The advantages and application scenarios of the Streaming Excel Reader framework in the Java class library
The advantages and application scenarios of the Streaming Excel Reader framework in the Java class library
Overview:
Streaming Excel Reader is a powerful Java class library for handling large Excel files.Compared to the traditional Excel reading library, Streaming Excel Reader has many advantages and is widely used in various application scenarios.This article will introduce the advantages of the Streaming Excel Reader framework and the scenes it can apply, and provide some Java code examples to illustrate its usage.
Advantage:
1. Low memory occupation: The traditional Excel read library usually loads the entire file to the memory, resulting in huge memory consumption when processing large excel files.Streaming Excel Reader divides files into small pieces through streaming processing, which only loads and process data when needed, greatly reduces memory occupation.
2. Reading efficiently: Streaming Excel Reader supports parallel processing multiple worksheets, and can read a large amount of data at the same time.It uses an event -based model, which can quickly analyze the excel file and extract the required data, which greatly improves the reading speed.
3. Disposure error: Traditional Excel read libraries often throw abnormality when encountering irregular Excel files and terminate the program execution.Streaming Excel Reader uses a fault tolerance mechanism to deal with various format problems, such as empty lines, spaces, merging cells, etc., and can return valuable error information, so that the program can continue to execute or perform appropriate processing.
4. Processing large Excel file: Streaming Excel Reader designed for processing large excel files.It can effectively process millions of lines of data, not due to the size of the file.
Application scenario:
1. Data introduction: In some business scenarios, you need to read data from Excel files and import them into databases or other data sources.Streaming Excel Reader is an ideal choice for processing large excel files. It can efficiently read Excel data and convert it to data that can be used for import.
2. Data analysis: For analysis tasks that need to process a large amount of data, using traditional Excel reading libraries may encounter performance problems.Streaming Excel Reader can quickly read and analyze large Excel files through streaming and parallel processing, making data analysis more efficient.
3. Data cleaning and conversion: During the data cleaning and conversion process, a variety of Excel file formats and various abnormal conditions need to be processed.The fault tolerance and flexibility of Streaming Excel Reader make it an ideal tool for processing data cleaning and conversion.
Example code:
The following is a simple example of reading the excel file using Streaming Excel Reader:
import com.monitorjbl.xlsx.StreamingReader;
import com.monitorjbl.xlsx.impl.StreamingCell;
import org.apache.poi.ss.usermodel.Row;
import java.io.*;
import java.util.Iterator;
public class ExcelReaderExample {
public static void main(String[] args) {
File file = new File("data.xlsx");
try {
FileInputStream fis = new FileInputStream(file);
StreamingReader reader = StreamingReader.builder()
.Rowcachesize (100) // cache size
.buffersize (4096) // Stream buffer size
.open(fis);
for (Sheet sheet : reader) {
System.out.println("Sheet: " + sheet.getName());
for (Row row : sheet) {
for (org.apache.poi.ss.usermodel.Cell cell : row) {
if (cell instanceof StreamingCell) {
StreamingCell streamingCell = (StreamingCell) cell;
System.out.println("Cell value: " + streamingCell.getStringCellValue());
}
}
}
}
reader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
The above sample code uses Streaming Excel Reader to read an excel file named "Data.xlsx", and print the value of its cells by line.
in conclusion:
The Streaming Excel Reader framework has significant advantages when processing large excel files, including low memory occupation, efficient reading, abnormal fault tolerance and processing large files.It is suitable for various application scenarios such as data introduction, data analysis, and data cleaning and conversion.Through the example code provided here, you can better understand and use the Streaming Excel Reader framework.
