最近做一個專案，遇到excel上傳問題，在此記錄下問題以及解決方案。由於開發全棧，前端後端都要寫，前端使用vue+element.ui，沒有使用官方推薦的那一套寫法。而是用了最傳統的方法，程式碼如下： 由於接觸vue不深，可能寫的不太好。下面是後端程式碼，由於客戶需求，excel有三種不同的格式，.xls、.xlsx、.cxv。在網上找了一些資料，使用poj解析.xls和.xlsx，都是這樣寫：

 Workbook book = null; 
        try { 
            book = new XSSFWorkbook(excelFile); 
        } catch (Exception ex) { 
            book = new HSSFWorkbook(new FileInputStream(excelFile)); 
        } 
 

但是卻報錯：org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF) 然後發現自己用的是poi3.7版本。對於.xls和.xlsx都要用 book = new XSSFWorkbook(excelFile); 才能解析程式碼如下:`@Override public String uploadExcel(String base64, String fileType, String fileName) { String path = “E:\Leezai\agros\agros\WebRoot\doc\knowledge\uploadExcel”; try { BASE64Decoder decoder = new BASE64Decoder();

        // 獲取檔案的編碼（不包含檔案型別）
        String fileStr = base64.substring(base64.indexOf(",") + 1);
        // 得到檔案路徑
        fileName = fileName + "." + fileType;
        path = path + "/" + fileName;
        // 將編碼轉換並且輸出到檔案中
        byte[] b = decoder.decodeBuffer(fileStr);
        for (int i = 0; i < b.length; i++) {
            if (b[i] < 0) {
                b[i] += 256;
            }
        }
        OutputStream os = new FileOutputStream(path);
        os.write(b);
        os.flush();
        os.close();

    } catch (IOException e) {
        e.printStackTrace();
    }
    return path;
}

// 匯入excel資料到資料庫1,將excel資料儲存到map
public List<Map<String, String>> excelToList(String path, String fileType) {
    boolean flag = true;
    List<Map<String, String>> list = new ArrayList<>();
    if (fileType.equals("xls") || fileType.equals("xlsx")) {
        list = getListOfXlsx(path);
    } else if (fileType.equals("csv")) {
        list = getListOfCsv(path);
    }
    return list;
}

private List<Map<String, String>> getListOfXlsx(String path) {
    Workbook wb = null;
    Sheet sheet = null;
    List<Map<String, String>> list = new ArrayList<>();
    Row row = null;
    InputStream is = null;
    String columns[] = {"cropname", "periodname", "climatename", "effect", "advise"};
    try {
        is = new FileInputStream(path);
        wb = new XSSFWorkbook(is);

        sheet = wb.getSheetAt(0);
        // 獲取最大行數
        int rownum = sheet.getPhysicalNumberOfRows();
        // 獲取第一行
        row = sheet.getRow(0);
        // 獲取最大列數
        int colnum = row.getPhysicalNumberOfCells();
        String cellData = null;
        for (int i = 1; i < rownum; i++) {
            Map<String, String> map = new LinkedHashMap<>();
            row = sheet.getRow(i);
            if (row != null) {
                for (int j = 0; j < colnum; j++) {
                    if (row.getCell(j) != null && row.getCell(j).getStringCellValue() != null) {
                        cellData = row.getCell(j).getStringCellValue();
                        map.put(columns[j], cellData);
                    } else {
                        map.put(columns[j], "無");
                    }
                }
            } else {
                break;
            }
            list.add(map);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return list;
}
 

` 這樣就可以了