实现多个csv文件导出

public R<Boolean> exportCsv(HttpServletResponse response, @RequestBody DrQueryDto queryDto) throws Exception {
        Integer countyId = queryDto.getCountyId();
        String yearAnnual = queryDto.getYearAnnual();
        String url = "E:\\" + queryDto.getCountyName() + "\\";
        String urlCounty = "E:\\" + queryDto.getCountyName();
        File fileCounty = new File(urlCounty);
        if (!fileCounty.exists()) {
            fileCounty.mkdir();
        }
        File fi = new File(url);
        if (!fi.exists()) {
            fi.mkdir();
        }
        Map<String, List<String[]>> exportData = workService.exportCSV(countyId, yearAnnual);
        Set<String> keySet = exportData.keySet();
        for (String s : keySet) {
            String csvFileName = s + ".csv";
            File file = new File(url + csvFileName);
            if (!file.exists()) {
                file.createNewFile();
            }
            CSVWriter csvWriter = new CSVWriter(new FileWriter(url + csvFileName));
            String[] title = {"name", "value"};
            // 添加第一行到CSV文件
            csvWriter.writeNext(title,false);
            List<String[]> list = exportData.get(s);
            if (CollectionUtils.isNotEmpty(list)) {
                for (int i = 0; i < list.size(); i++) {
　　　　　　　　　　　　//false:格式不包含双引号，true：包含双引号 默认值为false
                    csvWriter.writeNext(list.get(i),false);
                }
            }
            csvWriter.close();
        }
        return R.ok(true);
    }