前端监听mq?前端监听websocket消息并实时弹出(实例代码)

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本文默认您已掌握react生态开发的相关技术，并熟练应用umiJS的原则上，请继续！

项目需求：

1、服务侧推送给消息给前端，前端需要展示在右下角
2、根据不同的消息类型，提供不同的操作按钮‘同意’、‘拒绝’等

代码设计：

1、使用websocket方式建立通道
2、前端基于umi+antd+reconnecting-websocket.js开发
3、使用express+express-ws+mockjs建立websocket服务通道，模拟服务端推送消息

运行效果：

图片[1]-前端监听mq?前端监听websocket消息并实时弹出(实例代码)-森戈教程网

图片[2]-前端监听mq?前端监听websocket消息并实时弹出(实例代码)-森戈教程网

图片[3]-前端监听mq?前端监听websocket消息并实时弹出(实例代码)-森戈教程网

使用方法：

1、项目中已引入reconnecting-websocket.min.js，详见其官方文档

2、登录成功后，接着调用websocket初始化：


yield put({
    type: 'websocket/init',
    payload: {
        authToken
    }
});

核心代码：

1、/service/websocket.js


/**
 * 基于reconnecting-websocket库已引入
 * 封装service文件
 */
class Websocket{
 
  /**
   * websocket逻辑
   * 2021-10-28
   */
 
  constructor(){
    this.websocket=null;
    this.url='ws://127.0.0.1:30001/websocket-im';
    this.options={
      connectionTimeout: 5000,
      maxRetries: 10,
    };
  }
 
  init=()=>{
    this.websocket = new ReconnectingWebSocket(this.url,[], this.options);
  }
 
  close=()=>{
    this.websocket && this.websocket.close();
  }
 
  onMessage=(callback)=>{
    this.websocket && this.websocket.addEventListener('message', (e) => {
      callback&&callback(e)
    });
  }
 
}
 
const websocket = new Websocket();
 
// 初始化连接
export function openWs() {
  return websocket.init();
}
 
// 关闭连接
export function closeWs() {
  return websocket.close();
}
 
// 监听websocket消息
export function onMessage() {
  let deferred;
  websocket.onMessage(function(e){
    if(deferred) {
        deferred.resolve(e)
        deferred = null 
    }
  });
  return {
    message() {
      if(!deferred) {
          deferred = {}
          deferred.promise = new Promise(resolve => deferred.resolve = resolve)
      }
      return deferred.promise;
    }
  }
}

2、/model/websocket.js

 
/**
 * 封装model文件
 * moment、immutable、antd、nanoid组件请自行学习
 */
import {openWs,onMessage,closeWs} from 'services/websocket'
import moment from 'moment'
import { Map, fromJS } from 'immutable'
import { notification } from 'antd'
import nanoid from 'nanoid';
 
const initState = Map({
 
  message:Map(), //收到的消息
  
});
export default {
  namespace: 'websocket',
 
  state: initState,
  subscriptions: {
    setup({ dispatch, history }) {
      dispatch({
        type: 'listener'
      });
      return history.listen(({ pathname, query }) => {
        
      });
    },
  },
  effects: {
 
    * listener({ payload }, { take, put, call }) {
      while (true) {
        const { type, payload } = yield take(['logout']);
        
        // 监听退出系统，则关闭websocket
        if (type === 'logout') {
          // 关闭websocket
          yield call(closeWs);
          notification.destroy();
          yield put({
            type: 'clearAllMessage', 
            payload:{
            }
          });
        }
      }
    },
 
    // 启动websocket
    * init ({
      payload,
    }, { put, call, select }) {
      yield call(openWs);
      const listener = yield call(onMessage);
      yield put({type: 'receiveMsg', payload:{listener}});
    }, 
 
    // 接受消息
    * receiveMsg ({
        payload: {listener}
    }, { call, select, put}) {
        while(true){
          const event = yield call(listener.message);
 
          yield put({
            type: 'progressMsg', 
            payload:{
              msg:JSON.parse(event.data)
            }
          });
          
            
        }
    },
 
    // 统筹消息
    * progressMsg ({
        payload: {msg}
    }, { call, select, put}) {
 
      console.log(msg)
      
      yield put({
        type: 'addOneMessage', 
        payload:{
          msg
        }
      });
        
    },
 
  },
  
  reducers: {
    
    addOneMessage(state, { payload:{msg} }) {
   
      const msgId = nanoid()+'-'+moment().format('x');
      return state.setIn(['message',msgId], fromJS({...msg,msgId}))
 
    },
 
    removeOneMessage(state, { payload:{msgId} }) {
   
      return state.deleteIn(['message',msgId])
 
    },
 
    clearAllMessage(state, { payload:{} }) {
   
      return state.setIn(['message'],Map())
 
    },
    
 
  },
  
}

3、Notification组件封装，结构及代码

（1）package.json

{
  "name": "Notification",
  "version": "0.0.0",
  "private": true,
  "main": "./index.js"
}

（2） index.less

.Notification{
    .btns{
        padding: 0;
        margin: 15px 0 0 0;
        list-style: none;
        width: 100%;
        display: flex;
        justify-content: flex-end;
        li{
            margin-left: 10px;
        }
    }
}

（3）index.js

/**
 * 右下角弹窗组件封装
 */
import React from 'react'
import { injectIntl } from 'react-intl';
import moment from 'moment'
import { connect } from 'dva'
import { notification } from 'antd';
import Demo1 from './Demo1'
import Demo2 from './Demo2'
 
@injectIntl
@connect(({
  websocket, 
}) => ({ 
  websocket
}))
export default class Notification extends React.Component {
 
  componentWillReceiveProps(nextProps) {
    const {websocket,dispatch,intl, intl: { formatMessage }} = nextProps;
    let message=websocket.get('message');
 
    message.forEach((note)=>{
 
      let object=note.getIn(['object']);
      let msgId=note.getIn(['msgId']);
      let title=note.getIn(['title']);
      let content=note.getIn(['content']);
      let format = 'YYYY-MM-DD HH:mm:ss';
      let time=note.getIn(['ts'])?moment(note.getIn(['ts']), 'x').format(format):moment().format(format);
 
      switch (object) {
        case 'demo1':
          content=<Demo1dispatch={dispatch}intl={intl}note={note}onClose={()=>this.onClose(msgId)}
					/>;
					break;
        case 'demo2':
          content=<Demo2
            dispatch={dispatch}
            intl={intl}
            note={note}
            onClose={()=>this.onClose(msgId)}
          />;
          break;
        default:
					break;
			}
 
      notification.open({
        message: <span>{title} <small>{time}</small></span>,
        duration:30,
        key: msgId,
        description:content,
        placement: 'bottomRight',
        onClick: () => {
          
        },
        onClose: () => {
          this.onClose(msgId);
        }
      });
    })
 
  }
 
  // 关闭消息
  onClose=(msgId)=>{
    const {dispatch} = this.props;
    dispatch({
      type:'websocket/removeOneMessage',
      payload:{
        msgId
      }
    })
    return notification.close(msgId);
  }
  
  render(){
    return(
        null
    )
  }
  
}
 
 
Notification.propTypes = {
  
}

（4）Demo1.js

import React from 'react'
import styles from './index.less'
 
export default class NotificationSon extends React.Component {
  
  render(){
    const {note,intl:{formatMessage}} = this.props;
    let content=note.getIn(['content']);
 
    return(
        <div className={styles.Notification}>
          <div>{content}</div>
        </div>
    )
  }
  
}
 
NotificationSon.propTypes = {
  
}

（5）Demo2.js

import React from 'react'
import styles from './index.less'
import { config } from 'utils'
import { Button } from 'antd';
 
const { defaultStyleSize } = config;
 
export default class NotificationSon extends React.Component {
 
  dealApproval=(type,data)=>{
    const {dispatch,onClose} = this.props;
    if(type=='refuse'){
      console.log('拒绝')
      onClose();
    }else if(type=='agree'){
      console.log('同意')
      onClose();
    }
    
  }
  
  render(){
    const {note,intl:{formatMessage}} = this.props;
    let content=note.getIn(['content']);
 
    return(
        <div className={styles.Notification}>
          <div>{content}</div>
          <ul className={styles.btns}>
            <li>
              <Button style={{ marginLeft: '12px' }} type={'primary'} size={defaultStyleSize}  onClick={() => {this.dealApproval('agree',note.get('data'))}}>{formatMessage({id: 'Global.agree'})}</Button>
            </li>
            <li>
              <Button style={{ marginLeft: '12px' }} type={'danger'} size={defaultStyleSize}  onClick={() => {this.dealApproval('refuse',note.get('data'))}}>{formatMessage({id: 'Global.refuse'})}</Button>
            </li>
          </ul>
        </div>
    )
  }
  
}
 
NotificationSon.propTypes = {
  
}

express模拟消息：

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