一、pom.xml

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.10-FINAL</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.10-FINAL</version>
        </dependency>
 

二、工具類

/**
 * @Descriptiony: 讀取Excel
 * @Author XIAOHUI.XU
 * @Date: Created in 2018/10/23_17:39
 */
@Slf4j
public class ReadExcelUtils {

    private final static String xls = "xls";
    private final static String xlsx = "xlsx";

    /**
     * 讀入excel檔案，解析後返回
     *
     * @param file
     * @throws IOException
     */
    public static List<String[]> readExcel(MultipartFile file) throws IOException {
        //檢查檔案
        checkFile(file);
        //獲得Workbook工作薄物件
        Workbook workbook = getWorkBook(file);
        //建立返回物件，把每行中的值作為一個數組，所有行作為一個集合返回
        List<String[]> list = new ArrayList<>();
        if (workbook != null) {
            for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
                //獲得當前sheet工作表
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if (sheet == null) {
                    continue;
                }
                //獲得當前sheet的開始行
                int firstRowNum = sheet.getFirstRowNum();
                //獲得當前sheet的結束行
                int lastRowNum = sheet.getLastRowNum();
                //迴圈除了第一行的所有行
                for (int rowNum = firstRowNum + 1; rowNum <= lastRowNum; rowNum++) { //為了過濾到第一行因為我的第一行是資料庫的列
                    //獲得當前行
                    Row row = sheet.getRow(rowNum);
                    if (row == null) {
                        continue;
                    }
                    //獲得當前行的開始列
                    int firstCellNum = row.getFirstCellNum();
                    //獲得當前行的列數
                    //為空列獲取
                    int lastCellNum = row.getLastCellNum();
                    String[] cells = new String[row.getLastCellNum()];
                    //迴圈當前行
                    for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
                        Cell cell = row.getCell(cellNum);
                        cells[cellNum] = getCellValue(cell);
                    }
                    list.add(cells);
                }
            }
        }
        return list;
    }

    public static void checkFile(MultipartFile file) throws IOException {
        //判斷檔案是否存在
        if (null == file) {
            throw new FileNotFoundException("檔案不存在！");
        }
        //獲得檔名
        String fileName = file.getOriginalFilename();
        //判斷檔案是否是excel檔案
        if (!fileName.endsWith(xls) && !fileName.endsWith(xlsx)) {
            throw new IOException(fileName + "不是excel檔案");
        }
    }

    public static Workbook getWorkBook(MultipartFile file) {
        //獲得檔名
        String fileName = file.getOriginalFilename();
        //建立Workbook工作薄物件，表示整個excel
        Workbook workbook = null;
        try {
            //獲取excel檔案的io流
            InputStream is = file.getInputStream();
            //根據檔案字尾名不同(xls和xlsx)獲得不同的Workbook實現類物件
            if (fileName.endsWith(xls)) {
                //2003
                workbook = new HSSFWorkbook(is);
            } else if (fileName.endsWith(xlsx)) {
                //2007
                workbook = new XSSFWorkbook(is);
            }
        } catch (IOException e) {
            log.info(e.getMessage());
        }
        return workbook;
    }

    public static String getCellValue(Cell cell) {
        String cellValue = "";
        if (cell == null) {
            return cellValue;
        }
        //把數字當成String來讀，避免出現1讀成1.0的情況
        if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }
        //判斷資料的型別
        switch (cell.getCellType()) {
            case Cell.CELL_TYPE_NUMERIC: //數字
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BLANK: //空值
                cellValue = "";
                break;
            case Cell.CELL_TYPE_ERROR: //故障
                cellValue = "非法字元";
                break;
            default:
                cellValue = "未知型別";
                break;
        }
        return cellValue;
    }
}