MultipartFile 前端接受文件下載到本地

// 必須 @Aoutowired 使用new創建實體無法掃描到配置文件導致為null

@Value("${outpath}")
private String outpath;

@Value("${pdfpath}")
private String pdfpath;

public void upload(MultipartFile filecontent) throws Exception {
    OutputStream os = null;
    InputStream inputStream = null;
    String fileName = null;
    try {
        inputStream = filecontent.getInputStream();
        fileName = filecontent.getOriginalFilename();
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        // 2、保存到臨時文件
        // 1K的數據緩沖
        byte[] bs = new byte[1024];
        // 讀取到的數據長度
        int len;
        // 輸出的文件流保存到本地文件
        File tempFile = new File(pdfpath);
        if (!tempFile.exists()) {
            tempFile.mkdirs();
        }
        os = new FileOutputStream(tempFile.getPath() + File.separator + fileName);
        // 開始讀取
        while ((len = inputStream.read(bs)) != -1) {
            os.write(bs, 0, len);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // 完畢，關閉所有鏈接
        try {
            os.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}