Ionic WebSocket 使用

Ionic WebSocket 使用

編寫寫一個工具類

import { Injectable } from '@angular/core';
import { Observable } from "rxjs/Observable";
import {observable} from "rxjs/symbol/observable";
 
@Injectable()
export class WebSocketService {
 
  ws:WebSocket
 
  constructor(){
 
  }
  createObservableSocket(url:string ):Observable<any>{
    this.ws = new WebSocket(url);
    return new Observable<any>(
      observable =>{
        this.ws.onmessage = (event)=> observable.next(event.data);
        this.ws.onerror = (event)=>observable.error(event);
        this.ws.onclose = (event)=>observable.complete();
      }
    )
  }
  sendMessage(message:string){
    this.ws.send(message);
  }
}

當然 rxjs 需要自己安裝一下

npm install rxjs

如果是高版本的話可能會說找不到，需要改一下導入的包：

import { Observable} from 'rxjs';
import {observable} from 'rxjs';

改完之後就沒問題了應該。

組件中引用

import {WebSocketService} from "../service/websocket.service";

Component裏配置

@Component({
  selector: 'app-home',
  templateUrl: 'home.page.html',
  styleUrls: ['home.page.scss'],
  providers: [WebSocketService]
})

構造函數裏聲明

constructor(  private wsService:WebSocketService) {}

使用

連接接受消息

init(){
  this.wsService.createObservableSocket('ws://121.40.165.18:8800').subscribe(rep =>{
       console.log(rep)
  },error=>{
       console.log("出錯")
  });
  console.log('已連接 ws://121.40.165.18:8800')
}

發送消息

sendMessage(){
    this.wsService.sendMessage("123")
}