服务端
服务端一样的需要创建bossgroup 和 workgroup , 然后使用serverbootstrap 来配置netty和启动netty。
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public class nettygroupchatserver { public static void main(string[] args) { new nettygroupchatserver().start(); } //监听 public void start(){ //循环组 nioeventloopgroup bossgroup = new nioeventloopgroup(); nioeventloopgroup workgroup = new nioeventloopgroup(); //启动引导 serverbootstrap bootstrap = new serverbootstrap(); //netty配置 bootstrap.group(bossgroup,workgroup) .option(channeloption.so_backlog, 32 ) .childoption(channeloption.so_keepalive, true ) .channel(nioserversocketchannel. class ) .childhandler( new channelinitializer<socketchannel>() { @override protected void initchannel(socketchannel channel) throws exception { //解码器 channel.pipeline().addlast( "decoder" , new stringdecoder()); //编码器 channel.pipeline().addlast( "encoder" , new stringencoder()); //处理器 channel.pipeline().addlast( "nettygroupchathandler" , new nettygroupchatserverhandler()); } }); try { //启动服务 channelfuture future = bootstrap.bind( new inetsocketaddress( "127.0.0.1" , 8888 )).sync(); future.channel().closefuture().sync(); } catch (interruptedexception e) { e.printstacktrace(); } finally { //关闭资源 bossgroup.shutdowngracefully(); workgroup.shutdowngracefully(); } } } |
服务端处理器我们通过继承 simplechannelinboundhandler 入站handler来处理消息。
其中提供了几个方法
channelread0 ()：读取消息 handlerremoved ()：客户端断开 handleradded ()：客户端建立连接 exceptioncaught ()：出现异常具体代码如下
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public class nettygroupchatserverhandler extends simplechannelinboundhandler<string> { //把所有客户端的channel保存起来 private static channelgroup channels = new defaultchannelgroup(globaleventexecutor.instance); private static simpledateformat dateformat = new simpledateformat( "yyyy-mm-dd hh:mm:ss" ); @override protected void channelread0(channelhandlercontext ctx, string msg) throws exception { string message = dateformat.format( new date())+ ":%s:" +msg; //消息转发给所有的客户端 channels.foreach(channel -> { if (channel == ctx.channel()){ string sendmsg = string.format(message, "我" ); channel.writeandflush(sendmsg); system.out.println(sendmsg);
} else { string sendmsg = string.format(message, ctx.channel().remoteaddress()); channel.writeandflush(sendmsg); system.out.println(sendmsg); } }); } //断开连接 , 把消息广播给其他客户端 @override public void handlerremoved(channelhandlercontext ctx) throws exception { string message = dateformat.format( new date())+ ":" +ctx.channel().remoteaddress()+ ":断开连接" ; channels.writeandflush(message); system.out.println(message); } //建立连接 @override public void handleradded(channelhandlercontext ctx) throws exception { string message = dateformat.format( new date())+ ":" +ctx.channel().remoteaddress()+ ":加入聊天室" ; //自动把消息广播给其客户端 channels.writeandflush(message); //客户端加入组 channels.add(ctx.channel()); system.out.println(message); } //出现异常 @override public void exceptioncaught(channelhandlercontext ctx, throwable cause) throws exception { ctx.channel().close(); } //客户端退出 @override public void channelinactive(channelhandlercontext ctx) throws exception { string message = dateformat.format( new date())+ ":" +ctx.channel().remoteaddress()+ ":退出聊天室" ; system.out.println(message); } //客户端出于活动 @override public void channelactive(channelhandlercontext ctx) throws exception { string message = dateformat.format( new date())+ ":" +ctx.channel().remoteaddress()+ ":上线啦" ; system.out.println(message); } } |
客户端
客户端需要创建一个循环事件组，然后通过bootstrap去启动,然后扫描键盘输入作为数据源来把信息发送给服务端
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public class nettygroupchatclient { public static void main(string[] args) { new nettygroupchatclient().start(); } public void start(){ nioeventloopgroup eventloopgroup = new nioeventloopgroup(); bootstrap bootstrap = new bootstrap(); bootstrap.group(eventloopgroup) .channel(niosocketchannel. class ) .handler( new channelinitializer<socketchannel>() { @override protected void initchannel(socketchannel channel) throws exception { //解码器 channel.pipeline().addlast( "decoder" , new stringdecoder()); //编码器 channel.pipeline().addlast( "encoder" , new stringencoder()); //处理器 channel.pipeline().addlast( "nettygroupchatclienthandler" , new nettygroupchatclienthandler()); } }); try { channelfuture future = bootstrap.connect( new inetsocketaddress( "127.0.0.1" , 8888 )).sync(); //通道 channel channel = future.channel(); //扫描键盘输入 scanner scanner = new scanner(system.in); while (scanner.hasnextline()){ string message = scanner.nextline(); //发送数据 channel.writeandflush(message); } } catch (interruptedexception e) { } finally { eventloopgroup.shutdowngracefully(); } } } |
对于处理器只需要接收服务端转发过来的消息即可
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public class nettygroupchatclienthandler extends simplechannelinboundhandler<string> { @override protected void channelread0(channelhandlercontext ctx, string msg) throws exception { system.out.println(msg); } } |
启动服务端和多个客户端，效果如下
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原文链接：https://blog.csdn.net/u014494148/article/details/119721394
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