Angular7使用websocket

那博瀚
2023-12-01

在angular7中,cli已经自动配置了websocket,不用再次进行安装

第一种websocket,没使用订阅,有断线重连的功能

1.创建一个WebsocketService 

  ws:WebSocket;
  url="ws://127.0.0.1:25555";

  lockReconnect:boolean;

  constructor() { }

  createObservableSocket(){
    let that=this;
    this.ws=new WebSocket(this.url);

    this.ws.onopen=()=>{
      console.log("连接打开");
      this.sendMessages("hello");
    };

    this.ws.onmessage=(event)=> {
    };

    this.ws.onerror=(event)=>{
      that.reConnect();
    };

    this.ws.onclose=(event)=>{
      console.log("连接断开");
      that.reConnect();
    };
  }

  reConnect(){
    let that=this;
    console.log("断线重连");

    if (this.lockReconnect) return;
    this.lockReconnect = true;
    setTimeout(()=>{
      this.lockReconnect = false;
    },1000);
  }

  sendMessages(messages:any){
    if (this.ws){
      if (this.ws.readyState === 1){
        this.ws.send(messages);
      }else {
        console.log(this.ws.readyState);
      }
    }else {
      alert("连接不成功,等待重连!");
      setTimeout(()=>{
        this.ws.send(messages);
      },1000);
    }
  }

第二种websocket,使用订阅,目前没有断线重连的功能

1.创建一个WebsocketService 

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

@Injectable({
  providedIn: 'root',
})
export class WebsocketService {

  constructor() { }

  ws:WebSocket;

  //创建可观测的流,包括服务器返回来的消息
  createObservableSocket(url:string):Observable<any>{
    this.ws=new WebSocket(url);
    return new Observable(
      observable=>{
        //成功返回数据
        this.ws.onmessage=(event)=>{observable.next(event.data);};
        //返回数据失败,抛出异常
        this.ws.onerror=(event)=>{observable.error(event);};
        //关闭连接
        this.ws.onclose=(event)=>{observable.complete();};
      },
    );
  }

  sendMessage(message:any){
    let that=this;
    if (this.ws){
      if (this.ws.readyState === 1){
        this.ws.send(JSON.stringify(message));
      } else {
        console.log(this.ws.readyState);
      }
    } else {
      // socket可能还没连接成功,那么延迟一秒再发送消息
      console.log("连接不成功,等待重连");
      setTimeout(()=>{
        that.ws.send(JSON.stringify(message));
      },1000);
    }

  }

}


 

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