【HBase】(一) HBase安装配置+JavaAPI

一、安装前提

1、Hadoop环境搭建
2、zookeeper环境搭建

找到官网下载 hbase 安装包 hbase-1.2.0-bin.tar.gz， 下载地址：http://mirrors.hust.edu.cn/apache/hbase/
上传安装包到指定目录，解压

tar -zxvf [文件] 

二、修改配置文件

==>进入conf目录下
1.修改hbase-env.sh

export JAVA_HOME=/opt/soft/jdk180   具体的jdk安装路径
export HBASE_MANAGES_ZK=false       使用外部zookeeper

2.修改hbase-site.xml文件

<!--hbase.rootdir 将数据写入哪个目录 如果是单机版只要配置此属性就可以，value中file:/绝对路径，如果是分布式则配置与hadoop的core-site.sh服务器、端口以及zookeeper中事先创建的目录一致-->
<property>
	 <name>>hbase.rootdir</name>
	 <value>hdfs://192.168.56.137:9000/hbase</value>
</property>

<!--单机模式不需要配置，分布式配置此项为true-->
<property>
	 <name>hbase.cluster.distributed</name>
	 <value>true</value>
</property>

<!--单机模式不需要配置 分布是配置此项为zookeeper指定的物理路径名 指定 zk 的地址，多个用“,”分割-->
<property>
	 <name>hbase.zookeeper.property.dataDir</name>
	 <value>/opt/soft/zookeeper345/data</value>
	</property>

3.修改regionservers
如果搭建的是完全分布式的集群，就还需要修改regionservers ，可参考如下方式,伪分布式保持原本的localhost

[hadoop@hadoop1 conf]$ vi regionservers 
hadoop1
hadoop2
hadoop3
hadoop4

配置环境变量
zookeeper 和hbase的环境变量

export ZOOKEEPER_HOME=/opt/soft/zookeeper345  具体的zookeeper安装路径
export PATH=$PATH:$ZOOKEEPER_HOME/bin 
export HBASE_HOME=/opt/soft/hbase120  具体的hbase安装路径
export PATH=$PATH:$HBASE_HOME/bin 

三、启动Hbase

按顺序启动

1、启动zookeeper
zkServer.sh start (stop/停止)
2、启动hbase
start-hbase.sh

使用zookeeper客户端

zkCli.sh
使用hbase shell
hbase shell

四、Hbase API

1、创建Maven工程引入架包
pom.xml

  <!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-client -->
    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-client</artifactId>
      <version>1.2.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-common -->
    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-common</artifactId>
      <version>1.2.0</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-server -->
    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-server</artifactId>
      <version>1.2.0</version>
    </dependency>

编写Java类

package com.services;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;


/**
 * @Date: 2019/12/23
 * @Description:
 */
public class MyDemo {
    public static void main(String[] args) throws Exception {
     //配置文件
       Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "192.168.56.171:2181");
        //创建连接
        Connection connection = ConnectionFactory.createConnection(conf);
        Table customer = connection.getTable(TableName.valueOf("mydemo:users"));
        Scan scan = new Scan();
        //结果集
        ResultScanner res = customer.getScanner(scan);
        for (Result rs : res) {
            System.out.println(Bytes.toString(rs.getValue("base".getBytes(),"username".getBytes())));
        }
        //关闭
        res.close();
        connection.close();
    }
}

模糊查询

package com.services;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.RegexStringComparator;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;

/**
 * @Date: 2019/12/23
 * @Description:
 */
public class MyScan {
    public static void main(String[] args) throws Exception {
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "192.168.56.171:2181");//连接zookeeper配置端口
        //创建连接
        Connection connection = ConnectionFactory.createConnection(conf);
        //
        Table customer = connection.getTable(TableName.valueOf("customer"));
        //
        Scan scan = new Scan();
        //模糊查询
        SingleColumnValueFilter filter = new SingleColumnValueFilter("cf".getBytes(),
                "fname".getBytes(),
                CompareFilter.CompareOp.EQUAL,
                new RegexStringComparator("J.*"));
        scan.setFilter(filter);
        //结果集
        ResultScanner res = customer.getScanner(scan);
        for (Result rs : res) {
            System.out.println(Bytes.toString(rs.getValue("cf".getBytes(),"fname".getBytes()))
                    +":"+Bytes.toString(rs.getValue("cf".getBytes(),"lname".getBytes())));
        }
        //关闭
        res.close();
        connection.close();
    }

}

插入操作

package com.njbdqn.services;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;

/**
 * @Date: 2019/12/23
 * @Description:
 */
public class MyPut {
    public static void main(String[] args) throws Exception {
        Configuration conf = HBaseConfiguration.create();
        conf.set("hbase.zookeeper.quorum", "192.168.56.171:2181");//连接zookeeper配置端口
        //创建连接
        Connection connection = ConnectionFactory.createConnection(conf);
        //表名
        Table users = connection.getTable(TableName.valueOf("mydemo:users"));
        //插入数据 指定行键
        Put pt = new Put("5".getBytes());
        pt.addColumn("base".getBytes(), "username".getBytes(), "sq".getBytes());
        pt.addColumn("base".getBytes(), "age".getBytes(), "20".getBytes());
        pt.addColumn("details".getBytes(), "like".getBytes(), "sleep,eat".getBytes());

        users.put(pt);
    }
}