4.若依框架上传文件

1.服务端代码-控制器

  /***  上传文件*/@PostMapping("/upload")@Operation(summary = "上传")public AjaxResult uploadFile(MultipartFile file) throws Exception {try {// 上传文件路径String filePath = RuoYiConfig.getUploadPath();// 上传并返回新文件名称String fileName = FileUploadUtils.upload(filePath, file);String url = serverConfig.getUrl() + fileName;AjaxResult ajax = AjaxResult.success();ajax.put("url", url);ajax.put("fileName", fileName);ajax.put("newFileName", FileUtils.getName(fileName));ajax.put("originalFilename", file.getOriginalFilename());return ajax;} catch (Exception e) {return AjaxResult.error(e.getMessage());}}

2.服务端代码-上传文件的方法

  /*** 文件上传** @param baseDir 相对应用的基目录* @param file 上传的文件* @param allowedExtension 上传文件类型* @return 返回上传成功的文件名* @throws FileSizeLimitExceededException 如果超出最大大小* @throws FileNameLengthLimitExceededException 文件名太长* @throws IOException 比如读写文件出错时* @throws InvalidExtensionException 文件校验异常*/public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,InvalidExtensionException{int fileNamelength = Objects.requireNonNull(file.getOriginalFilename()).length();if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH){throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);}assertAllowed(file, allowedExtension);String fileName = extractFilename(file);String absPath = getAbsoluteFile(baseDir, fileName).getAbsolutePath();file.transferTo(Paths.get(absPath));return getPathFileName(baseDir, fileName);}

3.前端 -JS

// 公共方法-上传文件
export function uploadFile(file) {const formData = new FormData()formData.append('file', file)request({url: '/common/upload',method: 'post',data: formData}).then(res=>{alert(JSON.stringify(res));});}

4.前端-Vue

  <el-table-column prop="date" label="文件模板" width="180"><template slot-scope="scope"><input type="file" @change="fileUploadChange($event)" /></template></el-table-column>

 //文件上传控件改变fileUploadChange(e) {console.log(e);alert(e.target.files[0]);uploadFile(e.target.files[0]).then((res) => {alert(JSON.stringify(res));});},

5. 注意点

前端传值的参数要写成data：xx；不能写成file：xx