Netty教程06：netty实现群聊私聊

netty实现群聊，点击查看

需求：在群聊基础上，增加私聊功能

Server

package com.lian.groupprivatechat;import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.GenericFutureListener;public class Server {//监听端口private Integer port;public Server(Integer port) {this.port = port;}//编写run方法，处理客户端的请求public void run() throws InterruptedException {//创建两个线程组NioEventLoopGroup bossGroup = new NioEventLoopGroup(1);NioEventLoopGroup workerGroup = new NioEventLoopGroup();try {//创建workerGroup启动类ServerBootstrap serverBootstrap = new ServerBootstrap();serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).option(ChannelOption.SO_BACKLOG,128).childOption(ChannelOption.SO_KEEPALIVE,true).childHandler(new ChannelInitializer<SocketChannel>() {@Overrideprotected void initChannel(SocketChannel ch) throws Exception {ChannelPipeline pipeline = ch.pipeline();//向pipeline里加入解码器pipeline.addLast("decoder",new StringDecoder());向pipeline里加入编码器pipeline.addLast("encoder",new StringEncoder());向pipeline里加入自定义业务处理器pipeline.addLast(new ServerHandler());}});System.out.println("netty server start");//绑定端口ChannelFuture channelFuture = serverBootstrap.bind(port).sync();//添加监听器channelFuture.addListener(new GenericFutureListener<Future<? super Void>>() {@Overridepublic void operationComplete(Future<? super Void> future) throws Exception {if (channelFuture.isSuccess()){System.out.println("server is startting...");}else if (channelFuture.isDone()){System.out.println("server started success...");}}});//监听关闭通道channelFuture.channel().closeFuture().sync();//添加监听器channelFuture.addListener(new GenericFutureListener<Future<? super Void>>() {@Overridepublic void operationComplete(Future<? super Void> future) throws Exception {if (channelFuture.isCancelled()){System.out.println("server is stopping...");}else if (channelFuture.isCancellable()){System.out.println("server was stopped...");}}});}finally {bossGroup.shutdownGracefully();workerGroup.shutdownGracefully();}}public static void main(String[] args) throws Exception {new Server(9999).run();}
}

ServerHandler

package com.lian.groupprivatechat;import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;public class ServerHandler extends SimpleChannelInboundHandler<String> {/*** 定义一个channle 组，管理所有的channel* GlobalEventExecutor.INSTANCE) 是全局的事件执行器，是一个单例*/private static DefaultChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);/*** 为了实现私聊功能，这里key存储用户的唯一标识,* 客户端的端口号* 当然 这个集合也需要自己去维护 用户的上下线 不能像 ChannelGroup那样自己去维护*/private static Map<String, Channel> map = new HashMap<>();//创建日期SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");/*** 服务器读取客户端的数据* @param ctx* @param msg* @throws Exception*/@Overrideprotected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {//获取当前通道Channel channel = ctx.channel();/*** 私聊，这里简单判断 如果内容里边包含#那么就是私聊*/if (msg.contains("#")){String id = msg.split("#")[0];String body = msg.split("#")[1];Channel userChannel = map.get(id);System.out.println("userChannel: "+userChannel);//求出远程地址的 key值9609  /127.0.0.1:9609String key = channel.remoteAddress().toString().split(":")[1];userChannel.writeAndFlush(sdf.format(new Date())+"\n client "+key+" say : "+body);}//判断当前消息是不是自己发送的,循环遍历channelGroup组中的channelchannelGroup.forEach(ch->{//如果循环遍历的不是当前的channel,就转发消息给其他客户if (channel != ch){ch.writeAndFlush("client"+channel.remoteAddress()+" send message "+msg+"\n");}else {//如果循环遍历到的是当前channel，就回显自己发送的消息给自己ch.writeAndFlush("self send message "+msg+"\n");}});}/*** handlerAdded 表示连接建立，一旦连接，第一个被执行* 将当前channel 加入到  channelGroup* 建立连接以后第一个调用的方法*/@Overridepublic void handlerAdded(ChannelHandlerContext ctx) throws Exception {Channel channel = ctx.channel();/*** 将该客户加入聊天的信息推送给其它在线的客户端* 该方法会将 channelGroup 中所有的channel 遍历，并发送 消息，* 我们不需要自己遍历*/channelGroup.writeAndFlush("client： "+channel.remoteAddress()+" join chatting"+" time is "+sdf.format(new Date())+"\n");channelGroup.add(channel);// /127.0.0.1:9394String key = channel.remoteAddress().toString().split(":")[1];map.put(key, channel);}/*** 表示channel 处于活动状态, 提示 xx上线* @param ctx* @throws Exception*/@Overridepublic void channelActive(ChannelHandlerContext ctx) throws Exception {Channel channel = ctx.channel();System.out.println(channel.remoteAddress()+" on-line...");}/*** 表示channel 处于不活动状态, 提示 xx离线了* @param ctx* @throws Exception*/@Overridepublic void channelInactive(ChannelHandlerContext ctx) throws Exception {Channel channel = ctx.channel();System.out.println(channel.remoteAddress()+" off-line...");//下线移除String key = channel.remoteAddress().toString().split(":")[1];map.remove(key);}/*** 断开连接，将xx客户离开的消息推送给当前在线的其他客户，有人下线了通知到其他在线的人*/@Overridepublic void handlerRemoved(ChannelHandlerContext ctx) throws Exception {Channel channel = ctx.channel();channelGroup.writeAndFlush("client "+channel.remoteAddress()+" leaving\n");System.out.println("channelGroup size"+channelGroup.size());System.out.println("map size: "+map.size());}/*** 捕获异常* @param ctx* @param cause* @throws Exception*/@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {//出现异常关闭通道ctx.channel().close();}
}

Client

package com.lian.groupprivatechat;import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;import java.util.Scanner;public class Client {private final String host;private final Integer port;public Client(String host, Integer port) {this.host = host;this.port = port;}public void run() throws Exception {NioEventLoopGroup clientEventLoopGroup = new NioEventLoopGroup();try {Bootstrap bootstrap = new Bootstrap();bootstrap.group(clientEventLoopGroup).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {@Overrideprotected void initChannel(SocketChannel ch) throws Exception {ChannelPipeline pipeline = ch.pipeline();pipeline.addLast("decoder",new StringDecoder());pipeline.addLast("encoder",new StringEncoder());pipeline.addLast(new ClientHandler());}});//绑定主机和端口ChannelFuture channelFuture = bootstrap.connect(host,port).sync();//添加监听器channelFuture.addListener(new GenericFutureListener<Future<? super Void>>() {@Overridepublic void operationComplete(Future<? super Void> future) throws Exception {if (channelFuture.isSuccess()){System.out.println("client is startting...");}else if (channelFuture.isDone()){System.out.println("client is start success...");}}});Channel channel = channelFuture.channel();System.out.println("----------"+channel.localAddress()+"-----------");//创建扫描器Scanner scanner = new Scanner(System.in);while (scanner.hasNextLine()){String msg = scanner.nextLine();//将控制台上的数据写入到channel中channel.writeAndFlush(msg+"\r\n");}//监听关闭通道channelFuture.channel().closeFuture().sync();scanner.close();}finally {clientEventLoopGroup.shutdownGracefully();}}public static void main(String[] args) throws Exception {new Client("127.0.0.1",9999).run();}
}

ClientHandler

package com.lian.groupprivatechat;import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;public class ClientHandler extends SimpleChannelInboundHandler<String> {@Overrideprotected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {System.out.println(msg.trim());}@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {cause.printStackTrace();ctx.channel().close();}
}

测试

----------/127.0.0.1:13983-----------
client�� /127.0.0.1:14023 join chatting time is 2021-04-12 20:23:25
2021-04-12 20:23:35client 14023 say : you are a son//id # message
14023 # i am your parent
self send message

----------/127.0.0.1:14023-----------
13983 # you are a son
client/127.0.0.1:13983 send message 2021-04-12 20:24:00client 13983 say : i am your parent

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Netty教程06：netty实现群聊私聊

Server

ServerHandler

Client

ClientHandler

测试

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