前端

              <el-upload class="upload-demo" :action="item.fileUploadUrl" :show-file-list="false" :limit="1" :multiple="false" :auto-upload="true" :accept="item.accept" :before-upload="beforeUpload"
                :headers="item.uploadHeaders" :data="item.uploadData">上传
              </el-upload></el-button>

     fileActionList: [
        {
          width: 60,
          name: "合同文件",
          fileUploadUrl: "*************/importContract",
          uploadData: {},
          uploadHeaders: {},
          accept: ".doc,.docx,.pdf",
        },
      ],



    beforeUpload(file, fileList) {
      let promise = new Promise((resolve) => {
        this.$nextTick(function () {
          resolve(true);
        });
      });
      this.$message.success("上传成功");

      return promise;
    },
        // 文件上传操作
    handleImport(row) {
      this.fileActionList[0].uploadData = {
        id: row.id,
      };
      this.fileActionList[0].uploadHeaders = {
        Authorization: Cookie.get("*******"),
      };
    },

就是常规的传文件

后端

    @ApiOperation("导入合同文件")
    @PostMapping("importContract")
    public Result importData(@RequestParam(value="file") MultipartFile file, @RequestParam(value="id") Long id) throws Exception {
        return projectService.importData(file, id);
    }
        @Override
    public Result importData(MultipartFile file, Long id) throws Exception {
        //获取文件名
        InputStream path = null;
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            path = file.getInputStream();
            fis = (FileInputStream) path;
            File dir = new File("file/project");
            if (!dir.exists()) {
                dir.mkdirs();
            }
            String filePath = "file/project/" + id + "_" + System.currentTimeMillis() + "_" + file.getOriginalFilename();
            fos = new FileOutputStream(filePath);
            int readlen = 0;
            //字节数组，一次读取8个字节
            byte[] buf = new byte[8];
            while ((readlen = fis.read(buf)) != -1) {
                fos.write(buf, 0, readlen);
            }
            Project project = projectRepo.getById(id);
            project.setContactFile(filePath);
            projectRepo.save(project);
        } catch (IOException e) {
            log.error("" + e);
        } finally {
            path.close();
            fis.close();
            fos.close();
        }
        return Result.success("上传成功");
    }