NestJS 用TypeScript开发 nodeJS后端

NestJS

A progressive Node.js framework for building efficient and scalable server-side applications on top of TypeScript & JavaScript (ES6 / ES7 / ES8) heavily inspired by Angular

底层用 express

设计理念

这个后端框架受 Angular 启发 , 所以业务代码看起来和 Angular一样

完全基于typescript的web框架，完全oop风格

底层是 express，如果是koa，或者fastify的话，或许会比较火

2018-01-05

官网

https://nestjs.com/

Nest官方叫我们去看Angular 的依赖注入的文档

Nest is built around the strong design pattern commonly known as Dependency Injection. There's a great article about this concept in the official Angular documentation.

根据类型注入 , 不能根据 key

公司

已经很好用了 , 但是不确定是否这么强大 : 高级的功能

官方提供的ORM

分布式微服务

官方有提供 :

命令行工具

示例代码

https://github.com/nestjs/nest.git

E:NestJS estexamples

框架源码

https://github.com/nestjs/nest.git

components 注解相当于 Spring 的 @Service

最后在模块里配置一下 , 相当于Spring 的 xml 配置

import { Module } from '@nestjs/common';
import { CatsController } from './cats/cats.controller';
import { CatsService } from './cats/cats.service';

@Module({
    controllers: [CatsController],
    components: [CatsService],
})
export class ApplicationModule {}

9

 

1

import { Module } from '@nestjs/common';

2

import { CatsController } from './cats/cats.controller';

3

import { CatsService } from './cats/cats.service';

4

5

@Module({

6

    controllers: [CatsController],

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    components: [CatsService],

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})

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export class ApplicationModule {}

实践

npm start 或者 npm run start

默认在 3000 端口

npm start

> nest-typescript-starter@1.0.0 start E:NestJS
estexamples1-cats-app
> node index.js

[Nest] 12736   - 2018-1-5 09:11:29   [NestFactory] Starting Nest application...
[Nest] 12736   - 2018-1-5 09:11:29   [InstanceLoader] ApplicationModule dependencies initialized +7ms
[Nest] 12736   - 2018-1-5 09:11:29   [InstanceLoader] CatsModule dependencies initialized +2ms
[Nest] 12736   - 2018-1-5 09:11:29   [RoutesResolver] CatsController {/cats}: +29ms
[Nest] 12736   - 2018-1-5 09:11:29   [RouterExplorer] Mapped {/, POST} route +1ms
[Nest] 12736   - 2018-1-5 09:11:29   [RouterExplorer] Mapped {/, GET} route +0ms
[Nest] 12736   - 2018-1-5 09:11:29   [RouterExplorer] Mapped {/:id, GET} route +1ms
[Nest] 12736   - 2018-1-5 09:11:29   [NestApplication] Nest application successfully started +1ms

x

 

1

npm start

2

3

> nest-typescript-starter@1.0.0 start E:NestJS
estexamples1-cats-app

4

> node index.js

5

6

[Nest] 12736   - 2018-1-5 09:11:29   [NestFactory] Starting Nest application...

7

[Nest] 12736   - 2018-1-5 09:11:29   [InstanceLoader] ApplicationModule dependencies initialized +7ms

8

[Nest] 12736   - 2018-1-5 09:11:29   [InstanceLoader] CatsModule dependencies initialized +2ms

9

[Nest] 12736   - 2018-1-5 09:11:29   [RoutesResolver] CatsController {/cats}: +29ms

10

[Nest] 12736   - 2018-1-5 09:11:29   [RouterExplorer] Mapped {/, POST} route +1ms

11

[Nest] 12736   - 2018-1-5 09:11:29   [RouterExplorer] Mapped {/, GET} route +0ms

12

[Nest] 12736   - 2018-1-5 09:11:29   [RouterExplorer] Mapped {/:id, GET} route +1ms

13

[Nest] 12736   - 2018-1-5 09:11:29   [NestApplication] Nest application successfully started +1ms

有请求路由的信息 , 比如

/cats

暂时没数据

要发POST请求创建数据 , 角色是 admin , 不然不能添加数据

@UseGuards(RolesGuard)

然后get再获取一次

Guards are executed after every middleware, but before pipes.

为什么要用 Guards ? 之前已经用了 middleware

项目加载顺序

从左到右

来自为知笔记(Wiz)