将多行追加到csv

import csv

# 打开CSV文件，追加模式
with open('data.csv', 'a', newline='') as file:
    writer = csv.writer(file)

    # 构建数据行
    data_rows = [
        ['John', 'Doe', 'john@example.com'],
        ['Jane', 'Smith', 'jane@example.com'],
        ['Bob', 'Johnson', 'bob@example.com']
    ]

    # 写入数据行
    writer.writerows(data_rows)

# 关闭文件
file.close()

import java.io.FileWriter;
import java.io.IOException;

public class CSVAppendExample {
    public static void main(String[] args) {
        String csvFile = "data.csv";

        try {
            // 打开CSV文件，追加模式
            FileWriter writer = new FileWriter(csvFile, true);

            // 构建数据行
            String[] dataRow1 = {"John", "Doe", "john@example.com"};
            String[] dataRow2 = {"Jane", "Smith", "jane@example.com"};
            String[] dataRow3 = {"Bob", "Johnson", "bob@example.com"};

            // 写入数据行
            writer.append(String.join(",", dataRow1)).append("\n");
            writer.append(String.join(",", dataRow2)).append("\n");
            writer.append(String.join(",", dataRow3)).append("\n");

            // 关闭文件
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}