springboot整合netty过程详解

    
      io.netty
      netty-all
      5.0.0.Alpha1
    

@Component
public class DiscardServer {
  @Resource
  private ChildChannelHandler childChannelHandler;
  public void run(int port) throws Exception {
    EventLoopGroup bossGroup = new NioEventLoopGroup();
    EventLoopGroup workerGroup = new NioEventLoopGroup();
    System.out.println("准备运行端口：" + port);
    try {
      ServerBootstrap bootstrap = new ServerBootstrap();
      bootstrap.group(bossGroup, workerGroup)
          .channel(NioServerSocketChannel.class)
          .option(ChannelOption.SO_BACKLOG, 128)
          .childHandler(childChannelHandler);
      //绑定端口，同步等待成功
      ChannelFuture f = bootstrap.bind(port).sync();
      //等待服务监听端口关闭
      f.channel().closeFuture().sync();
    } finally {
      //退出，释放线程资源
      workerGroup.shutdownGracefully();
      bossGroup.shutdownGracefully();
    }
  }
}

@Component
public class ChildChannelHandler extends ChannelInitializer {
  @Resource
  private DiscardServerHandler discardServerHandler;

  public void initChannel(SocketChannel socketChannel) throws Exception {
    socketChannel.pipeline().addLast(discardServerHandler);
  }
}

@Component
@Sharable
public class DiscardServerHandler extends ChannelHandlerAdapter {
  @Resource
  private BaseService baseService;
  @Override
  public void channelRead(ChannelHandlerContext ctx, Object msg) {

    try {
      ByteBuf in = (ByteBuf) msg;
      System.out.println("传输内容是");
      System.out.println(in.toString(CharsetUtil.UTF_8));
      //这里调用service服务
      baseService.test();
    } finally {
      ReferenceCountUtil.release(msg);
    }
  }
  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    // 出现异常就关闭
    cause.printStackTrace();
    ctx.close();
  }
}

public interface BaseService {
  /**
   * 测试接口
   */
  void test();
}

@Service
public class BaseServiceImpl implements BaseService {
  @Override
  public void test() {
    System.out.println("调用service服务");
  }
}

@SpringBootApplication
public class DemoApplication implements CommandLineRunner {
  @Resource
  private DiscardServer discardServer;

  public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
  }

  @Override
  public void run(String... args) throws Exception {
    discardServer.run(8080);
  }
}

public static void main(String[] args){
    try {
      Socket socket=new Socket("localhost",8080);
      OutputStream outputStream = socket.getOutputStream();
      PrintWriter printWriter=new PrintWriter(outputStream);
      printWriter.write("$tmb00035ET3318/08/22 11:5804029.94,027.25,20.00,20.00$");
      printWriter.flush();
      socket.shutdownOutput();
      socket.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

传输内容是
$tmb00035ET3318/08/22 11:5804029.94,027.25,20.00,20.00$
aaaaa