How to upload files in vue.js

Vue.js method of uploading files: You can use the FormData object to implement file upload. The FormData object can assemble a set of key/value pairs for sending requests using XMLHttpRequest. It can send form data flexibly and conveniently.

• This method is suitable for all brands of computers

vue.js upload File method:

First let’s talk about the effect you want to achieve

As you can see in the screenshot, you need to enter the company and the file you want to upload. The file is submitted to the background for processing, then let’s talk about how to implement

vue to implement

vue page code

<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>

Size verification before uploading

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.$message.warning(&#39;上传模板只能是 xls、xlsx格式!&#39;)
  return
 }
 if (!isLt2M) {
  this.$message.warning(&#39;上传模板大小不能超过 5MB!&#39;)
  return
 }
 this.fileName = file.name;
 return false // 返回false不会自动上传
 },

Manual upload confirmation submission

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)
  }
 }) 
 }

Backstage

/**
 * 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();
}

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