vue.js如何上传文件

<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();

}