Spring Boot + EasyExcel + SqlServer 进行批量处理数据的高效方法

        <!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.3.2</version>
        </dependency>

 @PostMapping("/importExcelUpdateFlag")
    public Map<String,Object> importExcelUpdateFlag(@RequestBody MultipartFile file) {
           //具体代码......
    }

@PostMapping("/importExcelUpdateFlag")
    public Map<String,Object> importExcelUpdateFlag(@RequestBody MultipartFile file) {
        //把前端发来的文件数据,传到本机指定的 uploadPath 目录之下
        String pathAndFileName = jdCloudService.uploadFile(file,uploadPath);
         //其他代码....
    }

    @Override
    public String uploadFile(MultipartFile file, String uploadPath) {
        if(file.isEmpty()){
            return "上传文件为空";
        }
        try {
            String originalFilename = StringUtils.cleanPath(file.getOriginalFilename());
            String fileExtension = originalFilename.substring(originalFilename.lastIndexOf("."));
            String newFilename = generateFilename() + fileExtension;
            File targetFile = new File(uploadPath + File.separator + newFilename);
            file.transferTo(targetFile);
            return uploadPath + "\\" + newFilename;
        } catch (Exception e) {
            return "文件上传失败: " +  e.getMessage();
        }
    }
    private String generateFilename() {
        // 根据你的需求生成新的文件名，例如使用时间戳或随机字符串等,这里使用时间戳
        return String.valueOf("更新文件名.." + System.currentTimeMillis());
    }

    @PostMapping("/importExcelUpdateFlag")
    public Map<String,Object> importExcelUpdateFlag(@RequestBody MultipartFile file) {
        Map<String,Object> response = new HashMap<>();
        response.put("code",0);
        response.put("data",":");
        //把前端发来的文件数据,传到本机指定的 uploadPath 目录之下
        String pathAndFileName = jdCloudService.uploadFile(file,uploadPath);
        if(pathAndFileName.equals("上传文件为空") || pathAndFileName.equals("文件上传失败")) {
            response.put("msg",pathAndFileName);
            return response;
        }
        String feedBackMsg = jdCloudService.enableFlagUpdate(pathAndFileName);
        response.put("msg",feedBackMsg);
        return response;
    }

    @Override
    public String enableFlagUpdate(String filename) {
        //获取 PersonSynData 类的 Class 对象。
        Class<PersonSynData> head = PersonSynData.class;
        List<PersonSynData> updateList = new ArrayList<>();
        ExcelReader excelReader = EasyExcel.read(filename, head, new AnalysisEventListener<PersonSynData>() {
            @Override
            public void invoke(PersonSynData personSynData, AnalysisContext analysisContext) {
                updateList.add(personSynData);
            }
            @Override
            public void doAfterAllAnalysed(AnalysisContext analysisContext) {
                System.out.println("Excel解析完成......");
            }
        }).build();
        //创建 sheet 对象,并且读取Excel的第一个sheet(下表从0开始),也可以根据 sheet 名称获取
        ReadSheet readSheet = EasyExcel.readSheet(0).build();
        //读取 sheet 表格数据,参数是可变参数,也可以读取多个sheet
        //这个操作会读取 excel 表格的数据
        excelReader.read(readSheet);
        //需要自己关闭流操作,在读取文件的时候会创建临时文件,如果不关闭的话,会损耗磁盘
        excelReader.finish();
    }