使用java生成parquet格式文件的过程及示例
时间: 2024-05-05 18:19:32 浏览: 32
生成Parquet格式文件需要使用Parquet工具包,以下是使用Java生成Parquet格式文件的示例代码:
```java
import org.apache.hadoop.fs.Path;
import org.apache.parquet.column.ParquetProperties;
import org.apache.parquet.example.data.Group;
import org.apache.parquet.example.data.simple.SimpleGroupFactory;
import org.apache.parquet.hadoop.ParquetFileWriter.Mode;
import org.apache.parquet.hadoop.ParquetWriter;
import org.apache.parquet.hadoop.example.GroupWriteSupport;
import org.apache.parquet.hadoop.metadata.CompressionCodecName;
public class GenerateParquetFile {
public static void main(String[] args) throws Exception {
String fileName = "example.parquet";
// Create a Group object
SimpleGroupFactory groupFactory = new SimpleGroupFactory(GroupWriteSupport.getSchema());
Group group = groupFactory.newGroup()
.append("id", 1)
.append("name", "Tom")
.append("age", 25)
.append("score", 89.5f);
// Create a ParquetWriter object
Path path = new Path(fileName);
GroupWriteSupport writeSupport = new GroupWriteSupport();
ParquetWriter<Group> writer = new ParquetWriter<>(path, writeSupport,
CompressionCodecName.SNAPPY, ParquetWriter.DEFAULT_BLOCK_SIZE,
ParquetWriter.DEFAULT_PAGE_SIZE, ParquetWriter.DEFAULT_PAGE_SIZE,
true, false, ParquetProperties.WriterVersion.PARQUET_2_0, Mode.CREATE);
// Write the Group object to the Parquet file
writer.write(group);
// Close the ParquetWriter object
writer.close();
}
}
```
这段代码使用SimpleGroupFactory创建了一个Group对象,然后使用ParquetWriter将该对象写入Parquet文件中。需要注意的是,需要使用GroupWriteSupport类指定Parquet schema。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)