直接上程式碼

POM.XML 這裡只是主要的jar

<dependency>
	<groupId>net.sf.supercsv</groupId>
	<artifactId>super-csv</artifactId>
	<version>2.4.0</version>
</dependency>

/**
     * 匯出csv檔案
     *
     * @param fileName 要匯出的檔名（包含路徑）
     * @param content
     * 內容
     * @throws IOException
     */
    public boolean exportToCsv(String fileName, List<String[]> content){
        log.info("轉化csv開始：fileName: " + fileName + "，data個數：" + content.size());
        if (!fileName.endsWith(".csv")) {
            log.error("fileName有誤，需要以.csv結尾！");
            return false;
        }
        boolean result = false;
        ICsvListWriter writer = null;
        InputStream in = null;
        File file = null;
        try {
            file = new File(fileName);
            String[] header = getHeaderFromTemplate();
            log.info("從模版中獲取head個數：" + header.length);
            writer = new CsvListWriter(new FileWriter(file), CsvPreference.EXCEL_PREFERENCE);
            if (header.length > 0){
                writer.writeHeader(header);
            }
            for (String[] array : content) {
                for (int i=0;i<array.length;i++){
                    if (isNumeric(array[i])){
                        array[i] = array[i] + "\t";
                    }
                }
                writer.write(array);
            }
            in = new FileInputStream(file);
            writer.flush();
            fileStreamUpload.uploadFile(in, fileName);
            log.info("匯出csv結束");
            result = true;
            file.delete();
        }catch (Exception e){
            log.error("匯出csv異常，異常原因：" + e.getMessage());
            e.printStackTrace();
        }finally {
            IOUtils.closeQuietly(writer);
            IOUtils.closeQuietly(in);
            file.delete();
        }
        return result;
    }


/**
     * 獲取excel模板中獲取 header
     * @return
     */
    private static String[] getHeaderFromTemplate() {
        log.info("從模版中獲取header開始");
        List<String> headerList = new ArrayList<>();
        Sheet sheet = null;
        Row row = null;
        Row rowHeader = null;
        Workbook wb = null;

        InputStream is = null;
        try {
            is = ExcelExportUtil.class.getResourceAsStream("/template/policy_Template.xlsx");
            wb = new XSSFWorkbook(is);
            // 用來存放表中資料
            // 獲取第一個sheet
            sheet = wb.getSheetAt(0);
            // 獲取第一行
            rowHeader = sheet.getRow(0);
            row = sheet.getRow(0);
            // 獲取最大列數
            int colnum = row.getPhysicalNumberOfCells();

            for (int j = 0; j < colnum; j++) {
                headerList.add(rowHeader.getCell(j).getStringCellValue());
            }

        } catch (FileNotFoundException e) {
            log.error("/template/policy_Template.xlsx，模版檔案不存在！");
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            IOUtils.closeQuietly(is);
            IOUtils.closeQuietly(wb);
        }
        return headerList.toArray(new String[headerList.size()]);
    }

/***
     * 判斷字串是否為數字（包含小數點）
     * @param str
     * @return
     */
    private static boolean isNumeric(String str){
        Pattern pattern = Pattern.compile("[0-9]+\\.*[0-9]*");
        Matcher isNum = pattern.matcher(str);
        if( !isNum.matches() ){
            return false;
        }
        return true;
    }