Java：如何解析大量数据。csv文件？

Question

我正在编写一个Java程序，可以读取。csv文件，并从文件的特定列中提取信息。csv文件，并将它们全部放入一个单独的文件中。csv文件。我现在的工作方式很好，但是我有100多个。我需要从csv文件中提取，所以像我在main方法中那样一个接一个地写出它们似乎效率不高。我不太熟悉数据结构，但有没有一种方法可以实现ArrayList，存储我所有的数据。csv文件，并获得相同的结果，而不必太多地修改我的代码

import java.io.BufferedReader;  
import java.io.FileReader;  
import java.io.*;

public class csvParser {

    public static FileWriter createOutputCsvFile(String pathToFile) {

        try {
            FileWriter csvWriter = new FileWriter(pathToFile);
            return csvWriter; 
        }
        
        catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
            return null;  
        }
    }

    // Parses and calculates the source count, destination count and incoming/outgoing packet sizes 
    public static void parseCsvFile(String pathToFile, FileWriter csvWriter) {
       
        try {
            String row;
            int incomingPacketSize = 0;
            int outgoingPacketSize = 0;
            int sourceCount = 0;
            int destinationCount = 0;

            BufferedReader csvReader = new BufferedReader(new FileReader(pathToFile));
           
            while ((row = csvReader.readLine()) != null) {
                String[] line = row.split(",");
                String source = line[2];
                String destination = line[3];
                // remove quotes around the length string
                String length = line[5].replace("\"", "");

                if (source.equals("\"192.168.100.180\"")) {
                    sourceCount++;
                    incomingPacketSize += Integer.parseInt(length);
                }

                if (destination.equals("\"192.168.100.180\"")) {
                    destinationCount++;
                    outgoingPacketSize += Integer.parseInt(length);
                }
            }

            // write to output csv
            writeOutputToCSV(csvWriter, sourceCount, destinationCount, incomingPacketSize, outgoingPacketSize);

        }
        catch (Exception e) {
            System.err.println("Error: " + e.getMessage());  
        }
    }

    // Write the source count, destination count and incoming/outgoing packet sizes to the output csv file
    public static void writeOutputToCSV(FileWriter csvWriter, int sourceCount, int destinationCount, int incomingPacketSize, int outgoingPacketSize) {

       try {
           csvWriter.append(sourceCount + "," + destinationCount + ","+  incomingPacketSize + "," + outgoingPacketSize + "\n");
           csvWriter.flush();
        }
        catch (Exception e) {
            System.err.println("Error: " + e.getMessage());  
        }
    }

    public static void main(String[] args) {

    
        FileWriter csvWriter = createOutputCsvFile("/Users/saadkhan/Desktop/Assignment/csv/Outpit.csv");
        
        if (csvWriter == null) {
            System.out.println("Error creating output csv file");
            System.exit(0);
        }

        parseCsvFile("/Users/saadkhan/Desktop/Assignment/csv/1DNSSplit1.csv", csvWriter);
        parseCsvFile("/Users/saadkhan/Desktop/Assignment/csv/1DNSSplit2.csv", csvWriter);
    }
}