怎么用SpringBoot+Netty实现简单聊天室

本篇内容主要讲解"怎么用SpringBoot+Netty实现简单聊天室"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"怎么用SpringBoot+Netty实现简单聊天室"吧!

一、实现

1.User类

import java.util.Objects;public class User {    public String id;    public String nickname;    public User(String id, String nickname) {        super();        this.id = id;        this.nickname = nickname;    }    public String getId() {        return id;    }    public void setId(String id) {        this.id = id;    }    public String getNickname() {        return nickname;    }    public void setNickname(String nickname) {        this.nickname = nickname;    }    @Override    public boolean equals(Object o) {        if (this == o)            return true;        if (o == null || getClass() != o.getClass())            return false;        User user = (User) o;        return id.equals(user.getId());    }    @Override    public int hashCode() {        return Objects.hash(id);    }    public String getUid() {        return id;    }}

2.SocketSession类

import io.netty.channel.Channel;import io.netty.channel.ChannelHandlerContext;import io.netty.util.AttributeKey;import java.util.HashMap;import java.util.Map;import java.util.UUID;public class SocketSession {    public static final AttributeKey SESSION_KEY = AttributeKey.valueOf("SESSION_KEY");    /**     * 用户实现服务端会话管理的核心     */// 通道    private Channel channel;    // 用户    private User user;    // session唯一标示    private final String sessionId;    private String group;    /**     * session中存储的session 变量属性值     */    private Map map = new HashMap();    public SocketSession(Channel channel) {//注意传入参数channel。不同客户端会有不同channel        this.channel = channel;        this.sessionId = buildNewSessionId();        channel.attr(SocketSession.SESSION_KEY).set(this);    }    // 反向导航    public static SocketSession getSession(ChannelHandlerContext ctx) {//注意ctx，不同的客户端会有不同ctx        Channel channel = ctx.channel();        return channel.attr(SocketSession.SESSION_KEY).get();    }    // 反向导航    public static SocketSession getSession(Channel channel) {        return channel.attr(SocketSession.SESSION_KEY).get();    }    public String getId() {        return sessionId;    }    private static String buildNewSessionId() {        String uuid = UUID.randomUUID().toString();        return uuid.replaceAll("-", "");    }    public synchronized void set(String key, Object value) {        map.put(key, value);    }    public synchronized  T get(String key) {        return (T) map.get(key);    }    public boolean isValid() {        return getUser() != null ? true : false;    }    public User getUser() {        return user;    }    public void setUser(User user) {        this.user = user;    }    public String getGroup() {        return group;    }    public void setGroup(String group) {        this.group = group;    }    public Channel getChannel() {        return channel;    }}

3.SessionGroup

import com.google.gson.Gson;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelFutureListener;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.group.ChannelGroup;import io.netty.channel.group.ChannelGroupFuture;import io.netty.channel.group.DefaultChannelGroup;import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;import io.netty.util.concurrent.ImmediateEventExecutor;import org.springframework.util.StringUtils;import java.util.Iterator;import java.util.Map;import java.util.concurrent.ConcurrentHashMap;public final class SessionGroup {    private static SessionGroup singleInstance = new SessionGroup();    // 组的映射    private ConcurrentHashMap groupMap = new ConcurrentHashMap<>();    public static SessionGroup inst() {        return singleInstance;    }    public void shutdownGracefully() {        Iterator groupIterator = groupMap.values().iterator();        while (groupIterator.hasNext()) {            ChannelGroup group = groupIterator.next();            group.close();        }    }    public void sendToOthers(Map result, SocketSession s) {        // 获取组        ChannelGroup group = groupMap.get(s.getGroup());        if (null == group) {            return;        }        Gson gson=new Gson();        String json = gson.toJson(result);        // 自己发送的消息不返回给自己//      Channel channel = s.getChannel();        // 从组中移除通道//      group.remove(channel);        ChannelGroupFuture future = group.writeAndFlush(new TextWebSocketFrame(json));        future.addListener(f -> {            System.out.println("完成发送："+json);//          group.add(channel);//发送消息完毕重新添加。        });    }    public void addSession(SocketSession session) {        String groupName = session.getGroup();        if (StringUtils.isEmpty(groupName)) {            // 组为空，直接返回            return;        }        ChannelGroup group = groupMap.get(groupName);        if (null == group) {            group = new DefaultChannelGroup(ImmediateEventExecutor.INSTANCE);            groupMap.put(groupName, group);        }        group.add(session.getChannel());    }    /**     * 关闭连接， 关闭前发送一条通知消息     */    public void closeSession(SocketSession session, String echo) {        ChannelFuture sendFuture = session.getChannel().writeAndFlush(new TextWebSocketFrame(echo));        sendFuture.addListener(new ChannelFutureListener() {            public void operationComplete(ChannelFuture future) {                System.out.println("关闭连接："+echo);                future.channel().close();            }        });    }    /**     * 关闭连接     */    public void closeSession(SocketSession session) {        ChannelFuture sendFuture = session.getChannel().close();        sendFuture.addListener(new ChannelFutureListener() {            public void operationComplete(ChannelFuture future) {                System.out.println("发送所有完成："+session.getUser().getNickname());            }        });    }    /**     * 发送消息     * @param ctx 上下文     * @param msg 待发送的消息     */    public void sendMsg(ChannelHandlerContext ctx, String msg) {        ChannelFuture sendFuture = ctx.writeAndFlush(new TextWebSocketFrame(msg));        sendFuture.addListener(f -> {//发送监听            System.out.println("对所有发送完成："+msg);        });    }}

4.WebSocketTextHandler类

import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.SimpleChannelInboundHandler;import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;import io.netty.handler.timeout.IdleState;import io.netty.handler.timeout.IdleStateEvent;import java.util.HashMap;import java.util.Map;public class WebSocketTextHandler extends SimpleChannelInboundHandler {    @Override    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {        SocketSession session = SocketSession.getSession(ctx);        TypeToken> typeToken = new TypeToken>() {        };        Gson gson=new Gson();        java.util.Map map = gson.fromJson(msg.text(), typeToken.getType());        User user = null;        switch (map.get("type")) {            case "msg":                Map result = new HashMap<>();                user = session.getUser();                result.put("type", "msg");                result.put("msg", map.get("msg"));                result.put("sendUser", user.getNickname());                SessionGroup.inst().sendToOthers(result, session);                break;            case "init":                String room = map.get("room");                session.setGroup(room);                String nick = map.get("nick");                user = new User(session.getId(), nick);                session.setUser(user);                SessionGroup.inst().addSession(session);                break;        }    }    @Override    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {        // 是否握手成功，升级为 Websocket 协议        if (evt == WebSocketServerProtocolHandler.ServerHandshakeStateEvent.HANDSHAKE_COMPLETE) {            // 握手成功，移除 HttpRequestHandler，因此将不会接收到任何消息            // 并把握手成功的 Channel 加入到 ChannelGroup 中            new SocketSession(ctx.channel());        } else if (evt instanceof IdleStateEvent) {            IdleStateEvent stateEvent = (IdleStateEvent) evt;            if (stateEvent.state() == IdleState.READER_IDLE) {                System.out.println("bb22");            }        } else {            super.userEventTriggered(ctx, evt);        }    }}

5.WebSocketServer类

import io.netty.bootstrap.ServerBootstrap;import io.netty.channel.Channel;import io.netty.channel.ChannelInitializer;import io.netty.channel.ChannelPipeline;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.SocketChannel;import io.netty.channel.socket.nio.NioServerSocketChannel;import io.netty.handler.codec.http.HttpObjectAggregator;import io.netty.handler.codec.http.HttpServerCodec;import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketServerCompressionHandler;import io.netty.handler.stream.ChunkedWriteHandler;import io.netty.handler.timeout.IdleStateHandler;import java.util.concurrent.TimeUnit;public class WebSocketServer {    private static WebSocketServer wbss;    private static final int READ_IDLE_TIME_OUT = 60; // 读超时    private static final int WRITE_IDLE_TIME_OUT = 0;// 写超时    private static final int ALL_IDLE_TIME_OUT = 0; // 所有超时    public static WebSocketServer inst() {        return wbss = new WebSocketServer();    }    public void run(int port) {        EventLoopGroup bossGroup = new NioEventLoopGroup();        EventLoopGroup workerGroup = new NioEventLoopGroup();        ServerBootstrap b = new ServerBootstrap();        b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)                .childHandler(new ChannelInitializer () {                    @Override                    protected void initChannel(SocketChannel ch) throws Exception {                        ChannelPipeline pipeline = ch.pipeline();                        // Netty自己的http解码器和编码器，报文级别 HTTP请求的解码和编码                        pipeline.addLast(new HttpServerCodec());                        // ChunkedWriteHandler 是用于大数据的分区传输                        // 主要用于处理大数据流，比如一个1G大小的文件如果你直接传输肯定会撑暴jvm内存的;                        // 增加之后就不用考虑这个问题了                        pipeline.addLast(new ChunkedWriteHandler());                        // HttpObjectAggregator 是完全的解析Http消息体请求用的                        // 把多个消息转换为一个单一的完全FullHttpRequest或是FullHttpResponse，                        // 原因是HTTP解码器会在每个HTTP消息中生成多个消息对象HttpRequest/HttpResponse,HttpContent,LastHttpContent                        pipeline.addLast(new HttpObjectAggregator(64 * 1024));                        // WebSocket数据压缩                        pipeline.addLast(new WebSocketServerCompressionHandler());                        // WebSocketServerProtocolHandler是配置websocket的监听地址/协议包长度限制                        pipeline.addLast(new WebSocketServerProtocolHandler("/ws", null, true, 10 * 1024));                        // 当连接在60秒内没有接收到消息时，就会触发一个 IdleStateEvent 事件，                        // 此事件被 HeartbeatHandler 的 userEventTriggered 方法处理到                        pipeline.addLast(                                new IdleStateHandler(READ_IDLE_TIME_OUT, WRITE_IDLE_TIME_OUT, ALL_IDLE_TIME_OUT, TimeUnit.SECONDS));                        // WebSocketServerHandler、TextWebSocketFrameHandler 是自定义逻辑处理器，                        pipeline.addLast(new WebSocketTextHandler());                    }                });        Channel ch = b.bind(port).syncUninterruptibly().channel();        ch.closeFuture().syncUninterruptibly();        // 返回与当前Java应用程序关联的运行时对象        Runtime.getRuntime().addShutdownHook(new Thread() {            @Override            public void run() {                SessionGroup.inst().shutdownGracefully();                bossGroup.shutdownGracefully();                workerGroup.shutdownGracefully();            }        });    }}

6.index.html

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    发送

二、效果

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