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();
}
}
}
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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);
}
}
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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();
}
}
}
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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);
}
}
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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