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