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HBase是一个分布式、可扩展的非关系型数据库,用于存储大量稀疏数据
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
public class HBaseConnection {
public static void main(String[] args) throws Exception {
Configuration config = HBaseConfiguration.create();
config.set("hbase.zookeeper.quorum", "localhost");
Connection connection = ConnectionFactory.createConnection(config);
System.out.println("Connected to HBase");
connection.close();
}
}
Table
对象并使用get
方法获取行。这里是一个示例: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.Get;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
public class HBaseReadData {
public static void main(String[] args) throws Exception {
Configuration config = HBaseConfiguration.create();
config.set("hbase.zookeeper.quorum", "localhost");
Connection connection = ConnectionFactory.createConnection(config);
Table table = connection.getTable(TableName.valueOf("your_table_name"));
Get get = new Get(Bytes.toBytes("row_key"));
Result result = table.get(get);
byte[] value = result.getValue(Bytes.toBytes("column_family"), Bytes.toBytes("column_qualifier"));
String valueStr = Bytes.toString(value);
System.out.println("Value: " + valueStr);
table.close();
connection.close();
}
}
public class DataCleaning {
public static void main(String[] args) {
String input = "Value123!@#456";
String cleaned = input.replaceAll("[^a-zA-Z\\s]", "");
System.out.println("Cleaned value: " + cleaned);
}
}
Put
对象。以下是一个示例: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 HBaseWriteData {
public static void main(String[] args) throws Exception {
Configuration config = HBaseConfiguration.create();
config.set("hbase.zookeeper.quorum", "localhost");
Connection connection = ConnectionFactory.createConnection(config);
Table table = connection.getTable(TableName.valueOf("your_table_name"));
Put put = new Put(Bytes.toBytes("row_key"));
put.addColumn(Bytes.toBytes("column_family"), Bytes.toBytes("column_qualifier"), Bytes.toBytes("Cleaned Value"));
table.put(put);
table.close();
connection.close();
}
}
请注意,这些示例仅用于演示如何在Java中与HBase进行交互以及如何进行基本的数据清洗。在实际应用中,您可能需要根据具体需求对代码进行调整。
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