小满nestjs（第十三章 nestjs 上传图片-静态目录）

Nestjs 上传图片

1.主要会用到两个包

multer   @nestjs/platform-express nestJs自带了

multer   @types/multer 这两个需要安装

在upload  Module 使用MulterModule register注册存放图片的目录

需要用到  multer 的  diskStorage 设置存放目录 extname 用来读取文件后缀 filename给文件重新命名

import { Module } from '@nestjs/common';
import { UploadService } from './upload.service';
import { UploadController } from './upload.controller';
import { MulterModule } from '@nestjs/platform-express'
import {diskStorage} from 'multer'
import { extname,join } from 'path';
@Module({
  imports: [MulterModule.register({
     storage:diskStorage({
        destination:join(__dirname,"../images"),
        filename:(_,file,callback) => {
           const fileName = `${new Date().getTime() + extname(file.originalname)}`
           return callback(null,fileName)
        }
     })
  })],
  controllers: [UploadController],
  providers: [UploadService]
})
export class UploadModule { }

2.controller 使用

使用 UseInterceptors 装饰器  FileInterceptor是单个 读取字段名称  FilesInterceptor是多个

参数 使用 UploadedFile 装饰器接受file 文件

import { Controller, Get, Post, Body, Patch, Param, Delete,UseInterceptors,UploadedFile } from '@nestjs/common';
import { UploadService } from './upload.service';
import {FileInterceptor} from '@nestjs/platform-express'
@Controller('upload')
export class UploadController {
  constructor(private readonly uploadService: UploadService) {}
  @Post('album')
  @UseInterceptors(FileInterceptor('file'))
  upload (@UploadedFile() file) {
    console.log(file)
    return true
  }
}

3.生成静态目录访问上传之后的图片

useStaticAssets prefix 是虚拟前缀

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import {NestExpressApplication} from '@nestjs/platform-express'
import { join } from 'path'
async function bootstrap() {
  const app = await NestFactory.create<NestExpressApplication>(AppModule);
  app.useStaticAssets(join(__dirname,'images'),{
     prefix:"/xiaoman"
  })
  await app.listen(3000);
}
bootstrap();