OpenCSV ライブラリを使用した Java での CSV ファイルの読み取りと書き込みの例

    com.opencsv
    opencsv
    5.5.2

import com.opencsv.CSVReader;

import java.io.FileReader;
import java.io.IOException;
import java.util.List;

public class CSVReaderExample {
    public static void main(String[] args) {
        try {
            CSVReader reader = new CSVReader(new FileReader("path/to/csv/file.csv"));
            List data = reader.readAll();

            for (String[] row : data) {
                for (String cell : row) {
                    System.out.print(cell + "    ");
                }
                System.out.println();
            }

            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import com.opencsv.CSVWriter;

import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class CSVWriterExample {
    public static void main(String[] args) {
        try {
            CSVWriter writer = new CSVWriter(new FileWriter("path/to/csv/file.csv"));

            List data = new ArrayList<>();
            data.add(new String[]{"Name", "Age", "City"});
            data.add(new String[]{"John", "25", "New York"});
            data.add(new String[]{"Jane", "30", "London"});

            writer.writeAll(data);

            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}