将文件上传到hdfs文件系统后通过读文件将信息插入到HBase表中,调用insertrow方法
时间: 2024-01-08 10:02:09 浏览: 75
好的,您的问题是如何将上传到HDFS的文件插入到HBase表中,对吧?我可以给您提供一些思路和代码示例。首先,您需要使用Hadoop的API将文件从本地上传到HDFS中,可以使用以下代码实现:
```java
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import java.net.URI;
public class UploadToHdfs {
public static void main(String[] args) throws Exception {
String localFilePath = "/path/to/local/file";
String hdfsFilePath = "/path/to/hdfs/file";
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(new URI(hdfsFilePath), conf);
fs.copyFromLocalFile(new Path(localFilePath), new Path(hdfsFilePath));
fs.close();
}
}
```
接下来,您需要使用HBase的Java API将文件中的信息插入到表中。可以使用以下代码示例:
```java
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;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import java.net.URI;
public class InsertToHBase {
public static void main(String[] args) throws Exception {
String hdfsFilePath = "/path/to/hdfs/file";
String tableName = "table_name";
String columnFamily = "cf";
String columnQualifier = "cq";
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
Table table = conn.getTable(TableName.valueOf(tableName));
FileSystem fs = FileSystem.get(new URI(hdfsFilePath), conf);
BufferedReader br = new BufferedReader(new InputStreamReader(fs.open(new Path(hdfsFilePath))));
String line;
while ((line = br.readLine()) != null) {
String[] columns = line.split(",");
String rowKey = columns[0];
String value = columns[1];
Put put = new Put(Bytes.toBytes(rowKey));
put.addColumn(Bytes.toBytes(columnFamily), Bytes.toBytes(columnQualifier), Bytes.toBytes(value));
table.put(put);
}
br.close();
fs.close();
table.close();
conn.close();
}
}
```
这段代码从HDFS中读取文件的每一行,将第一个字段作为行键,第二个字段作为值,然后将它们插入到HBase表中。
希望这些代码能够帮助到您!
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