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：
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=this.onClose(msgId)}
/>;
break;
case 'demo2':
content=this.onClose(msgId)}
/>;
break;
default:
break;
}
notification.open({
message: {title} {time},
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(
{content}
)
}
}
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(
{content}
-
-
)
}
}
NotificationSon.propTypes = {
}
express模拟消息：
到此这篇关于前端监听websocket消息并实时弹出的文章就介绍到这了,更多相关websocket消息监听内容请搜索IT俱乐部以前的文章或继续浏览下面的相关文章，希望大家以后多多支持IT俱乐部！
