spring boot和netty整合_springboot 整合natty

学习了netty的所有技术，现将netty和spring boot进行整合

导入jar包

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--netty 依赖包-->
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.34.Final</version>
        </dependency>
    </dependencies>
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1.在spring boot的启动类实现CommandLineRunner，并重写其run方法

@SpringBootApplication
public class BootNettyApplication implements CommandLineRunner {

    @Autowired
    private NettyServer nettyServer;
    @Value("${netty.port}")
    private Integer port;
    public static void main(String[] args) {
        SpringApplication.run(BootNettyApplication.class, args);
    }

    /**
     * 此处启动netty服务
     * @param args
     * @throws Exception
     */
    @Override
    public void run(String... args) throws Exception {
        InetSocketAddress address = new InetSocketAddress(port);
        // 启动netty服务器
        ChannelFuture channelFuture = nettyServer.startServer(address);

        // 钩子方法，关闭服务器
        Runtime.getRuntime().addShutdownHook(new Thread(() ->
            nettyServer.closeServer()
        ));
        channelFuture.channel().closeFuture().sync();
    }
}

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2.自定义netty服务类

@Component
@Slf4j
public class NettyServer {
    private final EventLoopGroup bossGroup = new NioEventLoopGroup();
    private final EventLoopGroup workerGroup = new NioEventLoopGroup();
    private Channel channel;

    public ChannelFuture startServer(InetSocketAddress address) {
        ChannelFuture channelFuture = null;
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ServerInit())
                    // 允许的最大连接数
                    .option(ChannelOption.SO_BACKLOG,128)
                    .childOption(ChannelOption.SO_KEEPALIVE,Boolean.TRUE);
            channelFuture = serverBootstrap.bind(address).sync();
            channel = channelFuture.channel();
        } catch (Exception e) {
            log.error("netty启动出错！",e);
        } finally {
            if (channelFuture != null && channelFuture.isSuccess()) {
                log.info("netty正在监听" + address.getHostName() + " 于端口 " + address.getPort() + ", 等待连接");
            } else {
                log.error("netty启动失败！");
            }
        }
        return channelFuture;
    }

    /**
     * 关闭netty服务
     */
    public void closeServer() {
        log.info("关闭netty服务。。。");
        if (channel != null) {
            channel.close();
        }
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
        log.info("关闭netty服务成功！");
    }
}
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3.netty服务初始化

public class ServerInit extends ChannelInitializer<SocketChannel> {

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new StringDecoder(Charset.forName("utf-8")));
        pipeline.addLast(new StringEncoder(Charset.forName("utf-8")));
        // 心跳监测机制
//        pipeline.addLast(new IdleStateHandler(5,7,10, TimeUnit.SECONDS));
        pipeline.addLast(new ServerHandler());
    }
}
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4.自定义handler实现

@Slf4j
public class ServerHandler extends SimpleChannelInboundHandler<String> {

    /**
     * 接收到消息执行的回调方法
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        System.out.println(msg);
    }

    /**
     * 心跳监测
     * @param ctx
     * @param evt
     * @throws Exception
     */
    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt instanceof IdleStateEvent) {
            IdleStateEvent event = (IdleStateEvent) evt;
            String eventType = null;
            switch (event.state()) {
                case READER_IDLE:
                    eventType = "读空闲";
                    break;
                case WRITER_IDLE:
                    eventType = "些空闲";
                    break;
                case ALL_IDLE:
                    eventType = "读写空闲";
                    break;
                default:
            }
            String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
            log.info(date + " " + ctx.channel().remoteAddress() + " " + eventType);
        }
    }

    /**
     * 客户端连接成功执行方法
     * @param ctx
     * @throws Exception
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        log.info(date + " " + ctx.channel().remoteAddress() + " 客户端连接成功！");
        ctx.writeAndFlush("连接成功！");
    }

    /**
     * 客户端下线
     * @param ctx
     * @throws Exception
     */
    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        log.info(date + " " + ctx.channel().remoteAddress() + " 客户端下线！");
    }

    /**
     * 客户端连接成功后执行的回调方法
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        log.info(date + " " + ctx.channel().remoteAddress() + " 新的客户端加入！");
    }

    /**
     * 断开连接
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        log.info(date + " " + ctx.channel().remoteAddress() + " 客户端断开连接！");
    }

    /**
     * 抛出异常
     * @param ctx
     * @param cause
     * @throws Exception
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        log.error("netty 服务出错！",cause);
        ctx.close();
    }

}
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正常启动spring boot即可进行netty通信，可以自定义一个netty的client进行测试：

public class MyClient {
    public static void main(String[] args) {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            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 LengthFieldBasedFrameDecoder(Integer.MAX_VALUE,0,4,0,4));
//                    pipeline.addLast(new LengthFieldPrepender(4));
                    pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
                    pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));
                    pipeline.addLast(new SimpleChannelInboundHandler<String>() {
                        @Override
                        protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
                            System.out.println(ctx.channel().remoteAddress());
                            System.out.println("client msg:" + msg);
                            ctx.writeAndFlush("from client:" + LocalDateTime.now());
                        }

                        @Override
                        public void channelActive(ChannelHandlerContext ctx) throws Exception {
                            ctx.writeAndFlush("客户端进行了链接！");
                        }

                        @Override
                        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                            cause.printStackTrace();
                            ctx.close();
                        }
                    });
                }
            });
            ChannelFuture channelFuture = bootstrap.connect("localhost", 8888).sync();
            channelFuture.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            group.shutdownGracefully();
        }
    }
}
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good luck！