如何在Java中按特定列对csv文件进行排序

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class CSVSorter {
    public static void main(String[] args) {
        String csvFile = "input.csv";
        String outputFile = "output.csv";
        int sortColumn = 2; // 按第2列排序

        List<String[]> data = new ArrayList<>();

        try (BufferedReader br = new BufferedReader(new FileReader(csvFile))) {
            String line;
            while ((line = br.readLine()) != null) {
                String[] fields = line.split(",");
                data.add(fields);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        Collections.sort(data, new Comparator<String[]>() {
            @Override
            public int compare(String[] o1, String[] o2) {
                return o1[sortColumn - 1].compareTo(o2[sortColumn - 1]);
            }
        });

        try (BufferedWriter bw = new BufferedWriter(new FileWriter(outputFile))) {
            for (String[] fields : data) {
                StringBuilder sb = new StringBuilder();
                for (String field : fields) {
                    sb.append(field).append(",");
                }
                sb.deleteCharAt(sb.length() - 1); // 删除最后一个逗号
                bw.write(sb.toString());
                bw.newLine();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("CSV文件排序完成！");
    }
}