Java實戰之用springboot+netty實現簡單的一對一聊天

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、創建netty 服務端

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("開始啟動聊天服務器");
        bossGroup = new NioEventLoopGroup(1);
        workGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChatServerInitializer());
            //啟動服務器
            ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
            log.info("開始啟動聊天服務器結束");
            channelFuture.channel().closeFuture().sync();
 
        } finally {
            bossGroup.shutdownGracefully();
            workGroup.shutdownGracefully();
        }
 
    }
 
    /**
     * 初始化服務器
     */
    @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的編碼器和解碼器
        pipeline.addLast(new HttpServerCodec());
        //添加塊處理器
        pipeline.addLast(new ChunkedWriteHandler());
 
        pipeline.addLast(new HttpObjectAggregator(8192));
 
        pipeline.addLast(new WebSocketServerProtocolHandler("/chat"));
        //自定義handler,處理業務邏輯
        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 {
        //傳過來的是json字符串
        String text = textWebSocketFrame.text();
        JSONObject jsonObject = JSON.parseObject(text);
        //獲取到發送人的用戶id
        Object msg = jsonObject.get("msg");
        String userId = (String) jsonObject.get("userId");
        Channel channel = channelHandlerContext.channel();
        if (msg == null) {
            //說明是第一次登錄上來連接,還沒有開始進行聊天,將uid加到map裡面
            register(userId, channel);
        } else {
            //有消息瞭,開始聊天瞭
            sendMsg(msg, userId);
        }
 
    }
 
    /**
     * 第一次登錄進來
     *
     * @param userId
     * @param channel
     */
    private void register(String userId, Channel channel) {
        if (!ChatConfig.concurrentHashMap.containsKey(userId)) { //沒有指定的userId
            ChatConfig.concurrentHashMap.put(userId, channel);
            // 將用戶ID作為自定義屬性加入到channel中,方便隨時channel中獲取用戶ID
            AttributeKey<String> key = AttributeKey.valueOf("userId");
            channel.attr(key).setIfAbsent(userId);
        }
    }
 
    /**
     * 開發發送消息,進行聊天
     *
     * @param msg
     * @param userId
     */
    private void sendMsg(Object msg, String userId) {
        Channel channel1 = ChatConfig.concurrentHashMap.get(userId);
        if (channel1 != null) {
            channel1.writeAndFlush(new TextWebSocketFrame("服務器時間" + LocalDateTime.now() + " " + msg));
        }
    }
 
 
    /**
     * 一旦客戶端連接上來,該方法被執行
     *
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        log.info("handlerAdded 被調用" + ctx.channel().id().asLongText());
    }
 
    /**
     * 斷開連接,需要移除用戶
     *
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        removeUserId(ctx);
    }
 
    /**
     * 移除用戶
     *
     * @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("用戶下線,userId:{}", userId);
    }
 
    /**
     * 處理移除,關閉通道
     *
     * @param ctx
     * @param cause
     * @throws Exception
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}

三、存儲用戶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、客戶端html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        var socket;
        //判斷當前瀏覽器是否支持websocket
        if (window.WebSocket) {
            //go on
            socket = new WebSocket("ws://localhost:7000/chat");
            //相當於channelReado, ev 收到服務器端回送的消息
            socket.onmessage = function (ev) {
                var rt = document.getElementById("responseText");
                rt.value = rt.value + "\n" + ev.data;
            }
 
            //相當於連接開啟(感知到連接開啟)
            socket.onopen = function (ev) {
                var rt = document.getElementById("responseText");
                rt.value = "連接開啟瞭.."
                var userId = document.getElementById("userId").value;
                var myObj = {userId: userId};
                var myJSON = JSON.stringify(myObj);
                socket.send(myJSON)
            }
 
            //相當於連接關閉(感知到連接關閉)
            socket.onclose = function (ev) {
                var rt = document.getElementById("responseText");
                rt.value = rt.value + "\n" + "連接關閉瞭.."
            }
        } else {
            alert("當前瀏覽器不支持websocket")
        }
 
        //發送消息到服務器
        function send(message) {
            if (!window.socket) { //先判斷socket是否創建好
                return;
            }
            if (socket.readyState == WebSocket.OPEN) {
                //通過socket 發送消息
                var sendId = document.getElementById("sendId").value;
                var myObj = {userId: sendId, msg: message};
                var messageJson = JSON.stringify(myObj);
                socket.send(messageJson)
            } else {
                alert("連接沒有開啟");
            }
        }
    </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="發送" onclick="send(this.form.message.value)">
    <textarea id="responseText" style="height: 300px; width: 300px"></textarea>
    <input type="button" value="清空內容" onclick="document.getElementById('responseText').value=''">
</form>
</body>
</html>

五、controller 模擬用戶登錄以及要發送信息給誰

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、測試

登錄成功要發消息給bbb

登錄成功要發消息給aaa

 

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