Java实战之用springboot+netty实现简单的一对一聊天

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
@Slf4j
public 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;

@Slf4j
public 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;
@Controller
public 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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