Java Spring boot convert Multipart file to a file

 In this article, we will learn how can we convert a Multipart file into a file. Sometimes, we need to convert a Multipart file to a file for some reason, In my case, when I was trying to covert xl data to a model list that time I needed to convert a multipart file to a file because in the Poiji package it doesn't support Multipart file format.

Now we will show with controller how can we convert a Multipart file into a file.

CODE:

/**

     * @aurthor fahad

     * @date 08-06-2022

     * @description insert data from xl file.

     * @param fileName

     * @param contractId

     * @return

     */

    @PostMapping("/importDataFromXlfile")

    @ResponseBody

    public CommonResult<String> importFromXl(@RequestParam MultipartFile fileName,                       @RequestParam Integer contractId) {

        try {

            //this part is convert code you can ignore other code

            File convFile = new File(fileName.getOriginalFilename());

            FileOutputStream fos = new FileOutputStream(convFile);

            fos.write(fileName.getBytes());

            fos.close();

            List<PmsContractArrival> invoices = Poiji.fromExcel(convFile, PmsContractArrival.class);

            for (PmsContractArrival pca : invoices) {

                PmsContractArrival pmsContractArrival = new PmsContractArrival();

                pmsContractArrival.setContractId(contractId);

                pmsContractArrival.setCabinetNumber(pca.getCabinetNumber());

                pmsContractArrival.setFurQuantity(pca.getFurQuantity());

                pmsContractArrival.setBoardQuantity(pca.getBoardQuantity());

                pmsContractArrival.setGrossWeight(pca.getGrossWeight());

                pmsContractArrival.setFurWeight(pca.getFurWeight());

                if (pca.getHalalString() != "" || pca.getHalalString() != null) {

                    pmsContractArrival.setHalal(true);

                } else {

                    pmsContractArrival.setHalal(false);

                }

                if (!pmsContractArrivalService.save(pmsContractArrival)) {

                    return CommonResult.failed("failed");

                }

            }

            return CommonResult.success("success");

        } catch (Exception e) {

            return CommonResult.failed("failed");

        }

    }

Note: This is my own project's code, you can just use convert code into your project and ignore other code. If you want a full tutorial you can let me know in the comment section. I will write an article with full code. This is just about converting.