20230922学习总结java连接HBASE

连接条件：

1、所有虚拟机上运行hadoop集群、运行zookeeper进程守护

 2、向项目中导入

即hbase安装目录下的conf文件夹中的两个文件

 3、添加maven依赖

<dependencies>
    <dependency> 
        <groupId>org.apache.hbase</groupId> 
        <artifactId>hbase-server</artifactId>
        <version>0.96.1-hadoop2</version> 
    </dependency>
    <dependency>
        <groupId>org.apache.hbase</groupId>
        <artifactId>hbase-client</artifactId>
        <version>2.1.0</version>
    </dependency>
</dependencies>

或添加/hbase/lib下的所有jar包以及/hbase/lib/client-facing-thirdparty下所有jar包

4、运行代码

package Hbase.Connector;

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

import java.io.IOException;

public class Connector {
    private Connection connection=null;

    private Admin admin=null;
   
    public Connector(){
        try{
            Configuration configuration = HBaseConfiguration.create();
            
            configuration.set("hbase.rootdir", "hdfs://node1.itcast.cn:8020/hbase");
            configuration.set("hbase.zookeeper.quorum","node1,node2,node3");
            //与hbase-site.xml里的配置相关
            
            //2、创建连接对象
            connection= ConnectionFactory.createConnection(configuration);
            //3、创建Admin对象
            admin = connection.getAdmin();
            System.out.println("连接成功::"+connection);
        }catch (IOException e){
            //e.printStackTrace();
            System.out.println("连接失败");
        }
    }
    public void Close(){
        if(connection!=null){
            try {
                connection.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        if(admin!=null){
            try{
                admin.close();
            }catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }
}