Java netty发送接收（TCP、UDP）

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最下方附项目地址

依赖

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
</dependency>

yml配置

gps:
  netty:
    tcp:
      port: 8888
      read-timeout: 15 #读超时 15分钟
    udp:
      port: 7777
    threads:
      boss: 1
      worker: 4
      business:
        num: 1 #业务线程数量
        max-pending: 100000

配置类

@Configuration
public class EventLoopGroupConfig {

    @Value("${gps.netty.threads.boss}")
    private int bossNum;

    @Value("${gps.netty.threads.worker}")
    private int workerNum;

    @Value("${gps.netty.threads.business.num}")
    private int businessNum;

	@Value("${gps.netty.threads.business.max-pending}")
    private int maxPending;


    /**
     * TCP连接处理
     * @return
     */
    @Bean(name = "bossGroup")
    public NioEventLoopGroup bossGroup() {
        return new NioEventLoopGroup(bossNum);
    }

    /**
     * Socket数据读写
     * @return
     */
    @Bean(name = "workerGroup")
    public NioEventLoopGroup workerGroup() {
        return new NioEventLoopGroup(workerNum);
    }

    /**
     * Handler业务处理
     * @return
     */
    @Bean(name = "businessGroup")
    public EventExecutorGroup businessGroup() {
        return new DefaultEventExecutorGroup(businessNum,new BusinessThreadFactory(),maxPending, RejectedExecutionHandlers.reject());
    }
    
    static class BusinessThreadFactory implements ThreadFactory {
        private final ThreadGroup group;
        private final AtomicInteger threadNumber = new AtomicInteger(1);
        private final String namePrefix;

        BusinessThreadFactory() {
            SecurityManager s = System.getSecurityManager();
            group = (s != null) ? s.getThreadGroup() :
                                  Thread.currentThread().getThreadGroup();
            namePrefix = "business-thread-";
        }

        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(group, r,
                                  namePrefix + threadNumber.getAndIncrement(),
                                  0);
            if (t.isDaemon()){
                t.setDaemon(false);
            }

            if (t.getPriority() != Thread.NORM_PRIORITY){
                t.setPriority(Thread.NORM_PRIORITY);
            }
            return t;
        }
    }

}

TcpServer

@Slf4j
@Component
public class NettyTcpServer implements ApplicationListener<ApplicationStartedEvent> {

    @Value("${gps.netty.tcp.port}")
    private int port;
    
    @Value("${gps.netty.tcp.read-timeout}")
    private int readTimeOut;

    @Autowired
    @Qualifier("bossGroup")
    private NioEventLoopGroup bossGroup;

    @Autowired
    @Qualifier("workerGroup")
    private NioEventLoopGroup workerGroup;
    
    @Autowired
    @Qualifier("businessGroup")
    private EventExecutorGroup businessGroup;

    @Autowired
    private TcpServerHandler tcpServerHandler;

    /**
     * 启动Server
     *
     */
    @Override
	public void onApplicationEvent(ApplicationStartedEvent event) {
    	try {
	        ServerBootstrap serverBootstrap = new ServerBootstrap();
	        serverBootstrap.group(bossGroup, workerGroup)
	                .channel(NioServerSocketChannel.class)
	                .childHandler(new ChannelInitializer<SocketChannel>() { //
						@Override
						public void initChannel(SocketChannel ch) throws Exception {
							ch.pipeline().addLast(new IdleStateHandler(readTimeOut, 0, 0, TimeUnit.MINUTES));
							// 1024表示单条消息的最大长度，解码器在查找分隔符的时候，达到该长度还没找到的话会抛异常
							ch.pipeline().addLast(
									new DelimiterBasedFrameDecoder(1024, Unpooled.copiedBuffer(new byte[] { MsgUtil.DELIMITER }),
											Unpooled.copiedBuffer(new byte[] { MsgUtil.DELIMITER, MsgUtil.DELIMITER })));
							ch.pipeline().addLast(businessGroup,tcpServerHandler);
						}
					})
	                .option(ChannelOption.SO_BACKLOG, 1024) //服务端可连接队列数,对应TCP/IP协议listen函数中backlog参数
	                .childOption(ChannelOption.TCP_NODELAY, true)//立即写出
	                .childOption(ChannelOption.SO_KEEPALIVE, true);//长连接
	        ChannelFuture channelFuture = serverBootstrap.bind(port).sync();
	        if (channelFuture.isSuccess()) {
				log.info("TCP服务启动完毕,port={}", port);
	        }
    	}catch(Exception e) {
			log.info("TCP服务启动失败", e);
    	}
    }

    /**
     * 销毁资源
     */
    @PreDestroy
    public void destroy() {
        bossGroup.shutdownGracefully().syncUninterruptibly();
        workerGroup.shutdownGracefully().syncUninterruptibly();
        log.info("TCP服务关闭成功");
    }
}

UdpServer

@Slf4j
@Configuration
public class NettyUdpServer implements ApplicationListener<ApplicationStartedEvent> {

    @Value("${gps.netty.udp.port}")
    private int port;

    @Resource
    private UdpServerHandler udpServerHandler;

    private EventLoopGroup group = null;

    @Override
    public void onApplicationEvent(@NonNull ApplicationStartedEvent event) {

        try {
            Bootstrap b = new Bootstrap();
            String osName= SystemPropertyUtil.get("os.name").toLowerCase();
            if("linux".equals(osName)) {
                group = new EpollEventLoopGroup();
                b.group(group)
                        .channel(EpollDatagramChannel.class);
            }else {
                group = new NioEventLoopGroup();
                b.group(group)
                        .channel(NioDatagramChannel.class);
            }
            //广播
            b.option(ChannelOption.SO_BROADCAST, true)
                    //接收缓存区  10M
                    .option(ChannelOption.SO_RCVBUF, 1024 * 1024 * 10 )
                    //发送缓存区  10M
                    .option(ChannelOption.SO_SNDBUF, 1024 * 1024 * 10 )
                    .handler(udpServerHandler);

            ChannelFuture channelFuture = b.bind(port).sync();
            if (channelFuture.isSuccess()) {
                log.info("UDP服务启动完毕,port={}", port);
            }

        } catch (InterruptedException e) {
            log.info("UDP服务启动失败", e);
        }

    }

    /**
     * 销毁资源
     */
    @PreDestroy
    public void destroy() {
        if(group!=null) {
            group.shutdownGracefully();
        }
        log.info("UDP服务关闭成功");
    }
}

TcpHandler

@Slf4j
@ChannelHandler.Sharable
@Component
public class TcpServerHandler extends SimpleChannelInboundHandler<ByteBuf> {

	@Autowired
	private KafkaSender kafkaSender;

	@Autowired
	@Qualifier("businessGroup")
	private EventExecutorGroup businessGroup;

    /**
     * 使用
     * @param ctx
     * @param byteBuf
     * @throws Exception
     */
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, ByteBuf byteBuf) {
		String content = byteBuf.toString(StandardCharsets.UTF_8);

		log.info("TCP服务端接收到消息：{}",  content);


		ByteBuf buf = Unpooled.copiedBuffer("TCP已经接收到消息：".getBytes(StandardCharsets.UTF_8));

		businessGroup.execute(()->{
			try {
				kafkaSender.sendMessage("hello", content);
				send2client(ctx,buf.array());
			}catch(Throwable e) {
				log.error("TCP数据接收处理出错",e);
				ByteBuf err = Unpooled.copiedBuffer("系统错误：".getBytes(StandardCharsets.UTF_8));
				send2client(ctx,err.array());
			}
		});

    }
    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
    	log.error("TCP数据接收处理出错：",cause);
    }

    /**
     * 返回消息给客户端
     * @param ctx
     * @param msg
     */
    void send2client(ChannelHandlerContext ctx, byte[] msg) {
    	ByteBuf buf= Unpooled.buffer(msg.length+1);
    	buf.writeBytes(msg);
    	buf.writeByte(MsgUtil.DELIMITER);
    	ctx.writeAndFlush(buf).addListener(future->{
    		if(!future.isSuccess()) {
				log.error("TCP发送给客户端消息失败");
    		}
    	});
    }
}

UdpHandler

@ChannelHandler.Sharable
@Component
@Slf4j
public class UdpServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    @Autowired
    @Qualifier("businessGroup")
    private EventExecutorGroup businessGroup;

   @Autowired
   private KafkaSender kafkaSender;

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception {
        String content = packet.content().toString(StandardCharsets.UTF_8);

        log.info("UDP服务端接收到消息：{}",  content);


        ByteBuf buf = Unpooled.copiedBuffer("UDP已经接收到消息：".getBytes(StandardCharsets.UTF_8));


        businessGroup.execute(()->{
            try {
                kafkaSender.sendMessage("hello", content);
                ctx.writeAndFlush(new DatagramPacket(buf, packet.sender()));
            }catch(Throwable e) {
                log.info("UDP数据接收处理出错{}",  e);
            }
        });
    }

Tcp消息发送

@Slf4j
@RestController
public class TcpClientController {

    @Value("${gps.netty.tcp.port}")
    private int port;

    @PostMapping("sendTcp")
    public String send(String msg){
        EventLoopGroup group = new NioEventLoopGroup();
        Bootstrap b = new Bootstrap();
        Channel ch =null;
        TcpServerHandler handler=new TcpServerHandler();

        try {
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<NioSocketChannel>() {
                        @Override
                        protected void initChannel(NioSocketChannel ch) throws Exception {
                            ch.pipeline().addLast(
                                    new DelimiterBasedFrameDecoder(1024, Unpooled.copiedBuffer(new byte[] { 0x7e }),
                                            Unpooled.copiedBuffer(new byte[] { 0x7e, 0x7e })));
                            ch.pipeline().addLast(handler);
                        }});
            ch =b.connect("localhost", port).sync().channel();

        } catch (Exception e) {
            e.printStackTrace();
        }

        ByteBuf tcpMsg = Unpooled.copiedBuffer(msg.getBytes(StandardCharsets.UTF_8));

        ByteBuf buf= Unpooled.buffer(msg.length() + 1);
        try{
            log.info("TCP客户端发送消息：{}", msg);
            buf.writeBytes(tcpMsg);//消息体
            buf.writeByte(MsgUtil.DELIMITER);//消息分割符
            ch.writeAndFlush(buf).sync();
        }catch (Exception e){
            log.info("TCP客户端发送消息失败：{}", e);
        }

        //关闭链接
        group.shutdownGracefully();
        return "success";
    }

Udp消息发送

@Slf4j
@RestController
public class UdpClientController {

    @Value("${gps.netty.udp.port}")
    private int port;

    @PostMapping("sendUdp")
    public String send(String msg){
        EventLoopGroup group = new NioEventLoopGroup();
        Bootstrap b = new Bootstrap();
        Channel ch =null;
        UdpServerHandler handler=new UdpServerHandler();

        try {
            b.group(group)
                    .channel(NioDatagramChannel.class)
                    .option(ChannelOption.SO_BROADCAST, true)
                    .handler(new ChannelInitializer<NioDatagramChannel>() {

                        @Override
                        protected void initChannel(NioDatagramChannel ch) throws Exception {
                            ch.pipeline().addLast(handler.getClass().getSimpleName(),handler);
                        }});
            ch =b.bind(0).sync().channel();
        } catch (Exception e) {
            e.printStackTrace();
        }

        ByteBuf buf = Unpooled.copiedBuffer(msg.getBytes(StandardCharsets.UTF_8));

        try{
            log.info("UDP客户端发送消息：{}", msg);
            ch.writeAndFlush(new DatagramPacket(
                    Unpooled.copiedBuffer(buf.array()),
                    SocketUtils.socketAddress("localhost", port))).sync();
        }catch (Exception e){
            log.info("UDP客户端发送消息失败：{}", e);
        }

        //关闭链接
        group.shutdownGracefully();
        return "success";
    }
}

项目地址https://gitee.com/xn-mg/netty_kafka文章来源地址https://www.toymoban.com/news/detail-595660.html

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