一、引入pom
4.0.0 com.chat.info chat-server 1.0-SNAPSHOT org.springframework.boot spring-boot-starter-parent 2.1.4.RELEASE UTF-8 1.8 org.springframework.boot spring-boot-starter-web io.netty netty-all 4.1.33.Final org.projectlombok lombok com.alibaba fastjson 1.2.56 org.springframework.boot spring-boot-starter-thymeleaf org.springframework.boot spring-boot-maven-plugin
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{ @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{ @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 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 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 concurrentHashMap = new ConcurrentHashMap();
}
四、客户端html
Title
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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