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Java实战之用springboot+netty实现简单的一对一聊天

作者：caiyang2015　　发布时间：2023-12-03 07:28:19　

标签：Java,springboot,netty,聊天,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/> 
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>

<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>

<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

来源：https://blog.csdn.net/u014190164/article/details/116093343

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