本机idea连接虚拟机中的Hbase

相关环境：

虚拟机：Centos7

hadoop版本:3.1.3 hbase版本:2.4.11 zookeeper版本:3.5.7

Java IDE:IDEA JDK：8

步骤

步骤一：在idea创建一个maven项目

步骤二：在虚拟机里找到core-site.xml和hbase-site.xml这两个文件

我的core-site.xml文件是在hadoop安装目录下的etc/hadoop中

hbase-site.xml文件在hbase安装目录下的conf中

找到后下载下来，然后放到idea的src/main/resources中

步骤三：导入相关依赖

<dependencies>
        <!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-server -->
        <dependency>
            <groupId>org.apache.hbase</groupId>
            <artifactId>hbase-client</artifactId>
            <version>2.4.17</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-client -->
        <dependency>
            <groupId>org.apache.hbase</groupId>
            <artifactId>hbase-client</artifactId>
            <version>2.4.17</version>
        </dependency>
</dependencies>

步骤四：写一个测试类测试一下

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

import java.io.IOException;

public class connect_test
{
    public static Connection connection = null;
    public static Admin admin = null;

    static
    {
        try
        {
            //1、获取配置信息
            Configuration configuration = HBaseConfiguration.create();
            configuration.set("hbase.rootdir", "hdfs://hadoop102:8020/hbase");
            configuration.set("hbase.zookeeper.quorum", "hadoop102,hadoop103,hadoop104");
            //2、创建连接对象
            connection = ConnectionFactory.createConnection(configuration);
            //3、创建Admin对象
            admin = connection.getAdmin();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    //判断表是否存在
    public static boolean isTableExist(String tableName) throws IOException
    {
        boolean exists = admin.tableExists(TableName.valueOf(tableName));
        return exists;
    }

    public static void close()
    {
        if (admin != null)
        {
            try
            {
                admin.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        if (connection != null)
        {
            try
            {
                connection.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) throws IOException
    {
        //测试hbase是否存在名为test的表
        System.out.println(isTableExist("test"));
        //关闭资源
        close();
    }
}

比较关键的是下面这两个配置信息

configuration.set("hbase.rootdir", "hdfs://hadoop102:8020/hbase");
configuration.set("hbase.zookeeper.quorum", "hadoop102,hadoop103,hadoop104");
            

这两个信息可以在hbase-site.xml中可以找到

然后运行测试，结果为true，说明hbase中存在表为test的表。测试成功，成功连接hbase