vue 文件上传，供大家参考，具体内容如下

首先 先说一下想要实现的效果

就如截图所见，需要将企业和需要上传的文件提交到后台处理，那么接下来就说如何实现

vue 实现

vue 页面代码

 <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>

上传之前的大小校验

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
 },

手动上传确认提交

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)
 }
 }) 
 }

后台

/**
 * 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();
}