Streaming Excel Reader framework detailed explanation of the steps of Excel data stream analysis in the Java library
Streaming Excel Reader framework detailed explanation of the steps of Excel data stream analysis in the Java library
Streaming Excel Reader is a framework that implements Excel data flow analysis in the Java class library.It is based on the Apache Poi library and analyzes the excel file into a data stream through a streamlined way.This flow analysis method can greatly reduce memory consumption, especially suitable for handling large Excel files.
The following is the complete step of using the Streaming Excel Reader framework to implement Excel data stream resolution in the Java library:
1. Introduce Streaming Excel Reader Relying Library: In the Java project, the first need to introduce the dependency library of Streaming Excel Reader in the construction tool.For example, in the Maven project, the following dependencies can be added to the POM.XML file:
<dependencies>
<dependency>
<groupId>com.monitorjbl</groupId>
<artifactId>xlsx-streamer</artifactId>
<version>2.1.0</version>
</dependency>
</dependencies>
2. Create StreamingReader Object: In the Java code, you first need to create a StreamingReader object and specify the Excel file path to be parsed.For example:
InputStream is = new FileInputStream("path/to/excel.xlsx");
StreamingReader reader = StreamingReader.builder()
.Rowcachesize (100) // Cache line number
.buffersize (4096) // Cushion size
.opeen (is); // Open the input stream
3. iteration analysis Excel line: Through the StreamingReader object, we can use iterators to parse the Excel file by line by line.For example:
for (Row row : reader) {
// Process each line of data
for (Cell cell : row) {
// Process data of each cell
String cellValue = cell.getStringCellValue();
// Make business logic processing
}
}
4. Complete analysis: After processing all the data, you need to close the relevant resources.For example:
Reader.close (); // Close the streamingReader object
is.close (); // Close the input stream
Through the above steps, we can use the Streaming Excel Reader framework to implement Excel data stream analysis in the Java library.This flow analysis method enables us to efficiently handle large Excel files and reduce memory consumption.
Below is a complete sample code, which shows how to use the Streaming Excel Reader framework to resolve the Excel data stream:
import com.monitorjbl.xlsx.StreamingReader;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import java.io.FileInputStream;
import java.io.InputStream;
public class ExcelParser {
public static void main(String[] args) {
try {
InputStream is = new FileInputStream("path/to/excel.xlsx");
StreamingReader reader = StreamingReader.builder()
.rowCacheSize(100)
.bufferSize(4096)
.open(is);
for (Row row : reader) {
for (Cell cell : row) {
String cellValue = cell.getStringCellValue();
// Make business logic processing
System.out.println(cellValue);
}
}
reader.close();
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
The above is the detailed explanation of the steps of Excel data stream resolution using the Streaming Excel Reader framework in the Java library.Through this framework, we can efficiently analyze the large Excel files and handle the data flexibly.
