Nestjs 上傳文件

Docs: https://docs.nestjs.com/techniques/file-upload

上傳單文件

import { FileInterceptor } from '@nestjs/platform-express';

  @Post('upload')
  @UseInterceptors(FileInterceptor('file')) // file對應HTML表單的name屬性
  UploadedFile(@UploadedFile() file, @Body() body){
    l(body.name)
    const writeImage = createWriteStream(join(__dirname, '..', 'upload', `${file.originalname}`))
    writeImage.write(file.buffer)
  }

---

上傳文件數組

  @Post('upload')
  @UseInterceptors(FilesInterceptor('files'))
  UploadedFile(@UploadedFiles() files, @Body() body) {
    if (!body.name || files.length === 0) {
      throw new HttpException('請求參數錯誤.', HttpStatus.FORBIDDEN)
    }
    for (const file of files) {
      const writeImage = createWriteStream(join(__dirname, '..', 'upload', `${body.name}-${Date.now()}-${file.originalname}`))
      writeImage.write(file.buffer)
    }
  }

---

上傳多個字段的文件

  @Post('upload')
  @UseInterceptors(FileFieldsInterceptor([{
      name: 'front',
      maxCount: 1
    },
    {
      name: 'back',
      maxCount: 1
    },
  ]))
  UploadedFile(@UploadedFiles() files, @Body() body) {
    if (!body.name || _.isEmpty(files)) {
      throw new HttpException('請求參數錯誤.', HttpStatus.FORBIDDEN)
    }

    _.each(files, (v: any[], k: string) => {
      for (const file of v) {
        const writeImage = createWriteStream(join(__dirname, '..', 'upload', `${body.name}-${k}-${Date.now()}-${file.originalname}`))
        writeImage.write(file.buffer)
      }
    })
  }