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README
Apache-2.0

Express Annotate JS gitee.png github.png

Express Annotate JS 是一个基于 Javascript 中的注解提案 proposal-decoratorsExpress 而实现的一套快速开发的 NodeJS 框架,其注解模块核心基于 Annotate JS

使用条件及环境

  • 依赖项目
    • "@palerock/annotate-js": "^1.2.26"
    • "express": "^4.17.1"
  • 使用前提
    • 熟悉 ES6 或以上的 Javascript 语法
    • 需要对 NodeJS 服务端开发有一定了解
    • 需要对 express 框架有一定了解
    • 需要了解 proposal-decorators 提案以及如何通过 babel 来搭建开发环境
    • 需要了解 Annotate JS 该框架的基本注解用法

快速开始

引入

# 引入依赖
npm install express@4.17.1
npm install @palerock/annotate-js
# 引入 express-annotate-js
npm install @palerock/express-annotate-js

以及一个简单的能够使用 proposal-decorators 提案的开发环境

引入 babel 依赖项目(用于使用注解语法,这步很灵活各种方法都行)

npm install -D @babel/cli
npm install -D @babel/core
npm install -D @babel/plugin-proposal-class-properties
npm install -D @babel/plugin-proposal-decorators
npm install -D @babel/preset-env
npm install -D @babel/register

然后配置 babel 配置文件 .babelrc 在根目录如下

{
  "presets": [
    [
      "@babel/preset-env"
    ]
  ],
  "plugins": [
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    [
      "@babel/plugin-proposal-class-properties",
      {
        "loose": true
      }
    ]
  ]
}

使用

src 目录下新建 index.js 内容如下

import {launcher, GetMapping, Register} from "@palerock/express-annotate-js";
import {Boot, Autowired, Bean} from "@palerock/annotate-js"; 

@Register // 将该 class 注册为 web 服务
class DemoController {

    @Autowired
    DemoService; // 自动注入 Service

    @GetMapping({url: '/'})
    getContent({content}) {
        // 通过参数注入获取请求参数
        return `Hello Express Annotate JS, ${this.DemoService.parseContent(content)}`;
    }

}

@Bean
class DemoService {
    parseContent(content) {
        return `Parsed content: ${content}`;
    }
}

@Boot
class Application {

    port = 3034;

    main() {
        // 启动服务
        launcher.start(this.port);
    }

}

在根目录创建启动文件 launcher.js 如下

require("@babel/register"); // 使用 babel 编译
require("./src/index") // 启动服务

通过命令行 npx node launcher.js 启动服务

运行后在浏览器输入以下链接 http://localhost:3034/?content=Enjoy%20it
将会看到显示如下内容: "Hello Express Annotate JS, Parsed content: Enjoy it"

使用异步方法

Express Annotate JS 同样支持异步,实例如下:

import {launcher, GetMapping, Register} from "@palerock/express-annotate-js";
import {Boot, Autowired, Bean, EnergyWire} from "@palerock/annotate-js"; 

@Register
class AsyncController {

    @Autowired // 注入 APIService
    APIService;

    @GetMapping({url: '/project/:id'}) // 使用 :id 将 URL 中的 id 映射为参数并注入到方法中
    async getProject({id}) {
        return this.APIService.getProjectCache(id);
    }

}

@Bean
class APIService {

    // 注入 Utils 中的 wait 方法
    @EnergyWire('Utils')
    wait;

    // 缓存用于返回
    projectCacheMap = {
        '1': {
            name: 'Project 01'
        },
        '2': {
            name: 'project 02'
        }
    };

    async getProjectCache(id) {
        await this.wait(2000); // 等待 2s 
        if (id in this.projectCacheMap) {
            return this.projectCacheMap[id];
        }
        return null;
    }

}

@Bean
class Utils {
    async wait(ms) {
        return new Promise(resolve => {
            setTimeout(() => resolve(), ms);
        })
    }
}

@Boot
class Application {

    port = 3034;

    main() {
        launcher.start(this.port);
    }

}

启动服务后,浏览器输入 http://localhost:3034/project/1,可以在等待 2s 后看到返回结果:

{"name":"Project 01"}

如上诉例子所见,只需要对指定方法加上 async/await 关键字便可以支持异步方法
于此同时,因为使用的是 Express,所以 URL 的书写方式和 Express 表达一致,/project/:id 表示 RESTFul 规范中 GET 方法中获取资源的映射规则。

文档撰写中,具体详情请参考源码或留言评论

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简介

Express Annotate JS 是一个基于 Javascript 中的注解提案 proposal-decorators 和 Express 而实现的一套快速开发的 NodeJS 框架,其注解模块核心基于 Annotate JS 展开 收起
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