vue实现文件上传功能

 <el-upload  class="upload-demo"  ref="upload"  action="doUpload"  :limit="1"  :file-list="fileList"  :before-upload="beforeUpload">  <el-button slot="trigger" size="small" type="primary">选取文件</el-button>  <a href="./static/moban.xlsx" rel="external nofollow" download="模板"><el-button size="small" type="success">下载模板</el-button></a>  <!-- <el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传到服务器</el-button> -->  <div slot="tip" class="el-upload__tip">只能上传excel文件，且不超过5MB</div>  <div slot="tip" class="el-upload-list__item-name">{{fileName}}</div> </el-upload>  <span slot="footer" class="dialog-footer">  <el-button @click="visible = false">取消</el-button>  <el-button type="primary" @click="submitUpload()">确定</el-button> </span>

beforeUpload(file){  debugger  console.log(file,'文件');  this.files = file;  const extension = file.name.split('.')[1] === 'xls'  const extension2 = file.name.split('.')[1] === 'xlsx'  const isLt2M = file.size / 1024 / 1024 < 5  if (!extension && !extension2) {   this.$message.warning('上传模板只能是 xls、xlsx格式!')   return  }  if (!isLt2M) {   this.$message.warning('上传模板大小不能超过 5MB!')   return  }  this.fileName = file.name;  return false // 返回false不会自动上传  },

submitUpload() {  debugger  console.log('上传'+this.files.name)  if(this.fileName == ""){   this.$message.warning('请选择要上传的文件！')   return false  }  let fileFormData = new FormData();  fileFormData.append('file', this.files, this.fileName);//filename是键，file是值，就是要传的文件，test.zip是要传的文件名  let requestConfig = {   headers: {   'Content-Type': 'multipart/form-data'   },  }  this.$http.post(`/basedata/oesmembers/upload?companyId=`+this.company, fileFormData, requestConfig).then((res) => {   debugger   if (data && data.code === 0) {   this.$message({    message: '操作成功',    type: 'success',    duration: 1500,    onClose: () => {    this.visible = false    this.$emit('refreshDataList')    }   })   } else {   this.$message.error(data.msg)   }  })   }

/**  * 上传文件  */ @PostMapping("/upload") @RequiresPermissions("basedata:oesmembers:upload") public R upload(@RequestParam("file") MultipartFile file, @RequestParam("companyId") Integer companyId) {  System.out.println(companyId);  if (file.isEmpty()) {   throw new RRException("上传文件不能为空");  }  //上传文件 相关逻辑  return R.ok();}