SpringBoot快速搭建TCP服务端和客户端全过程

<dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-all</artifactId>
  <version>4.1.25.Final</version>
</dependency>

@Component
@Slf4j
@Data
@ConfigurationProperties(prefix = "tcp.server")
public class TCPServer implements CommandLineRunner {
    private Integer port;

    @Override
    public void run(String... args) throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(bossGroup, workerGroup)
            .channel(NioServerSocketChannel.class)
            .childHandler(new ChannelInitializer<Channel>() {
                @Override
                protected void initChannel(Channel channel) throws Exception {
                    ChannelPipeline pipeline = channel.pipeline();
                    pipeline.addLast(new StringEncoder());
                    pipeline.addLast(new StringDecoder());
                    pipeline.addLast(new TCPServerHandler());
                }
            })
            .option(ChannelOption.SO_BACKLOG, 128)
            .childOption(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture future = bootstrap.bind(port).sync();
            log.info("TCP server started and listening on port " + port);

            future.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }
}

tcp:
 server:
  port: 8888 #服务器端口

@Slf4j
@Component
public class TCPServerHandler extends SimpleChannelInboundHandler<String> {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) {
        log.info("收到客户端消息:/n"+ msg);
        Object parse = JSONUtils.parse(msg);
        System.out.println("parse = " + parse);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        log.error("TCPServer出现异常", cause);
        ctx.close();
    }
}

<dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-all</artifactId>
  <version>4.1.25.Final</version>
</dependency>

@Component
@Slf4j
@Data
@ConfigurationProperties(prefix = "tcp.client")
public class TCPClient implements CommandLineRunner {
    private String host ;
    private Integer port;
    @Override
    public void run(String... args) throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap()
                    .group(group)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            pipeline.addLast(new StringEncoder());
                            pipeline.addLast(new StringDecoder());
                            pipeline.addLast(new TCPClientHandler());
                        }
                    });
            ChannelFuture future = bootstrap.connect(host, port).sync();
            log.info("TCPClient Start , Connect host:"+host+":"+port);
            future.channel().closeFuture().sync();
        } catch (Exception e) {
            log.error("TCPClient Error", e);
        } finally {
            group.shutdownGracefully();
        }
    }
}

tcp:
 client:
  port: 8080 #连接的服务器端口
  host: 127.0.0.1 #连接的服务器域名

@Slf4j
@Component
public class TCPClientHandler extends SimpleChannelInboundHandler<String> {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) {
        log.info("Receive TCPServer Message:\n"+ msg);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        log.error("TCPClient Error", cause);
        ctx.close();
    }
}