《HBase不睡觉书》——客户端API（基础版）

HBase Maven依赖

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <hbase.version>1.3.5</hbase.version>
    </properties>
<dependencies>
        <dependency>
            <groupId>org.apache.hbase</groupId>
            <artifactId>hbase-client</artifactId>
            <version>${hbase.version}</version>
        </dependency>
</dependencies>       

配置文件

• 把HBase配置文件夹中的hbase-site.xml和Hadoop配置文件夹中的core-site.xml配置文件都从服务器上拖下来放到resources文件夹内
• 截屏2020-03-0513.53.13.png

Hello HBase

1. 于加载需要连接HBase的各项配置
   Configuration config = HBaseConfiguration.create();
2. 添加配置文件
   config.addResource(new Path(ClassLoader.getSystemResource("hbase-site.xml").toURI())); config.addResource(new Path(ClassLoader.getSystemResource("core-site.xml").toURI()));
3. 创建Connection
   Connection connection = ConnectionFactory.createConnection(config);
4. 建表
   • 定义表名的TableName
     TableName tableName = TableName.valueOf("mytable");
   • 定义表属性的HTableDescriptor
     HTableDescriptor table = new HTableDescriptor(tablename);
   • 创建列族
     HColumnDescriptor mycf=new HColumnDescriptor("mycf"); table.addFamily(new HColumnDescriptor(mycf));
   • 执行
     Admin admin = connection.qetAdmin(); admin.createTable(table);
   • 结束
     admin.close(); connection.close();
5. 综上

public class Client {

    public static void main(String[] args) throws URISyntaxException {
        // 获取配置文件
        Configuration conf = HBaseConfiguration.create();
        conf.addResource(new Path(ClassLoader.getSystemResource("hbase-site.xml").toURI()));
        conf.addResource(new Path(ClassLoader.getSystemResource("core-site.xml").toURI()));
        // 创建连接
        try {
            Connection connection = ConnectionFactory.createConnection(conf);
            Admin admin = connection.getAdmin();
            // 定义表名
            TableName tableName = TableName.valueOf("mytable");
            // 定义表
            HTableDescriptor table = new HTableDescriptor(tableName);
            // 定义列族
            HColumnDescriptor mycf = new HColumnDescriptor("mycf");
            table.addFamily(new HColumnDescriptor(mycf));
            // 执行创建表动作
            admin.createTable(table);
            admin.close();
            connection.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}