In -depth analysis of the "Streaming Excel Reader" framework technology in the Java library
Streaming Excel Reader is a framework technology in a Java library that provides efficient reading functions when processing large excel files.As more and more enterprises and organizations use Excel as the preferred format for data exchange and storage, the processing of large Excel files is becoming increasingly important and common.However, traditional methods may become difficult to read and process these files due to the long memory limit and processing time.
Streaming Excel Reader has only processed a small (or block) data at a time when reading files, and the entire file is not necessary to load the entire file into the memory, thereby solving the traditional method limit.This can greatly reduce the amount of memory and improve the processing speed.The advantages of this streaming reading are particularly significant when dealing with large excel files.
Streaming Excel Reader uses an event -driven model to use Apache Poi (a popular Java library to operate Microsoft Office files), which realizes the line of analysis and reading of Excel files.It uses a lightweight callback function to process the data of each row and pass it to business logic for processing.This event driver model makes it relatively easy to customize and expand, and can be adjusted according to the specific requirements of the application.
Here are a Java code example using Streaming Excel Reader to read the excel file:
import com.github.jbapple.poi.xssf.streaming.StreamingReader;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
public class ExcelReaderExample {
public static void main(String[] args) throws IOException {
String filePath = "path/to/excel/file.xlsx";
try (InputStream inputStream = new FileInputStream(filePath);
StreamingReader reader = StreamingReader.builder()
.sstCacheSize(100)
.open(inputStream)) {
// Traversing each worksheet in Excel file
for (Sheet sheet : reader) {
// Each line in the worksheet
for (Row row : sheet) {
// Process each line of data
for (int cellIndex = 0; cellIndex < row.getLastCellNum(); cellIndex++) {
System.out.print(row.getCell(cellIndex) + " ");
}
System.out.println();
}
}
}
}
}
In the above example, we first specify the path of the Excel file, and then use the `FileInputStream` to create an input stream from the file.Then, we use the `StreamingReader` to open this input stream.By using the `streamingReader`, we can traverse each worksheet and each line in the Excel file, and obtain the cell data in each line through the` Row.getCell (CellIndex) `.In this example, we simply print out the values of each cell, and you can perform more complicated data processing operations according to your needs.
By using the Streaming Excel Reader framework technology, we can easily handle large Excel files without having to worry about memory limit and performance problems.It provides an efficient and flexible method for processing Excel data, so that developers can focus more on the realization of business logic.
