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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