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前言

此前已经编写了一版后端的im，此次就用其作为服务端，可查看参考资料1

代码

使用WebStorm创建React项目

安装依赖包

PS C:\learn-demo\front\chatroom> npm installadded 183 packages, and audited 184 packages in 16s43 packages are looking for fundingrun `npm fund` for detailsfound 0 vulnerabilities

创建ChatRoom.tsx

import React, { useState, ChangeEvent } from 'react';const ChatRoom: React.FC = () => {const [message, setMessage] = useState('');const [messages, setMessages] = useState<string[]>([]);const [socket, setSocket] = useState<WebSocket | null>(null);const [userName, setUserName] = useState('');const handleSendMessage = () => {if (socket && message) {socket.send(message);setMessage('');}};const handleConnected = () => {if (userName) {setUserName(userName);createWebSocket(userName);}};const handleInputChange = (event: ChangeEvent<HTMLInputElement>) => {setMessage(event.target.value);};const handleInputName = (event: ChangeEvent<HTMLInputElement>) => {setUserName(event.target.value);};const createWebSocket = (userName: string) => {setMessages(prevMessages => [...prevMessages, `welcome 【${userName}】`])if (userName){setUserName(userName);}else {return;}//关闭已有websocket连接if (socket){socket.close()}const newSocket = new WebSocket(`ws://localhost:18080/ws?userName=${userName}`);newSocket.onopen = () => {console.log('Connected to the WebSocket server');};newSocket.onmessage = (event: MessageEvent) => {setMessages(prevMessages => [...prevMessages, event.data]);};newSocket.onclose = () => {console.log('Disconnected from the WebSocket server');};setSocket(newSocket);}return (<div><ul>{messages.map((msg, index) => (<li key={index}>{msg}</li>))}</ul><inputtype="text"value={userName}onChange={handleInputName}/><button onClick={handleConnected}>Connected</button><br/><inputtype="text"value={message}onChange={handleInputChange}/><button onClick={handleSendMessage}>Send</button></div>);
};export default ChatRoom;

修改main.tsx

import { StrictMode } from 'react'
import { createRoot } from 'react-dom/client'
import './index.css'
import ChatRoom from "./component/ChatRoom.tsx";createRoot(document.getElementById('root')!).render(<StrictMode><ChatRoom /></StrictMode>,
)

测试

• 运行项目，打开三个http://localhost:5173/的页面

分别以不同用户名（test1、test2、test3）连接websocket，步骤是第一行输入框输入用户名，然后点击Connected按钮

• test1发送全体消息

第二行输入框输入消息，点击Send按钮

test2、test3均收到消息

• test1发送消息给test2

test2收到消息

test3未收到消息

调整后端代码

上述消息分不清到底是谁发给用户的，调整下im服务的代码

SendExecutorFactory

public void onMessage(String sendUserName, String message) {IBaseSendExecutor iBaseSendExecutor = Optional.ofNullable(executorConfiguration.getBaseSendExecutorMap().get(webSocketProperties.getCommunicationType())).orElse(new DefaultSendExecutor());message = String.format("【%s】: %s", sendUserName, message);//包含@发给指定人，否则发给全部人if (StringUtils.contains(message, webSocketProperties.getReceiverSeparator())) {iBaseSendExecutor.sendToUser(sendUserName, message);} else {iBaseSendExecutor.sendToAll(sendUserName, message);}
}

重新启动服务端，发送消息

页面上重新连接，test1发送全体消息

test2、test3均收到test1的消息

参考资料

[1].im后端代码

[2].chatroom前端项目