2024.9.12（周四）

hadoop实现后台修改

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;
import org.apache.hadoop.hbase.util.Bytes;

public class HBaseUpdateExample {

    public static void main(String[] args) {
        // 创建HBase配置对象
        Configuration config = HBaseConfiguration.create();
        // 配置HBase的Zookeeper地址
        config.set("hbase.zookeeper.quorum", "localhost");
        config.set("hbase.zookeeper.property.clientPort", "2181");

        Connection connection = null;
        Table table = null;

        try {
            // 建立HBase连接
            connection = ConnectionFactory.createConnection(config);
            table = connection.getTable(TableName.valueOf("my_table"));

            // 创建Put对象
            // 参数：rowKey, 列族:列限定符, 值
            Put put = new Put(Bytes.toBytes("row1"));
            put.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("qualifier"), Bytes.toBytes("new_value"));

            // 执行Put操作
            table.put(put);
            System.out.println("Data updated successfully!");

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (table != null) table.close();
                if (connection != null) connection.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}