elementui上传文件到后台，formdata内报错如何解决

HTML

<!-- 弹出上传文件Dialog -->
        <el-dialog title="上传文件" :visible.sync="dialogForm.uploadDialogVisible" width="29%" :close-on-click-modal="false">
          <span>
            <el-upload ref="upload" name="excel" class="upload-demo" :auto-upload="false" action="none" accept=".xls" drag :http-request="uploads">
              <i class="el-icon-upload"></i>
              <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
              <div class="el-upload__tip" slot="tip">只能上传excel文件</div>
            </el-upload>
          </span>
          <span slot="footer" class="dialog-footer">
            <el-button @click="dialogForm.uploadDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="uploadExcel">确 定</el-button>
          </span>
        </el-dialog>

JS

    uploadExcel(e) {
      this.$refs.upload.submit()
    },
    uploads(content) {
      const formData = new FormData()
      // let batch_file = this.fileList[0].raw
      formData.append('files', content.file)
      console.log(content)
      console.log(formData)
      console.log(content.file)
      console.log(this.tableData)
      const config = {
        headers: {
          'Content-Type': 'multipart/form-data',
        },
      }
      axios.post('http://localhost:8080/good/upload', config, formData).then((res) => {
        console.log(res)
      })
    },

后台

    @CrossOrigin
    @RequestMapping("/upload")
    public List<Object> upload(@RequestParam("excel") MultipartFile file) throws IOException {
//        System.out.println(file.toString());
        return goodService.upload(file);
    }

具体报什么错呢？上传文件参数要用formdata.sppend添加参数

代码贴一下

可参考以下博文
https://blog.csdn.net/weixin_45526437/article/details/122395308?spm=1001.2014.3001.5502