Springboot上传excel并将表格数据导入或更新mySql数据库的过程

<dependency>   <groupId>org.apache.poi</groupId>   <artifactId>poi-ooxml</artifactId>   <version>3.9</version> </dependency> <dependency>   <groupId>commons-fileupload</groupId>   <artifactId>commons-fileupload</artifactId>   <version>1.3.1</version> </dependency> <dependency>   <groupId>commons-io</groupId>   <artifactId>commons-io</artifactId>   <version>2.4</version> </dependency> 

@PostMapping("/save") public String addUser(@RequestParam("file") MultipartFile file) {  String fileName = file.getOriginalFilename();  try {   return sysService.batchImport(fileName, file);  } catch (MyException e) {   e.printStackTrace();   return e.getMessage();  }catch(Exception e){   e.printStackTrace();   return "文件异常,导入失败";     } } 

boolean import(String fileName, MultipartFile file) throws Exception; 

@Transactional(readOnly = false,rollbackFor = Exception.class) @Override public boolean import(String fileName, MultipartFile file) throws Exception {  Map<String, Integer> departmentMap = findDepartment();  Map<String, Integer> roleMap = findRole();  boolean notNull = false;   List<User> userList = new ArrayList<User>();  if (!fileName.matches("^.+//.(?i)(xls)$") && !fileName.matches("^.+//.(?i)(xlsx)$")) {    throw new MyException("上传文件格式不正确");  }  boolean isExcel2003 = true;  if (fileName.matches("^.+//.(?i)(xlsx)$")) {   isExcel2003 = false;  }  InputStream is = file.getInputStream();   Workbook wb = null;   if (isExcel2003) {    wb = new HSSFWorkbook(is);   } else {    wb = new XSSFWorkbook(is);   }   Sheet sheet = wb.getSheetAt(0);   if(sheet!=null){    notNull = true;   }  User user;  for (int r = 1; r <= sheet.getLastRowNum(); r++) {   Row row = sheet.getRow(r);   if (row == null){    continue;   }   user = new User();   if( row.getCell(0).getCellType() !=1){    throw new MyException("导入失败(第"+(r+1)+"行,ID单元格格式请设为文本格式)");   }   String id = row.getCell(0).getStringCellValue();   if(id==null || id.isEmpty()){     throw new MyException("导入失败(第"+(r+1)+"行,ID未填写)");   }   String name = row.getCell(1).getStringCellValue();   if(name==null || name.isEmpty()){     throw new MyException("导入失败(第"+(r+1)+"行,姓名未填写)");   }   String department = row.getCell(2).getStringCellValue();   if(departmentMap.get(department)==null){     throw new MyException("导入失败(第"+(r+1)+"行,不存在此单位或单位未填写)");   }   String role = row.getCell(3).getStringCellValue();   if(roleMap.get(role)==null){    throw new MyException("导入失败(第"+(r+1)+"行,不存在此角色或角色未填写)");   }   Date date;   if(row.getCell(4).getCellType() !=0){    throw new MyException("导入失败(第"+(r+1)+"行,入职日期格式不正确或未填写)");    }else{      date = row.getCell(4).getDateCellValue();    }    user.setId(id);    user.setName(name);    user.setDepartmentId((int) departmentMap.get(department));    user.setRoleId((int) roleMap.get(role));    user.setDate(date);    userList.add(user);   }  for (User user : userList) {   String id = user.getId();   int cnt = userMapper.selectById(id);   if (cnt == 0) {    userMapper.addUser(user);   } else {    userMapper.updateUserById(user);   }  }  return notNull; }