TypeScript NestJS文件上传下载接口

我这里用了mongodb保存文件上传记录 mongoose框架

• 安装依赖

修改package.json 后yarn install

"dependencies": {
    "@grpc/proto-loader": "^0.6.1",
    "@nestjs/common": "^7.6.15",
    "@nestjs/config": "^0.6.3",
    "@nestjs/core": "^7.6.15",
    "@nestjs/microservices": "^7.6.15",
    "@nestjs/mongoose": "^7.2.4",
    "@nestjs/platform-express": "^7.6.15",
    "@nestjs/swagger": "^4.8.0",
    "class-transformer": "^0.4.0",
    "class-validator": "^0.13.1",
    "dayjs": "^1.10.4",
    "grpc": "^1.24.6",
    "md5": "^2.3.0",
    "mongoose": "^5.12.3",
    "nest-winston": "^1.4.0",
    "nuid": "^1.1.4",
    "reflect-metadata": "^0.1.13",
    "rimraf": "^3.0.2",
    "rxjs": "^6.6.6",
    "swagger-ui-express": "^4.1.6",
    "winston": "^3.3.3",
    "winston-daily-rotate-file": "^4.5.1"
  },
  "devDependencies": {
    "@nestjs/cli": "^7.6.0",
    "@nestjs/schematics": "^7.3.0",
    "@nestjs/testing": "^7.6.15",
    "@types/express": "^4.17.11",
    "@types/jest": "^26.0.22",
    "@types/logform": "^1.10.1",
    "@types/node": "^14.14.36",
    "@types/supertest": "^2.0.10",
    "@types/winston": "^2.4.4",
    "@typescript-eslint/eslint-plugin": "^4.19.0",
    "@typescript-eslint/parser": "^4.19.0",
    "eslint": "^7.22.0",
    "eslint-config-prettier": "^8.1.0",
    "eslint-plugin-prettier": "^3.3.1",
    "jest": "^26.6.3",
    "prettier": "^2.2.1",
    "supertest": "^6.1.3",
    "ts-jest": "^26.5.4",
    "ts-loader": "^8.0.18",
    "ts-node": "^9.1.1",
    "tsconfig-paths": "^3.9.0",
    "typescript": "^4.2.3"
  }

• 在app创建的时候加入
  

const app = await NestFactory.create<NestExpressApplication>(AdminModule, {
    
  });
// 静态文件
  app.useStaticAssets(config.uploads, {
    prefix: '/uploads/',
  });

• schema （mongoose的持久化用的） file.log.schema.ts

import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { Document } from 'mongoose';

@Schema({ collection: 't_file_log' })
export class FileLog extends Document {
  @Prop()
  filename: string;
  @Prop()
  path: string;
  @Prop()
  time: number;
}

export const FileLogSchema = SchemaFactory.createForClass(FileLog);

• service file.log.service.ts

import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { FileLog } from "../schema/file.log.schema";

@Injectable()
export class FileLogService {
  constructor(
    @InjectModel('FileLog') private readonly fileLogModel: Model<FileLog>,
  ) {}
  /**
   * 后台管理需要的四个基本接口
   * @param id
   * @param obj
   */
  async adminAdd(obj:object){
    return this.fileLogModel.create(obj)
  }
  async adminUpdate(id:string, obj:object){
    return this.fileLogModel.findByIdAndUpdate(id,obj)
  }
  async adminDelete(id:string){
    return  this.fileLogModel.findByIdAndDelete(id)
  }
  async adminList(current:number, size:number): Promise<FileLog[]> {
    return  this.fileLogModel.find({}).skip((current-1)*size).limit(size);
  }
  async adminCount(){
    return this.fileLogModel.count({})
  }
  /**
   * 后台管理需要的四个基本接口
   */


  async add(obj:object){
    return this.fileLogModel.create(obj)
  }
}

• controller 接口实现

import {
  Controller,
  Post,
  UploadedFiles, UseInterceptors
} from "@nestjs/common";
import {  FilesInterceptor } from "@nestjs/platform-express";
import { FileLogService } from "../service/file.log.service";
import config from "../config";
import { Util } from "../util/Util";
@Controller('file')
export class FileController {
  constructor(private readonly fileLogService: FileLogService) {}
 
  @Post('upload')
  @UseInterceptors(FilesInterceptor('file'))
  async upload(@UploadedFiles() files){
    console.log('收到请求');
    let file = files[0]
    if (file){
      let time = new Date().getTime()
      //文件的真实存储路径
      let path = +'C://uploads/' + Util.getToday() + '/' + file.filename
      //下载这个文件的链接
      let url = 'http://192.168.0.140:3001/uploads/' + Util.getToday() + '/' + file.filename;
        let log = {
          filename: file.originalname,
          path: path,
          time: time
        }
        log = await this.fileLogService.add(log);
        return {
          
          // errno 即错误代码，0 表示没有错误。
          //       如果有错误，errno != 0，可通过下文中的监听函数 fail 拿到该错误码进行自定义处理
          "errno": 0,

          // data 是一个数组，返回图片Object，Object中包含需要包含url、alt和href三个属性,它们分别代表图片地址、图片文字说明和跳转链接,alt和href属性是可选的，可以不设置或设置为空字符串,需要注意的是url是一定要填的。
          "data": [
            {
              url: url,
              alt: file.originalname,
            }
          ]
        };
    }
  }

  
}

• 接口调用了Util.getToday 每天一个文件夹存储，你也可以去掉

// 获取今天日期
  static getToday() {
    const Dates = new Date();
    //年份
    const Year: number = Dates.getFullYear();
    //月份下标是0-11
    const Months: any =
      Dates.getMonth() + 1 < 10
        ? '0' + (Dates.getMonth() + 1)
        : Dates.getMonth() + 1;
    //具体的天数
    const Day: any =
      Dates.getDate() < 10 ? '0' + Dates.getDate() : Dates.getDate();
    //返回数据格式
    return Year + '-' + Months + '-' + Day;
  }