如何将 SockJS 添加到 Angular 2 项目中? [英] How to add SockJS into Angular 2 project?

问题描述

我使用 angular-cli 生成一个新项目.现在我想将 socketJs 添加到项目中，但在浏览器控制台中不断出现错误:

I use angular-cli to generate a new project. Now I want to add socketJs to the project, but keep getting errors in browser console:

GET http://localhost:4200/url-parse 404 (Not Found)
GET http://localhost:4200/inherits 404 (Not Found)
Unhandled Promise rejection: Error: XHR error (404 Not Found) loading http://localhost:4200/url-parse
        at XMLHttpRequest.wrapFn [as _onreadystatechange] (http://localhost:4200/vendor/zone.js/dist/zone.js:769:30)
        at ZoneDelegate.invokeTask (http://localhost:4200/vendor/zone.js/dist/zone.js:356:38)
        at Zone.runTask (http://localhost:4200/vendor/zone.js/dist/zone.js:256:48)
        at XMLHttpRequest.ZoneTask.invoke (http://localhost:4200/vendor/zone.js/dist/zone.js:423:34)
    Error loading http://localhost:4200/url-parse as "url-parse" from http://localhost:4200/vendor/sockjs-client/lib/main.js ; Zone: <root> ; Task: Promise.then ; Value: Error: Error: XHR error (404 Not Found) loading http://localhost:4200/url-parse(…)
Error: Uncaught (in promise): Error: Error: XHR error (404 Not Found) loading http://localhost:4200/url-parse(…)
GET http://localhost:4200/json3 404 (Not Found)
GET http://localhost:4200/debug 404 (Not Found)
GET http://localhost:4200/events 404 (Not Found)
GET http://localhost:4200/eventsource 404 (Not Found)
GET http://localhost:4200/crypto 404 (Not Found)
GET http://localhost:4200/json3 404 (Not Found)
GET http://localhost:4200/url-parse 404 (Not Found)
GET http://localhost:4200/debug 404 (Not Found)
GET http://localhost:4200/inherits 404 (Not Found)
Assertion failed: loading or loaded
GET http://localhost:4200/events 404 (Not Found)
Assertion failed: loading or loaded
GET http://localhost:4200/faye-websocket 404 (Not Found)
Assertion failed: loading or loaded
GET http://localhost:4200/eventsource 404 (Not Found)
Assertion failed: loading or loaded
GET http://localhost:4200/http 404 (Not Found)
GET http://localhost:4200/https 404 (Not Found)

这是我的步骤和配置:

typings install sockjs-client --save --ambient

angular-cli-build.js

angular-cli-build.js

var Angular2App = require('angular-cli/lib/broccoli/angular2-app');

module.exports = function(defaults) {
  return new Angular2App(defaults, {
    vendorNpmFiles: [
      'systemjs/dist/system-polyfills.js',
      'systemjs/dist/system.src.js',
      'zone.js/dist/**/*.+(js|js.map)',
      'es6-shim/es6-shim.js',
      'reflect-metadata/**/*.+(ts|js|js.map)',
      'rxjs/**/*.+(js|js.map)',
      '@angular/**/*.+(js|js.map)',
      'sockjs-client/**/*.+(js)'
    ]
  });
};

system-config.ts

system-config.ts

/** Map relative paths to URLs. */
const map: any = {
  'sockjs-client': 'vendor/sockjs-client/lib/entry.js'
};

/** User packages configuration. */
const packages: any = {
  'vendor/sockjs-client/lib': {
    'format': 'cjs',
    'defaultExtension': 'js'
  }
};

我的自定义服务类:

import { Injectable } from '@angular/core';

import * as SockJS from 'sockjs-client';
import BaseEvent = __SockJSClient.BaseEvent;
import SockJSClass = __SockJSClient.SockJSClass;

@Injectable()
export class WebsocketService {

  private sockJs: SockJSClass;

  constructor() {
    console.log('constuctor');
    this.sockJs = new SockJS('/hello');
  }
}

请告诉我如何修复它，非常感谢！

Please let me know how to fix it, thanks a lot!

然而，我可以通过在 system-config.ts 中一一添加缺失的 lib 来消除一些错误.但我怀疑这是正确的方法.

I can, however, eliminate some error by including the missing lib by adding them one by one in system-config.ts. But I doubt this is the right approach.

const map: any = {
  'sockjs-client': 'vendor/sockjs-client/lib/entry.js',
  'json3': 'vendor/sockjs-client/node_modules/json3/lib/json3.js',
  'url-parse': 'vendor/sockjs-client/node_modules/url-parse/index.js',
  'inherits': 'vendor/sockjs-client/node_modules/inherits/inherits.js',
  'debug': 'vendor/sockjs-client/node_modules/debug/debug.js',
  ...
};

推荐答案

在新版本的 angular2 CLI https://cli.angular.io/ 添加库很简单.

In new version of angular2 CLI https://cli.angular.io/ it is simple to add library.

如果你只想添加 sockjs_client

If you want to add only sockjs_client

1) npm i --save sockjs-client

2) 在 typings.d.ts 中添加这个声明 declare module 'sockjs-client';

2) In typings.d.ts add this declaration declare module 'sockjs-client';

但我建议为 angular 2 使用 STOMP-Over-WebSocket 服务

But I would recommend to use STOMP-Over-WebSocket Service for angular 2

安装这个 npm 包

npm i --save stompjs
npm i --save sockjs-client
npm i --save ng2-stomp-service

在typings.d.ts

添加stompjs和sockjs-client模块声明

declare module 'stompjs';
declare module 'sockjs-client';

在app.module.ts

import { StompService } from 'ng2-stomp-service';

@NgModule({
  ...
  providers: [StompService]
})

在app.components.ts

import { StompService } from 'ng2-stomp-service';

private wsConf = {
  host:'test.com'
}

constructor(stomp: StompService) {

  stomp.configure(this.wsConf);

  stomp.startConnect().then(() => {
    console.log('connected');
  });


}

source https://github.com/devsullo/ng2-STOMP-Over-网络套接字

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