本篇博客小菌为大家带来的是关于HBase的JavaAPI使用。
创建项目,导入pom
代码语言：javascript复制 <repositories>
<repository>
<id>cloudera</id>
<url>https://repository.cloudera.com/artifactory/cloudera-repos/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.6.0-mr1-cdh5.14.0</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.2.0-cdh5.14.0</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>1.2.0-cdh5.14.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.14.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
<!-- <verbal>true</verbal>-->
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*/RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>然后任意创建一个类,例如: HBaseAPI 接下来正式开始书写Java代码
创建一个数据表
代码语言：javascript复制 /**
* 创建一个数据表
* @throws IOException
*/
@Test
public void createTable() throws IOException {
//实例化配置文件对象
Configuration conf = new Configuration();
//设置连接zookeeper的节点
conf.set("hbase.zookeeper.quorum", "node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
//设置一个管理员
Admin admin = connection.getAdmin();
//设置表名称
TableName tableName = TableName.valueOf("mytest1"); //"myuser" 是字符串
//设置表的列族
HTableDescriptor hTableDescriptor = new HTableDescriptor(tableName);
HColumnDescriptor hColumnDescriptor1 = new HColumnDescriptor("f1");
HColumnDescriptor hColumnDescriptor2= new HColumnDescriptor("f2");
HColumnDescriptor hColumnDescriptor3 = new HColumnDescriptor("f3");
//为表添加列族
hTableDescriptor.addFamily(hColumnDescriptor1);
hTableDescriptor.addFamily(hColumnDescriptor2);
hTableDescriptor.addFamily(hColumnDescriptor3);
//创建表
admin.createTable(hTableDescriptor);
//关闭连接
admin.close();
connection.close();
}添加数据[逐行添加]
代码语言：javascript复制 /**
* 添加数据【逐条添加】
* @throws IOException
*/
@Test
public void putdata1() throws IOException {
//连接数据库
Configuration conf = new Configuration();
//设置连接zookeeper的节点
conf.set("hbase.zookeeper.quorum", "node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
//读取数据
Table mytest1 = connection.getTable(TableName.valueOf("mytest1"));
//创建数据
Put put = new Put("0001".getBytes());
put.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("zhangsan"));
put.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(18));
put.addColumn("f1".getBytes(),"sex".getBytes(),Bytes.toBytes(1));
put.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes("0001"));
//将数据写入数据表
mytest1.put(put);
//关闭连接
connection.close();
}添加数据[多行添加]
代码语言：javascript复制/**
* 添加数据【多条问题】
* @throws IOException
*/
@Test
public void putdata2() throws IOException {
//连接数据库
Configuration conf = new Configuration();
//设置连接zookeeper的节点
conf.set("hbase.zookeeper.quorum", "node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
//读取数据
Table mytest1 = connection.getTable(TableName.valueOf("mytest1"));
//创建put对象，并指定rowkey
Put put = new Put("0002".getBytes());
put.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(1));
put.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("曹操"));
put.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(30));
put.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
put.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("沛国谯县"));
put.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("16888888888"));
put.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("helloworld"));
Put put2 = new Put("0003".getBytes());
put2.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(2));
put2.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("刘备"));
put2.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(32));
put2.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
put2.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("幽州涿郡涿县"));
put2.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("17888888888"));
put2.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("talk is cheap , show me the code"));
Put put3 = new Put("0004".getBytes());
put3.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(3));
put3.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("孙权"));
put3.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(35));
put3.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
put3.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("下邳"));
put3.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("12888888888"));
put3.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("what are you 弄啥嘞！"));
Put put4 = new Put("0005".getBytes());
put4.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(4));
put4.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("诸葛亮"));
put4.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(28));
put4.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
put4.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("四川隆中"));
put4.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("14888888888"));
put4.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("出师表你背了嘛"));
Put put5 = new Put("0005".getBytes());
put5.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(5));
put5.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("司马懿"));
put5.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(27));
put5.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
put5.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("哪里人有待考究"));
put5.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("15888888888"));
put5.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("跟诸葛亮死掐"));
Put put6 = new Put("0006".getBytes());
put6.addColumn("f1".getBytes(),"id".getBytes(),Bytes.toBytes(5));
put6.addColumn("f1".getBytes(),"name".getBytes(),Bytes.toBytes("xiaobubu—吕布"));
put6.addColumn("f1".getBytes(),"age".getBytes(),Bytes.toBytes(28));
put6.addColumn("f2".getBytes(),"sex".getBytes(),Bytes.toBytes("1"));
put6.addColumn("f2".getBytes(),"address".getBytes(),Bytes.toBytes("内蒙人"));
put6.addColumn("f2".getBytes(),"phone".getBytes(),Bytes.toBytes("15788888888"));
put6.addColumn("f2".getBytes(),"say".getBytes(),Bytes.toBytes("貂蝉去哪了"));
List<Put> listPut = new ArrayList<Put>();
listPut.add(put);
listPut.add(put2);
listPut.add(put3);
listPut.add(put4);
listPut.add(put5);
listPut.add(put6);
mytest1.put(listPut);
connection.close();
}查询数据[一行]
代码语言：javascript复制 /**
* 查询 一行 的 数据
* @throws IOException
*/
@Test
public void searchData() throws IOException {
//连接数据库
Configuration conf = new Configuration();
//设置连接zookeeper的节点
conf.set("hbase.zookeeper.quorum", "node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
//读取数据
Table mytest1 = connection.getTable(TableName.valueOf("mytest1"));
// 获取到 rowkey 为0002的数据
Get get = new Get("0002".getBytes());
//result为返回的一行数据
Result result = mytest1.get(get);
//遍历一行内的所有列
Cell[] cells = result.rawCells();
//遍历每一个cell
for (Cell cell : cells) {
// 若 cell的 列名 为 'id' 或 'age'
if (Bytes.toString(CellUtil.cloneQualifier(cell)).equals("id") || Bytes.toString(CellUtil.cloneQualifier(cell)).equals("age")){
// 获取列族名
System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
// 获取 列名
System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
// 获取行键 rowkey
System.out.println(Bytes.toString(CellUtil.cloneRow(cell)));
// 获取 cell的值 【因为age 和 id 列的数据在添加的时候设置为int类型的,故获取也需要用Bytes.toiInt】
System.out.println(Bytes.toInt(CellUtil.cloneValue(cell)));
}else{
System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println(Bytes.toString(CellUtil.cloneRow(cell)));
System.out.println(Bytes.toString(CellUtil.cloneValue(cell)));
}
}
//关闭连接
mytest1.close();
connection.close();
}限定条件查询数据[一行]
代码语言：javascript复制/**
* 限定条件 查询一行 的 数据
* @throws IOException
*/
@Test
public void searchData2() throws IOException {
// 连接数据库
Configuration conf = new Configuration();
conf.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
// 读取表
Table mytest1 = connection.getTable(TableName.valueOf("mytest1"));
// 获取rowkey为0002的行数据
Get get = new Get("0002".getBytes());
// 限定查询的列族
get.addFamily("f1".getBytes()); // 列族为'f1'
//限定查询的列
get.addColumn("f1".getBytes(),"name".getBytes()); // 列名为'name'
//result 是一行数据
Result result = mytest1.get(get);
System.out.println("rowkey : " Bytes.toString(result.getRow()));
// 遍历一行内的所有列
Cell[] cells = result.rawCells();
//遍历每一个cell
for (Cell cell : cells) {
//若cell的列是id , age 就将数据转换成int
//先获取到cell的列名
String qualifier = Bytes.toString(CellUtil.cloneQualifier(cell));
if (qualifier.equals("id")||qualifier.equals("age")){
// 获取到列族名
System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
// 获取到列名
System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
// 获取到值
System.out.println(Bytes.toInt(CellUtil.cloneValue(cell)));
}else {
// 获取到列族名
System.out.println(Bytes.toString(CellUtil.cloneFamily(cell)));
// 获取到列名
System.out.println(Bytes.toString(CellUtil.cloneQualifier(cell)));
// 获取到值
System.out.println(Bytes.toString(CellUtil.cloneValue(cell)));
}
}
// 关闭连接
mytest1.close();
connection.close();
}通过 startKey 和 endKey 进行限制【全表扫描】
代码语言：javascript复制 /**
* 通过 startKey 和 endKey 进行【全表扫描】
* @throws Exception
*/
@Test
public void searchData3() throws Exception {
// 连接 数据库
Configuration conf = new Configuration();
conf.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
//读取表
Table mytest1 = connection.getTable(TableName.valueOf("mytest1"));
// Scan 全表扫描
Scan scan = new Scan();
//设置startKey 和 endKey
scan.setStartRow("0002".getBytes());
scan.setStopRow("0006".getBytes());
ResultScanner scanner = mytest1.getScanner(scan);
//进行遍历打印
for (Result result : scanner) {
// 获取rowkey
System.out.println("rowkey:" Bytes.toString(result.getRow()));
// 获取列族为 f1, 列名为 id 的 value 值
System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"id".getBytes())));
// 获取列族为 f1, 列名为 name 的 value 值
System.out.println(Bytes.toString(result.getValue("f1".getBytes(),"name".getBytes())));
// 获取列族为 f1, 列名为 age 的value 值
System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"age".getBytes())));
}
}全表扫描
代码语言：javascript复制 /**
* 全表扫描数据
* @throws Exception
*/
@Test
public void searchData4() throws Exception {
// 连接 数据库
Configuration conf = new Configuration();
conf.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
Connection connection = ConnectionFactory.createConnection(conf);
//读取表
Table mytest1 = connection.getTable(TableName.valueOf("mytest1"));
// Scan 全表扫描
Scan scan = new Scan();
//scan 为 Hbase 行数据的集合
ResultScanner scanner = mytest1.getScanner(scan);
for (Result result : scanner) {
System.out.println("rowkey:" Bytes.toString(result.getRow()));
// 获取f1列族下的id列
System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"id".getBytes())));
// 获取f1列族下的name列
System.out.println(Bytes.toString(result.getValue("f1".getBytes(),"name".getBytes())));
// 获取f1列族下的age列
//System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"age".getBytes())));
System.out.println(Bytes.toInt(result.getValue("f1".getBytes(),"age".getBytes())));
}
}本次的分享到这里就结束了,受益的小伙伴或对大数据技术感兴趣的朋友记得点赞关注小菌哟(＾Ｕ＾)ノ~ＹＯ后续小菌会为大家带来HBase的JavaAPI使用的升级篇,敬请期待!
