Technical interpretation of the "Streaming Excel Reader" framework in the Java class library
Streaming Excel Reader is a framework in the Java class library for reading data in the Excel document.It adopts a streaming process, which can efficiently handle large excel files without occupying too much memory.This framework provides a simple and easy -to -use API, so that developers can easily extract data from the Excel file and perform corresponding operations.
Before using the Streaming Excel Reader framework, we need to introduce related dependencies first.The main dependency packages include `poi-OOXML` and` xmlbeans`.We can manage these dependencies through building tools such as Maven or Gradle.
Below is a simple example, showing how to use the Streaming Excel Reader framework to read the data in the Excel file:
import com.monitorjbl.xlsx.StreamingReader;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class ExcelReaderExample {
public static void main(String[] args) {
try {
// Create an excel file input stream
FileInputStream file = new FileInputStream(new File("path/to/excel-file.xlsx"));
// Use Streaming Excel Reader to read Excel file
StreamingReader reader = StreamingReader.builder()
.Rowcachesize (100) // Set the cache size, you can adjust it as needed
.open(file);
// Traversing all worksheets
for (Sheet sheet : reader) {
// Each line in the worksheet
for (Row row : sheet) {
// Process each line of data
// For example, get the value of the first column
String value = row.getCell(0).getStringCellValue();
System.out.println("Value: " + value);
}
}
// Close flowing
reader.close();
file.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above example, we first created an Excel file input stream, and then used the Streaming Excel Reader's `builder ()` method to create a reader object.Set up a row cavity size to 100, which can improve the performance of reading large excel files.Next, we traversed all the worksheets, traversed in each worksheet, and processed the data of each line.
It should be noted that the Streaming Excel Reader framework will have some default conversion rules for specific cell types (such as dates, time, numbers, etc.).If you need to customize the conversion rules, you can add a custom converter by implementing the `converter` interface.
To sum up, the Streaming Excel Reader framework is an efficient, easy -to -use Java class library for reading data in the Excel file.It can quickly handle large Excel files through streaming methods and provide rich API for developers.Whether it is a corporate application or a personal project, this framework can provide a convenient solution.
