Java后端实现Excel导入导出功能

实现后端Excel文件的导入导出代码,自定义列表实现导出

1、创建excelutil工具类

public class ExcelUtil {
private static final Logger logger = LoggerFactory.getLogger(ExcelUtil.class);
public static void createSheetHead(Sheet sheet, List headList, CellStyle style) {

  Row row = sheet.createRow(0);
  for (int i = 0; i < headList.size(); i++) {
     String headStr = headList.get(i);
     Cell cell = row.getCell(i);
     cell = row.createCell(i);
     cell.setCellValue(headStr);
     cell.setCellStyle(style);
  }

}
public static void createRemark(Sheet sheet, String text, CellStyle style) {

  // 导出描述

int lastRowNum = sheet.getLastRowNum() + 1;

  Row row = sheet.createRow(lastRowNum);
  CellRangeAddress region = new CellRangeAddress(lastRowNum, lastRowNum, 0, 5);
  sheet.addMergedRegion(region);
  ExcelUtil.rowCreateCellData(row, 0, text, style);

}
public static void createRemark(Sheet sheet, String text) {

  // 导出描述

int lastRowNum = sheet.getLastRowNum() + 1;

  Row row = sheet.createRow(lastRowNum);
  CellRangeAddress region = new CellRangeAddress(lastRowNum, lastRowNum, 0, 5);
  sheet.addMergedRegion(region);
  ExcelUtil.rowCreateCellData(row, 0, text);

}
/**

    • 给行新增单元格并插入数据
    • @param row 行队形

      • @param cellIndex 单元格索引
      • @param val 值
      • @param style 单元格格式

      */
      public static void rowCreateCellData(Row row, int cellIndex, String val, CellStyle style) {

       Cell cell = row.createCell(cellIndex);
       cell.setCellStyle(style);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据

      *

      • @param row 行队形
      • @param cellIndex 单元格索引
      • @param val 值

      */
      public static void rowCreateCellData(Row row, int cellIndex, String val) {

       Cell cell = row.createCell(cellIndex);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据
    • @param row 行队形

      • @param cellIndex 单元格索引
      • @param val 值
      • @param style 单元格格式

      */
      public static void rowCreateCellData(Row row, int cellIndex, BigDecimal val, CellStyle style) {

       Cell cell = row.createCell(cellIndex);
       cell.setCellStyle(style);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据

      *

      • @param row 行队形
      • @param cellIndex 单元格索引
      • @param val 值

      */
      public static void rowCreateCellData(Row row, int cellIndex, BigDecimal val) {

       Cell cell = row.createCell(cellIndex);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据

      *

      • @param row 行队形
      • @param cellIndex 单元格索引
      • @param val 值
      • @param style 单元格格式

      */
      public static void rowCreateCellData(Row row, int cellIndex, Double val, CellStyle style) {

       Cell cell = row.createCell(cellIndex);
       cell.setCellStyle(style);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据

      *

      • @param row 行队形
      • @param cellIndex 单元格索引
      • @param val 值

      */
      public static void rowCreateCellData(Row row, int cellIndex, Double val) {

       Cell cell = row.createCell(cellIndex);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据
    • @param row 行队形

      • @param cellIndex 单元格索引
      • @param val 值
      • @param style 单元格格式

      */
      public static void rowCreateCellData(Row row, int cellIndex, Integer val, CellStyle style) {

       Cell cell = row.createCell(cellIndex);
       cell.setCellStyle(style);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行新增单元格并插入数据

      *

      • @param row 行队形
      • @param cellIndex 单元格索引
      • @param val 值

      */
      public static void rowCreateCellData(Row row, int cellIndex, Integer val) {

       Cell cell = row.createCell(cellIndex);
       rowSetCellVal(row, cellIndex, val);

      }
      /**

      • 给行指定单元格set数据
    • @param cellIndex 单元格索引

      • @param val 值

      */
      public static void rowSetCellVal(Row row, int cellIndex, String val) {

       Cell cell = row.getCell(cellIndex);
       cell.setCellType(Cell.CELL_TYPE_STRING);
       cell.setCellValue(val == null ? "" : StringUtils.substring(val, 0, 32766));

      }
      /**

      • 给行指定单元格set数据
    • @param cellIndex 单元格索引

      • @param val 值

      */
      public static void rowSetCellVal(Row row, int cellIndex, Double val) {

       Cell cell = row.getCell(cellIndex);
       cell.setCellType(Cell.CELL_TYPE_NUMERIC);
       cell.setCellValue(val);

      }
      /**

      • 给行指定单元格set数据

      *

      • @param cellIndex 单元格索引
      • @param val 值

      */
      public static void rowSetCellVal(Row row, int cellIndex, BigDecimal val) {

       Cell cell = row.getCell(cellIndex);
       cell.setCellType(Cell.CELL_TYPE_NUMERIC);
       if (val != null) {
          cell.setCellValue(val.doubleValue());
       } else {
          cell.setCellValue(0.00D);
       }

      }
      /**

      • 给行指定单元格set数据
    • @param cellIndex 单元格索引

      • @param val 值

      */
      public static void rowSetCellVal(Row row, int cellIndex, Integer val) {

       Cell cell = row.getCell(cellIndex);
       cell.setCellType(Cell.CELL_TYPE_NUMERIC);
       cell.setCellValue(val == null ? 0 : val);

      }
      public static T getCellValue(Row row, int i, Class classType) {

       Object value = null;
       Cell cell = row.getCell(i);
       if (cell == null) {
          return null;
       }
       if (cell.getCellType() == Cell.CELL_TYPE_STRING || cell.getCellType() == Cell.CELL_TYPE_BLANK) {
          value = cell.getStringCellValue();
       } else {
          if (String.class.getName().equals(classType.getName())) {
             cell.setCellType(CellType.STRING);
             value = cell.getStringCellValue();
          } else {
             value = cell.getNumericCellValue();
          }
       }
       if (value != null) {
          if (String.class.getName().equals(classType.getName())) {
             value = value.toString();
          } else if (Integer.class.getName().equals(classType.getName())) {
             if (Pattern.compile("^+{0,1}[1-9]d*").matcher(String.valueOf(value)).matches()) {
                value = Integer.valueOf(String.valueOf(value));
             } else {
                return null;
             }
          } else if (Double.class.getName().equals(classType.getName())) {
             if (Pattern.compile("[-+]{0,1}d+.d*|[-+]{0,1}d*.d+").matcher(String.valueOf(value)).matches()) {
                value = Double.valueOf(String.valueOf(value));
             }
             return null;
          } else if (BigDecimal.class.getName().equals(classType.getName())) {
             if (Pattern.compile("[-+]{0,1}d+.d*|[-+]{0,1}d*.d+").matcher(String.valueOf(value)).matches()) {
                value = new BigDecimal(String.valueOf(value));
             }
             return null;
          }
       }
       return (T) value;

      }

    }

    导出excel(有三部分,需要定义response响应VO)

    思路:先查出选中的批量数据放进列表,再通过二维数组实现excel行列单元格.

    (1)接口类:定义表头,表格数据列表遍历

    @ResponseBody
    @RequestMapping("/exportToExcel.json")
    @SysLog(module = "商品模块", operationDesc = "导出商品品牌信息")
    public void exportToExcel(HttpServletRequest request, HttpServletResponse response) {
    try {

      String mallId = mallService.selectMallIdByCode(TenantAppCodeUtil.getInstance().getServerTenantAppCode());
      GoodsBrand brand = new GoodsBrand();
      brand.setMallId(mallId);
      List list = goodsBrandService.selectList(brand);
      // excel标题

    String[] title = { "品牌名称 ()", "简要描述", "品牌描述", "是否推荐", "优先级 ()" };

      // excel文件名

    String fileName = "商品品牌" + System.currentTimeMillis() + ".xls";

      // sheet名

    String sheetName = "商品品牌";

      String[][] values = new String[list.size()][];
      if (list != null && list.size() > 0) {
         for (int i = 0; i < list.size(); i++) {
            values[i] = new String[title.length];
            GoodsBrand obj = list.get(i);
            values[i][0] = obj.getBrandName();
            values[i][1] = obj.getBrief();
            values[i][2] = obj.getContent();
            values[i][3] = obj.getIsCommend() == 1 ? "是" : "否";
            values[i][4] = obj.getPriority();
         }
      }
      outPutExcel(response, title, fileName, sheetName, values);

    } catch (Exception e) {

      e.printStackTrace();
      logger.error(e.getMessage(), e);

    }
    }

    (2)输出Excel方法:文件路径、IO操作(调用excelutil工具类方法)

    private void outPutExcel(HttpServletResponse response, String[] title, String fileName, String sheetName, String[][] values) throws IOException {
    // 创建HSSFWorkbook
    HSSFWorkbook wb = ExportExcelUtil.getHSSFWorkbook(sheetName, title, values, null);
    // 将文件存到指定位置
    this.setResponseHeader(response, fileName);
    OutputStream os = response.getOutputStream();
    wb.write(os);
    os.flush();
    os.close();
    }

    (3)发送响应流方法

    public void setResponseHeader(HttpServletResponse response, String fileName) {
    try {

      try {
         fileName = new String(fileName.getBytes(), "ISO8859-1");
      } catch (UnsupportedEncodingException e) {
         e.printStackTrace();
         logger.error(e.getMessage(), e);
      }
      response.setContentType("application/octet-stream;charset=ISO8859-1");
      response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
      response.addHeader("Pargam", "no-cache");
      response.addHeader("Cache-Control", "no-cache");

    } catch (Exception ex) {

      ex.printStackTrace();
      logger.error(ex.getMessage(), ex);

    }
    }

    导入Excel(单步操作就行了)

    思路:先读取文件的每一个单元格,读取进来一条一条写进数据库.

    @RequestMapping("/importExcel.json")
    @ResponseBody
    @SysLog(module = "商品模块", operationDesc = "导入商品品牌")
    public BaseResponseBody importExcel(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request) {
    BaseResponseBody result = null;
    try {

      String mallId = mallService.selectMallIdByCode(TenantAppCodeUtil.getInstance().getServerTenantAppCode());
      String fileName = file.getOriginalFilename();
      Workbook workbook = null;
      // 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 及2007以上

    workbook = new XSSFWorkbook(is);

      }
      // 工作表

    Sheet sheet = workbook.getSheetAt(0);

      // 所有工作行

    int lastRowNum = sheet.getLastRowNum();

      for (int i = 1; i <= lastRowNum; i++) {
         String brandName = null;
         String brief = null;
         String content = null;
         String isCommend = null;
         String priority = null;
         // 每一行

    Row row = sheet.getRow(i);

         if (row == null) {
            break;
         }
         Cell cell0 = row.getCell(0);
         if (cell0 != null) {
            row.getCell(0).setCellType(Cell.CELL_TYPE_STRING);
            brandName = row.getCell(0).getStringCellValue();
            if ("".equals(brandName.trim())) {
               break;
            }
         }
         Cell cell1 = row.getCell(1);
         if (cell1 != null) {
            row.getCell(1).setCellType(Cell.CELL_TYPE_STRING);
            brief = row.getCell(1).getStringCellValue();
         }
         Cell cell2 = row.getCell(2);
         if (cell2 != null) {
            row.getCell(2).setCellType(Cell.CELL_TYPE_STRING);
            content = row.getCell(2).getStringCellValue();
         }
         Cell cell3 = row.getCell(3);
         if (cell3 != null) {
            row.getCell(3).setCellType(Cell.CELL_TYPE_STRING);
            isCommend = row.getCell(3).getStringCellValue();
         }
         Cell cell4 = row.getCell(4);
         if (cell4 != null) {
            row.getCell(4).setCellType(Cell.CELL_TYPE_STRING);
            priority = row.getCell(4).getStringCellValue();
         }
         if (StringUtils.isNotBlank(brandName) && StringUtils.isNotBlank(priority)) {
            GoodsBrand brand = new GoodsBrand();
            brand.setMallId(mallId);
            brand.setBrandName(brandName);
            List brandList = goodsBrandService.selectList(brand);
            if (brandList != null && brandList.size() > 0) {
               return new BaseResponseBody(false, CommonResponseCode.ERROR.getCode(), this.getLocaleMessage(this.getClass(), GoodsResponseMsg.GOODS_BRAND_IMPORT_ERROR_BYSAMENAME.getMsg()), null);
            }
            brand.setBrief(brief);
            brand.setContent(content);
            brand.setStatus(1);
            brand.setIsCommend("否".equals(isCommend) ? 0 : 1);
            brand.setPriority(priority);
            goodsBrandService.insertSelective(brand);
         }
      }
      return new BaseResponseBody(true, CommonResponseCode.SUCCESS.getCode(), this.getLocaleMessage(this.getClass(), GoodsResponseMsg.GOODS_BRAND_IMPORT_SUCCESS.getMsg()), null);

    } catch (Exception e) {

      logger.error(e.getMessage(), e);
      result = new BaseResponseBody(false, CommonResponseCode.ERROR.getCode(), this.getLocaleMessage(this.getClass(), GoodsResponseMsg.GOODS_BRAND_IMPORT_ERROR.getMsg()), e.getMessage(), null);

    }
    return result;
    }

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