POI导入数据库+SpringMvc

应用场景:

         后台web页面上传数据excel文件,java后端接口实现excel转换到集合中,进行具体业务操作,例批量导入数据库等;

1.maven依赖

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.13</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.13</version>
</dependency>

2.utils类

/**
 * 读取EXCEL文件
 * 
 * @param fielName
 * @return
 */
public List<String> getExcelInfo(String fileName, MultipartFile Mfile) {
   // 把spring文件上传的MultipartFile转换成File
   CommonsMultipartFile cf = (CommonsMultipartFile) Mfile;
   DiskFileItem fi = (DiskFileItem) cf.getFileItem();
   File file = fi.getStoreLocation();
   List<String> userList = new ArrayList<String>();
   InputStream is = null;
   try {
      // 验证文件名是否合格
      if (!validateExcel(fileName)) {
         return null;
      }
      // 判断文件时2003版本还是2007版本
      boolean isExcel2003 = true;
      if (WDWUtil.isExcel2007(fileName)) {
         isExcel2003 = false;
      }
      is = new FileInputStream(file);
      userList = getExcelInfo(is, isExcel2003);
      is.close();
   }
   catch (Exception e) {
      log.getLogger("excelUtil_s").error("getExcelInfo-ex", e.getMessage());
      // e.printStackTrace();
   }
   finally {
      if (is != null) {
         try {
            is.close();
         }
         catch (IOException e) {
            is = null;
            log.getLogger("excelUtil_s").error("FileInputStream-close-fail", e.getMessage());
            // e.printStackTrace();
         }
      }
   }
   return userList;
}

public List<String> getExcelInfo(InputStream is, boolean isExcel2003) {
   List<String> userList = null;
   try {
      Workbook wb = null;
      // 当excel是2003时
      if (isExcel2003) {
         wb = new HSSFWorkbook(is);
      }
      else {
         wb = new XSSFWorkbook(is);
      }
      userList = readExcelValue(wb);
   }
   catch (IOException e) {
      log.getLogger("excelUtil_s").error("readExcel-IOException", e.getMessage());
      // e.printStackTrace();
   }
   return userList;
}

/**
 * 获取Excel的信息:行和列
 * 
 * @param wb
 * @return
 */
private List<String> readExcelValue(Workbook wb) {
   // 得到第一个shell
   Sheet sheet = wb.getSheetAt(0);
   // 得到Excel的行数
   this.totalRows = sheet.getPhysicalNumberOfRows();
   // 得到Excel的列数(前提是有行数)
   if (totalRows >= 1 && sheet.getRow(0) != null) {
      this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
   }
   List<String> userList = new ArrayList<String>();
   String String;
   // 循环row:行
   for (int r = 1; r < totalRows; r++) {
      Row row = sheet.getRow(r);
      if (row == null)
         continue;
      // String = new String();
      // for (int c = 0; c < this.totalCells; c++) {
      // Cell cell = row.getCell(c);
      // if (null != cell) {
      // // 第一列
      // if (c == 0) {
      // String.setUserName(cell.getStringCellValue());
      // }
      // else if (c == 1) {
      // DecimalFormat df = new DecimalFormat("#");
      // String cellValue = df.format(cell.getNumericCellValue());
      // String.setUserNumber(cellValue);
      // }
      // }
      // }
      // 循环每个row的cell:列,本次业务只有一列
      for (int c = 0; c < this.totalCells; c++) {
         Cell cell = row.getCell(c);
         if (null != cell) {
            // 第一列
            if (c == 0 && !"".equals(cell.getStringCellValue())) {
               userList.add(cell.getStringCellValue());// 获取cell中的字符串值(cell提供获取各种类型的api)
            }
         }
         break;
      }
   }
   return userList;
}

/**
 * 验证EXCEL文件
 * 
 * @param filePath
 * @return
 */
public boolean validateExcel(String filePath) {
   if (filePath == null || !(WDWUtil.isExcel2003(filePath) || WDWUtil.isExcel2007(filePath))) {
      errorMsg = "文件名不是excel格式";
      return false;
   }
   return true;
}

// excel 2003
public static boolean isExcel2003(String filePath) {
   return filePath.matches("^.+\\.(?i)(xls)$");
}

// excel 2007
public static boolean isExcel2007(String filePath) {
   return filePath.matches("^.+\\.(?i)(xlsx)$");
}

private int totalRows = 0;
private int totalCells = 0;
private String errorMsg;

public ReadExcelUtil() {
}

public int getTotalRows() {
   return totalRows;
}

public void setTotalRows(int totalRows) {
   this.totalRows = totalRows;
}

public int getTotalCells() {
   return totalCells;
}

public void setTotalCells(int totalCells) {
   this.totalCells = totalCells;
}

public String getErrorMsg() {
   return errorMsg;
}

public void setErrorMsg(String errorMsg) {
   this.errorMsg = errorMsg;
}

3.test

1)postman

2)controller层

/**
     * 批量导入数据
     *
     * @param headerKey 提货码商品编号,inputFile 导入的文件
     * @param request
     * @return
     */
    @RequestMapping(value = "/import.ctrl", produces = "application/json")
    @ResponseBody
    public void importCode(@RequestParam Long headerKey, @RequestParam(required = true) MultipartFile inputFile, HttpServletRequest request) {
        pickCodeService.batchInputCode(inputFile, request, headerKey);
    }

3)service 具体业务的实现

public Map<String, Object> batchInputCode(MultipartFile inputFile, HttpServletRequest request, Long headerKey) {
   Map<String, Object> response = Maps.newHashMap();
   List<String> excel_list = Lists.newArrayList();
   excel_list = this.excelIntoList(inputFile);
   if (excel_list != null && excel_list.size() > 0) {
     //使用获取的数据执行数据库操作
   }
   response.put("status", "success");
   return response;
}

4.参考文章:https://blog.csdn.net/m0_37527542/article/details/74542587