Springboot上传excel并将表格数据导入或更新mySql数据库

本文主要描述，Springboot-mybatis框架下上传excel，并将之导入mysql数据库的过程，如果用户id已存在，则进行更新修改数据库中该项信息，由于用到的是前后端分离技术，这里记录的主要是后端java部分，通过与前端接口进行对接实现功能，使用layui等前端框架与之对接，也可以自己写前端代码，本文以Controller开始，从导入过程开始讲述，其中包括字典表的转换

1.在pom.xml文件中导入注解，主要利用POI

<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>

2.Controller接口

	@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";
			
		}
	}

3.服务层接口

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

4.业务层实现类

        @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;
	}