @throws Exception hbase shell scan 't_user_info'
*/
@Test
public void testScan() throws Exception {
//获取table对象
Table table = conn.getTable(TableName.valueOf("t_user_info"));
//获取scan对象
Scan scan = new Scan();
//获取查询的数据
ResultScanner scanner = table.getScanner(scan);
//获取ResultScanner所有数据，返回迭代器
Iterator<Result> iter = scanner.iterator();
//遍历迭代器
while (iter.hasNext()) {
//获取当前每一行结果数据
Result result = iter.next();
//获取当前每一行中所有的cell对象
List<Cell> cells = result.listCells();
//迭代所有的cell
for (Cell c : cells) {
//获取行键
byte[] rowArray = c.getRowArray();
//获取列族
byte[] familyArray = c.getFamilyArray();
//获取列族下的列名称
byte[] qualifierArray = c.getQualifierArray();
//列字段的值
byte[] valueArray = c.getValueArray();
//打印rowArray、familyArray、qualifierArray、valueArray
System.out.println(new String(rowArray, c.getRowOffset(), c.getRowLength()));
System.out.print(new String(familyArray, c.getFamilyOffset(), c.getFamilyLength()));
System.out.print(":" + new String(qualifierArray, c.getQualifierOffset(), c.getQualifierLength()));
System.out.println(" " + new String(valueArray, c.getValueOffset(), c.getValueLength()));
}
System.out.println("-----------------------");
}
//关闭
table.close();
conn.close();
}
/**
* 删除表中的列数据
*
* @throws Exception hbase shell delete 't_user_info','user001','base_info:password'
*/
@Test
public void testDel() throws Exception {
//获取table对象
Table table = conn.getTable(TableName.valueOf("t_user_info"));
//获取delete对象,需要一个rowkey
Delete delete = new Delete("user001".getBytes());
//在delete对象中指定要删除的列族-列名称
delete.addColumn("base_info".getBytes(), "password".getBytes());
//执行删除操作
table.delete(delete);
//关闭
table.close();
conn.close();
}
/**
* 删除表
*
* @throws Exception hbase shell disable 't_user_info' drop 't_user_info'
*/
@Test
public void testDrop() throws Exception {
//获取一个表的管理器
Admin admin = conn.getAdmin();
//删除表时先需要disable，将表置为不可用，然后在delete
admin.disableTable(TableName.valueOf("t_user_info"));
admin.deleteTable(TableName.valueOf("t_user_info"));
admin.close();
conn.close();
}
/**
* 过滤器使用
*
* @throws Exception
*/
@Test
public void testFilter() throws Exception {
// 针对行键的前缀过滤器
// Filter pf = new PrefixFilter(Bytes.toBytes("liu"));//"liu".getBytes()
// testScan(pf);
// 行过滤器 需要一个比较运算符和比较器
// RowFilter rf1 = new RowFilter(CompareOp.LESS, new BinaryComparator(Bytes.toBytes("user002")));
// testScan(rf1);
//
// RowFilter rf2 = new RowFilter(CompareOp.EQUAL, new SubstringComparator("01"));//rowkey包含"01"子串的
// testScan(rf2);
//针对指定一个列的value的比较器来过滤
// ByteArrayComparable comparator1 = new RegexStringComparator("^zhang"); //以zhang开头的
// ByteArrayComparable comparator2 = new SubstringComparator("si"); //包含"si"子串
// SingleColumnValueFilter scvf = new SingleColumnValueFilter("base_info".getBytes(), "username".getBytes(), CompareOp.EQUAL, comparator1);
// testScan(scvf);
//针对列族名的过滤器 返回结果中只会包含满足条件的列族中的数据
// FamilyFilter ff1 = new FamilyFilter(CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("base_info")));
// FamilyFilter ff2 = new FamilyFilter(CompareOp.EQUAL, new BinaryPrefixComparator(Bytes.toBytes("base")));
// testScan(ff2);
//针对列名的过滤器 返回结果中只会包含满足条件的列的数据
// QualifierFilter qf1 = new QualifierFilter(CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("password")));
// QualifierFilter qf2 = new QualifierFilter(CompareOp.EQUAL, new BinaryPrefixComparator(Bytes.toBytes("user")));
// testScan(qf1);
//多个过滤器同时使用 select * from t1 where id >10 and age <30
FamilyFilter ff2 = new FamilyFilter(CompareOp.EQUAL, new BinaryPrefixComparator(Bytes.toBytes("base")));
ColumnPrefixFilter cf = new ColumnPrefixFilter("password".getBytes());
FilterList filterList = new FilterList(Operator.MUST_PASS_ALL);
filterList.addFilter(ff2);
filterList.addFilter(cf);
testScan(filterList);
}
//定义一个方法，接受一个过滤器，返回结果数据
public void testScan(Filter filter) throws Exception {
Table table = conn.getTable(TableName.valueOf("t_user_info"));
Scan scan = new Scan();
//设置过滤器
scan.setFilter(filter);
ResultScanner scanner = table.getScanner(scan);
Iterator<Result> iter = scanner.iterator();
//遍历所有的Result对象，获取结果
while (iter.hasNext()) {
Result result = iter.next();
CellScanner cellScanner = result.cellScanner();
while (cellScanner.advance()) {
Cell current = cellScanner.current();
byte[] rowArray = current.getRowArray();
byte[] familyArray = current.getFamilyArray();
byte[] valueArray = current.getValueArray();
byte[] qualifierArray = current.getQualifierArray();
//打印结果
System.out.println(new String(rowArray, current.getRowOffset(), current.getRowLength()));
System.out.print(new String(familyArray, current.getFamilyOffset(), current.getFamilyLength()));
System.out.print(":" + new String(qualifierArray, current.getQualifierOffset(), current.getQualifierLength()));
System.out.println(" " + new String(valueArray, current.getValueOffset(), current.getValueLength()));
}
System.out.println("-----------------------");
}
}
}
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>1.2.1</version>
</dependency>
</dependencies>
来源：oschina
链接：https://my.oschina.net/u/4281177/blog/3719484