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!
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;
}
}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<SocketSession> 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<String, Object> map = new HashMap<String, Object>();
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> 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;
}
}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<String, ChannelGroup> groupMap = new ConcurrentHashMap<>();
public static SessionGroup inst() {
return singleInstance;
}
public void shutdownGracefully() {
Iterator<ChannelGroup> groupIterator = groupMap.values().iterator();
while (groupIterator.hasNext()) {
ChannelGroup group = groupIterator.next();
group.close();
}
}
public void sendToOthers(Map<String, String> 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);
});
}
}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<TextWebSocketFrame> {
@Override
protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
SocketSession session = SocketSession.getSession(ctx);
TypeToken<HashMap<String, String>> typeToken = new TypeToken<HashMap<String, String>>() {
};
Gson gson=new Gson();
java.util.Map<String,String> map = gson.fromJson(msg.text(), typeToken.getType());
User user = null;
switch (map.get("type")) {
case "msg":
Map<String, String> 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);
}
}
}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 <SocketChannel>() {
@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();
}
});
}
}<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>群聊天室</title>
<style type="text/css">
body {
margin-right:50px;
margin-left:50px;
}
.ddois {
position: fixed;
left: 120px;
bottom: 30px;
}
</style>
</head>
<body>
群名：<input type="text" id="room" name="group" placeholder="请输入群">
<br /><br />
昵称：<input type="text" id="nick" name="name" placeholder="请输入昵称">
<br /><br />
<button type="button" onclick="enter()">进入聊天群</button>
<br /><br />
<div id="message"></div>
<br /><br />
<div class="ddois">
<textarea name="send" id="text" rows="10" cols="30" placeholder="输入发送消息"></textarea>
<br /><br />
<button type="button" onclick="send()">发送</button>
</div>
<script type="text/javascript">
var webSocket;
if (window.WebSocket) {
webSocket = new WebSocket("ws://localhost:8088/ws");
} else {
alert("抱歉，您的浏览器不支持WebSocket协议!");
}
//连通之后的回调事件
webSocket.onopen = function() {
console.log("已经连通了websocket");
// setMessageInnerHTML("已经连通了websocket");
};
//连接发生错误的回调方法
webSocket.onerror = function(event){
console.log("出错了");
// setMessageInnerHTML("连接失败");
};
//连接关闭的回调方法
webSocket.onclose = function(){
console.log("连接已关闭...");
}
//接收到消息的回调方法
webSocket.onmessage = function(event){
console.log("bbdds");
var data = JSON.parse(event.data)
var msg = data.msg;
var nick = data.sendUser;
switch(data.type){
case 'init':
console.log("mmll");
break;
case 'msg':
console.log("bblld");
setMessageInnerHTML(nick+": "+msg);
break;
default:
break;
}
}
function enter(){
var map = new Map();
var nick=document.getElementById('nick').value;
var room=document.getElementById('room').value;
map.set("type","init");
map.set("nick",nick);
console.log(room);
map.set("room",room);
var message = Map2Json(map);
webSocket.send(message);
}
function send() {
var msg = document.getElementById('text').value;
var nick = document.getElementById('nick').value;
console.log("1:"+msg);
if (msg != null && msg != ""){
var map = new Map();
map.set("type","msg");
map.set("msg",msg);
var map2json=Map2Json(map);
if (map2json.length < 8000){
console.log("4:"+map2json);
webSocket.send(map2json);
}else {
console.log("文本太长了，少写一点吧????");
}
}
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML) {
document.getElementById("message").innerHTML += innerHTML + "
";
}
function Map2Json(map) {
var str = "{";
map.forEach(function (value, key) {
str += '"'+key+'"'+':'+ '"'+value+'",';
})
str = str.substring(0,str.length-1)
str +="}";
return str;
}
</script>
</body>
</html>
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