如何在java中删除csv文件中特定字段中的逗号

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class CSVFileProcessor {
    public static void main(String[] args) {
        String csvFilePath = "path/to/csv/file.csv";
        String modifiedCsvFilePath = "path/to/modified/csv/file.csv";
        String targetField = "field_name";

        try {
            // 读取CSV文件
            BufferedReader reader = new BufferedReader(new FileReader(csvFilePath));
            String line;
            StringBuilder modifiedContent = new StringBuilder();

            // 解析CSV文件并删除特定字段中的逗号
            while ((line = reader.readLine()) != null) {
                String[] fields = line.split(",");
                for (int i = 0; i < fields.length; i++) {
                    if (fields[i].equals(targetField)) {
                        fields[i] = fields[i].replace(",", "");
                    }
                }
                modifiedContent.append(String.join(",", fields)).append("\n");
            }
            reader.close();

            // 写入修改后的CSV文件
            BufferedWriter writer = new BufferedWriter(new FileWriter(modifiedCsvFilePath));
            writer.write(modifiedContent.toString());
            writer.close();

            System.out.println("CSV文件中特定字段中的逗号已成功删除，并保存到新的CSV文件中。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}