package com.bj58.finance.platform.operation.provider.util;import org.apache.log4j.Logger;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Row;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.usermodel.Workbook;import org.apache.poi.util.IOUtils;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import org.springframework.mock.web.MockMultipartFile;import org.springframework.web.multipart.MultipartFile;import java.io.*;import java.util.ArrayList;import java.util.List;/** * excel读写工具类 */public class POIUtil {    private static Logger logger = Logger.getLogger(POIUtil.class);    private final static String xls = "xls";    private final static String xlsx = "xlsx";    /**     * 读入excel文件，解析后返回     *     * @param file     * @throws IOException     */    public static List
     
       readExcel(MultipartFile file) throws IOException {        //检查文件        checkFile(file);        //获得Workbook工作薄对象        Workbook workbook = getWorkBook(file);        //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回        List
      
        list = new ArrayList
       
        ();        if (workbook != null) {            for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {                //获得当前sheet工作表                Sheet sheet = workbook.getSheetAt(sheetNum);                if (sheet == null) {                    continue;                }                //获得当前sheet的开始行                int firstRowNum = sheet.getFirstRowNum();                //获得当前sheet的结束行                int lastRowNum = sheet.getLastRowNum();                //循环除了第一行的所有行                for (int rowNum = firstRowNum + 1; rowNum <= lastRowNum; rowNum++) {                    //获得当前行                    Row row = sheet.getRow(rowNum);                    if (row == null) {                        continue;                    }                    //获得当前行的开始列                    int firstCellNum = row.getFirstCellNum();                    //获得当前行的列数                    int lastCellNum = row.getPhysicalNumberOfCells();                    String[] cells = new String[row.getPhysicalNumberOfCells()];                    //循环当前行                    for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {                        Cell cell = row.getCell(cellNum);                        cells[cellNum] = getCellValue(cell);                    }                    list.add(cells);                }            }            workbook.close();        }        return list;    }    public static void checkFile(MultipartFile file) throws IOException {        //判断文件是否存在        if (null == file) {            logger.error("文件不存在！");            throw new FileNotFoundException("文件不存在！");        }        //获得文件名        String fileName = file.getOriginalFilename();        //判断文件是否是excel文件        if (!fileName.endsWith(xls) && !fileName.endsWith(xlsx)) {            logger.error(fileName + "不是excel文件");            throw new IOException(fileName + "不是excel文件");        }    }    public static Workbook getWorkBook(MultipartFile file) {        //获得文件名        String fileName = file.getOriginalFilename();        //创建Workbook工作薄对象，表示整个excel        Workbook workbook = null;        try {            //获取excel文件的io流            InputStream is = file.getInputStream();            //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象            if (fileName.endsWith(xls)) {                //2003                workbook = new HSSFWorkbook(is);            } else if (fileName.endsWith(xlsx)) {                //2007                workbook = new XSSFWorkbook(is);            }        } catch (IOException e) {            logger.info(e.getMessage());        }        return workbook;    }    public static String getCellValue(Cell cell) {        String cellValue = "";        if (cell == null) {            return cellValue;        }        //把数字当成String来读，避免出现1读成1.0的情况        if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {            cell.setCellType(Cell.CELL_TYPE_STRING);        }        //判断数据的类型        switch (cell.getCellType()) {            case Cell.CELL_TYPE_NUMERIC: //数字                cellValue = String.valueOf(cell.getNumericCellValue());                break;            case Cell.CELL_TYPE_STRING: //字符串                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.getCellFormula());                break;            case Cell.CELL_TYPE_BLANK: //空值                cellValue = "";                break;            case Cell.CELL_TYPE_ERROR: //故障                cellValue = "非法字符";                break;            default:                cellValue = "未知类型";                break;        }        return cellValue;    }    public static void main(String[] args) {        File file = new File("D://新增产品支持的银行列表模板.xlsx");        FileInputStream input = null;        try {            input = new FileInputStream(file);            MultipartFile multipartFile = new MockMultipartFile("file", file.getName(), "text/plain", IOUtils.toByteArray(input));            List
        
          list = readExcel(multipartFile);            System.out.println(list);        } catch (Exception e) {            e.printStackTrace();        }    }}
        
       
      
     

需要引入的Maven依赖：

                 
      
       org.apache.poi
                  
      
       poi
                  
      
       3.14
              
             
                 
      
       org.apache.poi
                  
      
       poi-ooxml
                  
      
       3.14
              
             
                 
      
       org.springframework
                  
      
       spring-test
                  
      
       4.2.5.RELEASE