import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;
import com.alibaba.excel.write.metadata.WriteSheet;

import java.util.ArrayList;
import java.util.List;

public class CustomCSVFormatExample {

    public static void main(String[] args) {
        String fileName = "output.csv";

        // 准备数据
        List<CustomData> dataList = new ArrayList<>();
        dataList.add(new CustomData("张三", "李四", "王五", "赵六"));

        // 写入 CSV 文件
        EasyExcel.write(fileName, CustomData.class)
                .sheet("Sheet1")
                .registerConverter(new CustomCSVConverter()) // 注册自定义的 Converter
                .doWrite(dataList);
    }

    // POJO 类
    public static class CustomData {
        @ExcelProperty(index = 0)
        private String name1;

        @ExcelProperty(index = 1)
        private String name2;

        @ExcelProperty(index = 2)
        private String name3;

        @ExcelProperty(index = 3)
        private String name4;

        // 构造函数、getter 和 setter 方法
        public CustomData(String name1, String name2, String name3, String name4) {
            this.name1 = name1;
            this.name2 = name2;
            this.name3 = name3;
            this.name4 = name4;
        }
    }

    // 自定义的 Converter 实现
    public static class CustomCSVConverter implements Converter<String> {
        @Override
        public Class supportJavaTypeKey() {
            return String.class;
        }

        @Override
        public String convertToExcelData(String value, com.alibaba.excel.metadata.CellData cellData, com.alibaba.excel.metadata.Head head, com.alibaba.excel.write.metadata.WriteSheet writeSheet) {
            return "\"" + value + "\""; // 将字段值用双引号包裹
        }

        @Override
        public String convertToJavaData(String value, com.alibaba.excel.metadata.CellData cellData, com.alibaba.excel.metadata.Head head, com.alibaba.excel.read.metadata.ReadSheet readSheet) {
            return value; // 不需要实现读取方法
        }
    }
}

现在 4.0.1 版本通过自定义 Conveter 这种方式好像会输出 """