参考链接

zzhua/netty-chat-web - 包括前后端

vue.js实现带表情评论功能前后端实现（仿B站评论）
vue.js实现带表情评论仿bilibili（滚动加载效果）

vue.js支持表情输入
vue.js表情文本输入框组件

个人说说vue组件

JS操作文本域获取光标/指定位置插入

分布式ID生成之雪花算法（SnowFlake）

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netty-demo-crazy - 疯狂架构师netty

IM即时通讯系统[SpringBoot+Netty]——梳理（总）， 代码 im-system 在gitee

构建IM即使通讯Web页面 - B站视频，仅前端代码，代码 chat-demo 在gitee

• 禹神：一小时快速上手Electron，前端Electron开发教程，笔记。一篇文章入门Electron
• Electron集成Vite + Vue 开发IM即使通讯
• easychat - gitee代码

基于vue3实现一个简单的输入框效果
vue3通过组合键实现换行操作的示例详解

easychat - B站视频，前后端，代码在gitee

subtlechat-mini - 前后端，有mini版和完整版

lyf-im - 前后端项目

box-im - 盒子im，很棒

MallChat - 前后端项目，代码很棒

木杉/ 视频通话 netty webrtc websocket springboot uniapp

木杉/ /mushan-im

ProgHub/chat_room

yymao/chatroom - 仅前端，im界面好看

H260788/PureChat - im界面好看，前端难度大

netty-chatroom - netty实现，仅后端代码

liurq_netty_barrage - netty实现的1个简单的弹幕效果

yorick_socket一套基于Netty的轻量级Socket和WebSocket框架，可用于搭建聊天服务器和游戏同步服务器

【聊天系统】从零开始自己做一个"wechat" - uniapp 和 springboot

linyu-mini-web&linyu-mini-server gitee 前后端代码

aq-chat web端，AQChatServer，aqchat-mobile，AQChat文档中心,

考拉开源/im-uniapp，im-platform 后台代码

ws-chat - 前后端代码

yan代码，B站视频)

im-whale-shark代码，B站视频

使用

前端使用：vue.js + vuex + iconfont + element-ui
后端使用：springboot + mybatisplus + redis + netty + websocket + spring security

可能有不少问题，反正先按照自己思路一点一点写，再参考下别人是怎么搞的再优化

前端界面

先写下大概的前端界面，界面出来了，才有继续写下去的动力

简单效果

消息窗口平滑滚动至底部

<div class="panel-main-body" ref="panelMainBodyContainerRef"><!-- 对应会话 的消息列表 --><div class="msg-item-list" ref="msgItemListContainerRef"><div :class="['msg-item', familyChatMsg.senderId != currUserId ? 'other' : 'owner']"v-for="(familyChatMsg, idx) in familyChatMsgList" :key="idx"><div class="avatar-wrapper "><img :src="familyChatMsg.avatar" class="avatar fit-img" alt=""></div><div class="msg"><div class="msg-header">{{ familyChatMsg.nickName }}</div><div class="msg-content" v-html="familyChatMsg.content"></div></div></div></div></div><script>
export default {methods: {/* 滚动至底部，不过调用此方法的时机应当在familyChatMsgList更新之后, 因此需要监听它 */scrollToEnd() {const panelMainBodyContainerRef = this.$refs['panelMainBodyContainerRef']const msgItemListContainerRef = this.$refs['msgItemListContainerRef']// console.log(msgItemListContainerRef.scrollTop);// console.log(panelMainBodyContainerRef.scrollHeight);msgItemListContainerRef.scrollTop = msgItemListContainerRef.scrollHeightconsole.log('滚动至底部~');},}}
</script><style>
.msg-item-list {/* 平滑滚动 */scroll-behavior: smooth;
}
</style>

vue使用watch监听vuex中的变量变化

computed: {...mapGetters('familyChatStore', ['familyChatMsgList']),
},watch: {// 监听store中的数据 - 是通过监听getters完成的familyChatMsgList:{handler(newVal, oldVal) {// console.log('---------------------');// console.log(newVal.length, oldVal.length);this.$nextTick(()=>{this.scrollToEnd()})}}},

websocket握手认证

客户端在登录完成后，可以请求后端的接口获取1个chatKey（这个chatKey只有在用户登录后，携带token访问时才能得到），得到此chatKey后，连接websocket客户端时，把这个chatKey作为请求参数拼接到ws://xxxx.xx.xx:9091/ws?chatKey=xxx，这样在握手的时候，就可以拿到这个请求参数。但是，我不想在握手完成事件时再去拿这个chatKey（虽然这样做，也没什么问题，但感觉逻辑不是很好，都已经握手完成了，再来断掉ws连接有点不好），因此，设置1个ChatKeyCheckHandler，它继承自SimpleInboundHandlerAdapter，处理的泛型是FullHttpRequest，并且把这个处理器放在WebSocketServerProtocolHandler的前面，这样，在处理握手请求时，就可以拿到请求参数了，而握手完成之后，由于后面的消息是websocket协议帧数据，它不会FullHttpRequest类型的，因此不会经过这个处理器，这样感觉比较好~

ChatKeyCheckHandler

@Slf4j
@ChannelHandler.Sharable
@Component
public class ChatKeyCheckHandler extends SimpleChannelInboundHandler<FullHttpRequest> {public ChatKeyCheckHandler() {super(false);}@Overrideprotected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest msg) throws Exception {log.info("http请求-chatKeyCheckHandler处理");FullHttpRequest request = ((FullHttpRequest) msg);String uri = request.uri();log.info("请求uri: {}");log.info("请求header: {}", Arrays.toString(request.headers().names().toArray()));List<String> chatKeys = UriComponentsBuilder.fromUriString(uri).build().getQueryParams().get(Constants.CHAT_KEY);if (CollectionUtils.isEmpty(chatKeys)) {log.error("欲建立websocket连接,但未携带chatKey,直接略过");// 还得写个响应回去，并且关闭HTTP连接HttpRequest req = msg;FullHttpResponse response = new DefaultFullHttpResponse(req.protocolVersion(), OK,Unpooled.wrappedBuffer("NOT ALLOWD WITHOUT CHAT_KEY".getBytes()));response.headers().set(CONTENT_TYPE, TEXT_PLAIN).setInt(CONTENT_LENGTH, response.content().readableBytes());// Tell the client we're going to close the connection.response.headers().set(CONNECTION, CLOSE);ChannelFuture f = ctx.writeAndFlush(response);f.addListener(ChannelFutureListener.CLOSE);return;}String chatKey = chatKeys.iterator().next();ctx.channel().attr(WsContext.CHAT_KEY_ATTR).set(chatKey);log.info("建立websocket连接的握手请求, 携带了chatKey: {}", chatKey);// 在此处校验chatKey是否合理, 如果不合理, 则不允许建立websocket链接（不会进行后面的握手处理）ctx.fireChannelRead(request);}
}

NettyChatServer

@Slf4j
@Component
public class NettyChatServer implements SmartLifecycle {@Autowiredprivate NettyProperties nettyProps;@Autowiredprivate NettyChatInitializer nettyChatInitializer;private volatile boolean running = false;private ServerChannel serverChannel;private EventLoopGroup bossGroup;private EventLoopGroup workerGroup;public void start() {log.info("starting netty server~");bossGroup = new NioEventLoopGroup(1);workerGroup = new NioEventLoopGroup(2);ServerBootstrap serverBootstrap = new ServerBootstrap();serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(nettyChatInitializer);// 这里会异步调用ChannelFuture channelFuture = serverBootstrap.bind(nettyProps.getPort());channelFuture.addListener(future -> log.info("netty started, listening: {}", nettyProps.getPort()));// 保存对ServerSocketChannel的引用serverChannel = (NioServerSocketChannel) channelFuture.channel();channelFuture.channel().closeFuture().addListener(future -> log.info("netty stopped!"));running = true;}@Overridepublic void stop() {log.info("stop netty server");try {serverChannel.close();} catch (Exception e) {log.error("关闭ServerSocketChannel失败");}if (bossGroup != null) {bossGroup.shutdownGracefully();}if (workerGroup != null) {workerGroup.shutdownGracefully();}running = false;}@Overridepublic boolean isRunning() {return this.running;}}

NettyChatInitializer

@Component
public class NettyChatInitializer extends ChannelInitializer<SocketChannel> {@Autowiredprivate NettyProperties nettyProperties;@Autowiredprivate DispatcherMsgHandler dispatcherMsgHandler;@Autowiredprivate HandShakeHandler handShakeHandler;@Autowiredprivate ChatKeyCheckHandler chatKeyCheckHandler;@Overrideprotected void initChannel(SocketChannel ch) throws Exception {DefaultEventLoopGroup eventExecutors = new DefaultEventLoopGroup(2);ChannelPipeline pipeline = ch.pipeline();pipeline.addLast(new IdleStateHandler(10, 0, 0, TimeUnit.SECONDS));pipeline.addLast("http-decoder", new HttpRequestDecoder());pipeline.addLast("http-encoder", new HttpResponseEncoder());pipeline.addLast("aggregator", new HttpObjectAggregator(64 * 1024));pipeline.addLast(new ChunkedWriteHandler());WebSocketServerProtocolConfig wsServerConfig = WebSocketServerProtocolConfig.newBuilder().websocketPath(nettyProperties.getWsPath()).checkStartsWith(true).maxFramePayloadLength(Integer.MAX_VALUE).build();pipeline.addLast("chatKeyHandler", chatKeyCheckHandler);pipeline.addLast("websocketHandler", new WebSocketServerProtocolHandler(wsServerConfig));pipeline.addLast("handShakeHandler", handShakeHandler);pipeline.addLast("heartBeanCheckHandler", new HeatBeatCheckHandler());pipeline.addLast(eventExecutors, "dispatcherMsgHandler", dispatcherMsgHandler);}}