目录一、引入pom二、创建netty服务端三、存储用户channel的map四、客户端html五、controller模拟用户登录以及要发送信息给谁六、测试
一、引入pom
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.chat.info</groupId> <artifactId>chat-server</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <!-- web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>4.1.33.Final</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> <!-- fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.56</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
二、创建netty服务端
package com.chat.server; import io.netty.bootstrap.ServerBootstrap;import io.netty.channel.ChannelFuture;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.nio.NioServerSocketChannel;import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Component; import javax.annotation.PostConstruct;import javax.annotation.PreDestroy; @Component@Slf4jpublic class ChatServer { private EventLoopGroup bossGroup; private EventLoopGroup workGroup; private void run() throws Exception { log.info("开始启动聊天服务器"); bossGroup = new NioEventLoopGroup(1); workGroup = new NioEventLoopGroup(); try { ServerBootstrap serverBootstrap = new ServerBootstrap(); serverBootstrap.group(bossGroup, workGroup) .channel(NioServerSocketChannel.class) .childHandler(new ChatServerInitializer()); //启动服务器 ChannelFuture channelFuture = serverBootstrap.bind(7000).sync(); log.info("开始启动聊天服务器结束"); channelFuture.channel().closeFuture().sync(); } finally { bossGroup.shutdownGracefully(); workGroup.shutdownGracefully(); } } /** * 初始化服务器 */ @PostConstruct() public void init() { new Thread(() -> { try { run(); } catch (Exception e) { e.printStackTrace(); } }).start(); } @PreDestroy public void destroy() throws InterruptedException { if (bossGroup != null) { bossGroup.shutdownGracefully().sync(); } if (workGroup != null) { workGroup.shutdownGracefully().sync(); } }}
package com.chat.server; import io.netty.channel.ChannelInitializer;import io.netty.channel.ChannelPipeline;import io.netty.channel.socket.SocketChannel;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.stream.ChunkedWriteHandler; public class ChatServerInitializer extends ChannelInitializer<SocketChannel> { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { ChannelPipeline pipeline = socketChannel.pipeline(); //使用http的编码器和解码器 pipeline.addLast(new HttpServerCodec()); //添加块处理器 pipeline.addLast(new ChunkedWriteHandler()); pipeline.addLast(new HttpObjectAggregator(8192)); pipeline.addLast(new WebSocketServerProtocolHandler("/chat")); //自定义handler,处理业务逻辑 pipeline.addLast(new ChatServerHandler()); }}
package com.chat.server; import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.chat.config.ChatConfig;import io.netty.channel.Channel;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.SimpleChannelInboundHandler;import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;import io.netty.util.AttributeKey;import lombok.extern.slf4j.Slf4j; import java.time.LocalDateTime; @Slf4jpublic class ChatServerHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> { @Override protected void channelRead0(ChannelHandlerContext channelHandlerContext, TextWebSocketFrame textWebSocketFrame) throws Exception { //传过来的是json字符串 String text = textWebSocketFrame.text(); JSONObject jsonObject = JSON.parseObject(text); //获取到发送人的用户id Object msg = jsonObject.get("msg"); String userId = (String) jsonObject.get("userId"); Channel channel = channelHandlerContext.channel(); if (msg == null) { //说明是第一次登录上来连接，还没有开始进行聊天，将uid加到map里面 register(userId, channel); } else { //有消息了,开始聊天了 sendMsg(msg, userId); } } /** * 第一次登录进来 * * @param userId * @param channel */ private void register(String userId, Channel channel) { if (!ChatConfig.concurrentHashMap.containsKey(userId)) { //没有指定的userId ChatConfig.concurrentHashMap.put(userId, channel); // 将用户ID作为自定义属性加入到channel中，方便随时channel中获取用户ID AttributeKey<String> key = AttributeKey.valueOf("userId"); channel.attr(key).setIfAbsent(userId); } } /** * 开发发送消息，进行聊天 * * @param msg * @param userId */ private void sendMsg(Object msg, String userId) { Channel channel1 = ChatConfig.concurrentHashMap.get(userId); if (channel1 != null) { channel1.writeAndFlush(new TextWebSocketFrame("服务器时间" + LocalDateTime.now() + " " + msg)); } } /** * 一旦客户端连接上来，该方法被执行 * * @param ctx * @throws Exception */ @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { log.info("handlerAdded 被调用" + ctx.channel().id().asLongText()); } /** * 断开连接，需要移除用户 * * @param ctx * @throws Exception */ @Override public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { removeUserId(ctx); } /** * 移除用户 * * @param ctx */ private void removeUserId(ChannelHandlerContext ctx) { Channel channel = ctx.channel(); AttributeKey<String> key = AttributeKey.valueOf("userId"); String userId = channel.attr(key).get(); ChatConfig.concurrentHashMap.remove(userId); log.info("用户下线,userId：{}", userId); } /** * 处理移除，关闭通道 * * @param ctx * @param cause * @throws Exception */ @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { ctx.close(); }}
三、存储用户channel的map
package com.chat.config; import io.netty.channel.Channel; import java.util.concurrent.ConcurrentHashMap; public class ChatConfig { public static ConcurrentHashMap<String, Channel> concurrentHashMap = new ConcurrentHashMap(); }
四、客户端html
<!DOCTYPE html><html lang="en" xmlns:th="http://www.thymeleaf.org"><head> <meta charset="UTF-8"> <title>Title</title> <script> var socket; //判断当前浏览器是否支持websocket if (window.WebSocket) { //go on socket = new WebSocket("ws://localhost:7000/chat"); //相当于channelReado, ev 收到服务器端回送的消息 socket.onmessage = function (ev) { var rt = document.getElementById("responseText"); rt.value = rt.value + "\n" + ev.data; } //相当于连接开启(感知到连接开启) socket.onopen = function (ev) { var rt = document.getElementById("responseText"); rt.value = "连接开启了.." var userId = document.getElementById("userId").value; var myObj = {userId: userId}; var myJSON = JSON.stringify(myObj); socket.send(myJSON) } //相当于连接关闭(感知到连接关闭) socket.onclose = function (ev) { var rt = document.getElementById("responseText"); rt.value = rt.value + "\n" + "连接关闭了.." } } else { alert("当前浏览器不支持websocket") } //发送消息到服务器 function send(message) { if (!window.socket) { //先判断socket是否创建好 return; } if (socket.readyState == WebSocket.OPEN) { //通过socket 发送消息 var sendId = document.getElementById("sendId").value; var myObj = {userId: sendId, msg: message}; var messageJson = JSON.stringify(myObj); socket.send(messageJson) } else { alert("连接没有开启"); } } </script></head><body><h1 th:text="${userId}"></h1><input type="hidden" th:value="${userId}" id="userId"><input type="hidden" th:value="${sendId}" id="sendId"><form onsubmit="return false"> <textarea name="message" style="height: 300px; width: 300px"></textarea> <input type="button" value="发送" onclick="send(this.form.message.value)"> <textarea id="responseText" style="height: 300px; width: 300px"></textarea> <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''"></form></body></html>
五、controller模拟用户登录以及要发送信息给谁
package com.chat.controller; import com.chat.config.ChatConfig;import io.netty.channel.Channel;import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestParam;@Controllerpublic class ChatController { @GetMapping("login") public String login(Model model, @RequestParam("userId") String userId, @RequestParam("sendId") String sendId) { model.addAttribute("userId", userId); model.addAttribute("sendId", sendId); return "chat"; } @GetMapping("sendMsg") public String login(@RequestParam("sendId") String sendId) throws InterruptedException { while (true) { Channel channel = ChatConfig.concurrentHashMap.get(sendId); if (channel != null) { channel.writeAndFlush(new TextWebSocketFrame("test")); Thread.sleep(1000); } } } }
六、测试
登录成功要发消息给bbb
登录成功要发消息给aaa
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做对的事情比把事情做对重要。
