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。
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() {
@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
public class NettyGroupChatServerHandler extends SimpleChannelInboundHandler{ //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
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() {
@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
public class NettyGroupChatClientHandler extends SimpleChannelInboundHandler{ @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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