"Streaming Excel Reader" framework technical analysis based on the Java class library
"Streaming Excel Reader" framework technical analysis based on the Java class library
preface:
When dealing with large -scale Excel files, the conventional Excel reading method will cause memory overflow or performance problems.In response to this problem, a optimized solution is to read Excel files using streaming.In Java development, there are multiple class libraries that can achieve streaming reading Excel. One of the important class libraries is "Streaming Excel Reader" (referred to as SER).This article will analyze the technical principles of the SER framework and provide the corresponding Java code example.
1. Background introduction
SER is a Java class library based on Apache Poi and XMLBEANS. It can read large -scale Excel files in a streaming manner, and has low memory occupation and high reading performance.Compared with the traditional POI method, the Series can be read by avoiding loading the entire Excel file to the memory. Instead, it is used to read Excel data based on event -driven models to achieve efficient processing of large -scale excel files.Essence
Second, the core principle of the SER framework
The core principle of the SER framework is to use the XMLBEANS library to analyze the Excel binary file. This library is a sub -item of the POI that can be converted to the XML format for processing, which can read Excel data more efficiently.Based on this principle, the analysis of XMLBEANS is encapsulated into Java objects and provided a simple and easy -to -use API, so that developers can easily read Excel data.
How to use the SER framework
The following is a simple example of using SER to read Excel:
import com.monitorjbl.xlsx.StreamingReader;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class ExcelReaderExample {
public static void main(String[] args) throws IOException, InvalidFormatException {
File file = new File("path/to/excel.xlsx");
FileInputStream fis = new FileInputStream(file);
StreamingReader.Builder builder = StreamingReader.builder();
Builder.rowcachesize (100); // Set line cache size
Builder.buffersize (4096); // Set the buffer size
try (StreamingReader reader = builder.open(fis)) {
for (Sheet sheet : reader){
for (Row r : sheet){
for (Cell c : r){
// Process data of each cell
System.out.println(c.getStringCellValue());
}
}
}
}
}
}
In the above examples, first create a StreamingRead object, and set the line cache size and the size of the buffer area.Then use the builder.open () method to open an input stream.Next, we use for cycles to traverse each sheet, each row and each cell, and obtain cell data and process it through the getcell () method.
Fourth, the advantages and applicable scenarios of the SER framework
Compared with the traditional POI method, the Series have the following advantages:
1. Small memory occupation: Due to the use of streaming processing, Serita does not need to load the entire Excel file into the memory, which can greatly reduce memory occupation.
2. High read performance: SER can provide higher reading performance by reading Excel data based on event -driven models, especially when processing large -scale excel files is more obvious.
3. Simple and easy -to -use: SER provides a set of simple APIs that allow developers to easily read Excel data.
SER is suitable for the following scenes:
1. Processing large -scale Excel file: When you need to read a large -scale Excel file, the Series can significantly improve the reading performance.
2. Low memory equipment: For equipment with smaller memory, SER can reduce memory occupation to improve overall performance.
in conclusion:
This article conducts technical analysis of the "Streaming Excel Reader" (SER) framework based on the Java library, and provides example code that uses this framework for Excel reading.By using the SER framework, developers can efficiently read large -scale Excel files in a streaming manner and reduce memory occupation, thereby improving system performance and user experience.
