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在angular2 webapp项目中使用sockjs client/SockJSs创建Websocket

sockjs vert.x websocket typescript angular

1

Shasha · 技术社区 · 9 年前

我使用Angular2 webapp项目作为前端,使用Vertex3作为后端。

使用Sockjs客户端,我正在创建websocket(在客户端)来创建前端和后端之间的通信通道。

我已经使用npm安装了sockjs客户端:

npm安装sockjs客户端

当我在LoginService中导入sockjs客户端时。ts文件:

从“SockJS客户端”导入*作为SockJS;

export class LoginService { 
URL: string = 'http://localhost:8082/eventbus';
sock: SockJS;
handlers = {};

private _opened: boolean = false;

public open(): void {
    if (!this._opened) {
        this.sock = new SockJS(this.URL);
    this.sock.onopen = (e) => {
            this.callHandlers('open', e);
        }
        this.sock.onmessage = (e) => {
            this.messageReceived(e);
        }
        this.sock.onclose = (e) => {
            this.callHandlers('close', e);
        }
        this._opened = true;
    }

    public isOpen(): boolean {
    return this._opened;
}

public close(): void {
    if (this._opened) {
        this.sock.close();
        delete this.sock;
        this._opened = false;
    }
}

private messageReceived (e) {
    var msg = JSON.parse(e.data);
    this.callHandlers('message', msg.type, msg.originator, msg.data);
}

private callHandlers (type: string, ...params: any[]) {
    if (this.handlers[type]) {
        this.handlers[type].forEach(function(cb) {
            cb.apply(cb, params);
        });
    }
}  
public send (type: string, data: any) {
    if (this._opened) {
        var msg = JSON.stringify({
            type: type,
            data: data
        });

        this.sock.send(msg);
    }
}


}

使用运行angular2 webapp项目时没有错误

npm运行服务器

但在客户端不创建websocket连接。因为我已经使用vertex创建了服务器 vertex.createHttpServer (托管于: http://localhost:8082 ).

所以我有两个问题:

1.无法在angular2 webapp中导入sockjs客户端,因此无法创建websocket连接。

我还缺什么吗?

提前感谢!!!

1 回复 | 直到 9 年前

1

Shasha 9 年前

找到了一种在angular2中集成sockjs的方法,无需使用 typings .

使用以下步骤:

进口 sockjs-event.js 和 sockjs-client.js 在里面 index.html

     <!doctype html>
     <html>
      <head>
      <meta charset="utf-8">
        <title>MyApp</title>
        <script src="/sockjs-client.js"></script>
        <script src="/sockjs-event.js"> </script> 

         ......
         </head>
         <body>
          <my-app>Loading...</my-app>
        </body>
     </html>

创建导出服务 myapp.service.ts

    declare var EventBus: any;
    @Injectable()
     export class ConsoleService {
      URL: string = 'http://localhost:8082/eventbus';
      handlers = {};
      eventBus: any;
      private _opened: boolean = false;

       public open(): void {

       if (!this._opened) {
        this.eventBus = new EventBus(this.URL);
        this.eventBus.onopen = (e) => {
               this._opened = true;
                console.log("open connection");
                this.callHandlers('open', e);
                this.eventBus.publish("http://localhost:8082", "USER LOGIN                 INFO");

                this.eventBus.registerHandler("http://localhost:8081/pushNotification", function (error, message) {
                   console.log(message.body);


                //$("<div title='Basic dialog'>Test   message</div>").dialog();

          });
        }
        this.eventBus.onclose = (e) => {
            this.callHandlers('close', e);
          }
        }
    }

     public isOpen(): boolean {
      return this._opened;
     }

    public close(): void {
      if (this._opened) {
        this.eventBus.close();
        delete this.eventBus;
        this._opened = false;
     }

     }

      .......



    public send (type: string, data: any) {
        if (this._opened) {
            var msg = JSON.stringify({
              type: type,
             data: data
          });

          this.eventBus.publish("http://localhost:8082",msg);
        }
      }
    };

     export default ConsoleService;

转到起始模块,在我的情况下,它是 app.module.ts 并加载您的服务

      import { AppComponent } from './app.component';
      ....
      import { ConsoleService } from 'services/myapp.service';

        @NgModule({
          imports: [
            ....
          ],
        providers:    [ ConsoleService ],

      declarations: [
          AppComponent,
        ...
       ],
         bootstrap: [AppComponent]
     })

4.从启动组件调用OpenWebSocket app.component.ts

      import { Component } from '@angular/core';
      import 'style/app.scss';
      import { ConsoleService } from 'services/globalConsole.service';
      @Component({
       selector: 'my-app', // <my-app></my-app>
       templateUrl: './app.component.html',
       styleUrls: ['./app.component.scss']

      })

    export class AppComponent {

      constructor (private consoleService: ConsoleService) {
        consoleService.onOpen((e) => {
                 consoleService.send('message', "xyz");
             });

          consoleService.open();
       }

  }

最后,您可以使用 EventBus 到 publish 和 registerHandler 无论如何 .ts 使用导入的文件 ConsoleService .

我希望这会有所帮助:)