直接上代码吧

 <el-dialog :title="'添加'" :visible.sync="formVisibleAdd" :close-on-click-modal="false" width="30%" @close="closeDialogAdd">
  <el-form :model="addForm" label-width="100px" :rules="rules" ref="addForm">
   <el-form-item label="名称" prop="name">
    <el-input v-model="addForm.name" placeholder="请输入名称" />
   </el-form-item>

   <el-form-item label="编号" prop="code">
    <el-input type="text" v-model="addForm.code" placeholder="请输入编号" />
   </el-form-item>

   <el-form-item label="图片">
    <el-upload accept="image/jpeg,image/jpg,image/png" :auto-upload="false" ref="upload" action="" :on-change="uploadSectionFile" :on-remove="removeImage" list-type="picture">
     <el-button size="small" type="primary" v-show="isUploadShowHide">点击上传</el-button>
     <div slot="tip" v-show="isUploadShowHide" >只能上传jpg/png文件，且不超过500kb</div>
    </el-upload>

   </el-form-item>

  </el-form>
  <div slot="footer" >
   <el-button @click="closeDialogAdd">取消</el-button>
   <el-button type="primary" @click.native="handleSubmitAdd" :loading="formLoading">提交</el-button>
  </div>
 </el-dialog>


let handleSubmitAdd = function() {

 if (this.formLoading) {
  return
 }

 this.$refs.addForm.validate(valid => {
  if (!valid) {
   return
  }
  this.formLoading = true

  var formData = new FormData;
  formData.append('name', this.addForm.name);
  formData.append('code', this.addForm.code);
  formData.append('file', this.uploadFile);

  let config = {
   headers: {
    'Content-Type': 'multipart/form-data'
   }
  };

  this.$axios.post('http://localhost:8090/xx/xx/insert', formData, config)
   .then((res) => {
    if (res.data.code === 0) {

     this.formLoading = false
     this.$refs.upload.clearFiles();
     this.formVisibleAdd = false

    }
   })
   .catch((res) => {
   })
 })

}


@PostMapping(value = "insert", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
  public CommResult insertTableTeam(HttpServletRequest request, 
                                      @RequestParam(value = "name", required = false) String name,
                                      @RequestParam(value = "code", required = false) String code,
                   @RequestParam(value = "file", required = false) MultipartFile file) {


    String rootPath = request.getSession().getServletContext().getRealPath("/");
    if (file != null) {
      String fileName = file.getOriginalFilename();
      if (fileName != null && fileName.trim().length() > 0) {
        String newFileName = FileUtil.uploadFile(rootPath, fileName, file);

      }
    }
        //TODO 添加
    return "success";
  }