netty之Netty与SpringBoot整合

在实际的开发中，我们需要对netty服务进行更多的操作，包括；获取它的状态信息、启动/停止、对客户端用户强制下线等等，为此我们需要把netty服务加入到web系统中。
MyChannelInitializer

public class MyChannelInitializer extends ChannelInitializer<SocketChannel> {@Overrideprotected void initChannel(SocketChannel channel) {// 基于换行符号channel.pipeline().addLast(new LineBasedFrameDecoder(1024));// 解码转String，注意调整自己的编码格式GBK、UTF-8channel.pipeline().addLast(new StringDecoder(Charset.forName("GBK")));// 解码转String，注意调整自己的编码格式GBK、UTF-8channel.pipeline().addLast(new StringEncoder(Charset.forName("GBK")));// 在管道中添加我们自己的接收数据实现方法channel.pipeline().addLast(new MyServerHandler());}}

MyServerHandler

public class MyServerHandler extends ChannelInboundHandlerAdapter {private Logger logger = LoggerFactory.getLogger(MyServerHandler.class);/*** 当客户端主动链接服务端的链接后，这个通道就是活跃的了。也就是客户端与服务端建立了通信通道并且可以传输数据*/@Overridepublic void channelActive(ChannelHandlerContext ctx) throws Exception {SocketChannel channel = (SocketChannel) ctx.channel();logger.info("链接报告开始");logger.info("链接报告信息：有一客户端链接到本服务端");logger.info("链接报告IP:{}", channel.localAddress().getHostString());logger.info("链接报告Port:{}", channel.localAddress().getPort());logger.info("链接报告完毕");//通知客户端链接建立成功String str = "通知客户端链接建立成功" + " " + new Date() + " " + channel.localAddress().getHostString() + "\r\n";ctx.writeAndFlush(str);}/*** 当客户端主动断开服务端的链接后，这个通道就是不活跃的。也就是说客户端与服务端的关闭了通信通道并且不可以传输数据*/@Overridepublic void channelInactive(ChannelHandlerContext ctx) throws Exception {logger.info("客户端断开链接{}", ctx.channel().localAddress().toString());}@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {//接收msg消息{与上一章节相比，此处已经不需要自己进行解码}logger.info(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " 服务端接收到消息：" + msg);//通知客户端链消息发送成功String str = "服务端收到：" + new Date() + " " + msg + "\r\n";ctx.writeAndFlush(str);}/*** 抓住异常，当发生异常的时候，可以做一些相应的处理，比如打印日志、关闭链接*/@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {ctx.close();logger.info("异常信息：\r\n" + cause.getMessage());}}

@Component("nettyServer")
public class NettyServer {private Logger logger = LoggerFactory.getLogger(NettyServer.class);//配置服务端NIO线程组private final EventLoopGroup parentGroup = new NioEventLoopGroup(); //NioEventLoopGroup extends MultithreadEventLoopGroup Math.max(1, SystemPropertyUtil.getInt("io.netty.eventLoopThreads", NettyRuntime.availableProcessors() * 2));private final EventLoopGroup childGroup = new NioEventLoopGroup();private Channel channel;public ChannelFuture bing(InetSocketAddress address) {ChannelFuture channelFuture = null;try {ServerBootstrap b = new ServerBootstrap();b.group(parentGroup, childGroup).channel(NioServerSocketChannel.class)    //非阻塞模式.option(ChannelOption.SO_BACKLOG, 128).childHandler(new MyChannelInitializer());channelFuture = b.bind(address).syncUninterruptibly();channel = channelFuture.channel();} catch (Exception e) {logger.error(e.getMessage());} finally {if (null != channelFuture && channelFuture.isSuccess()) {logger.info("server start done. {关注明哥 获取源码}");} else {logger.error("server start error. {关注明哥 获取源码}");}}return channelFuture;}public void destroy() {if (null == channel) return;channel.close();parentGroup.shutdownGracefully();childGroup.shutdownGracefully();}public Channel getChannel() {return channel;}}

@SpringBootApplication
@ComponentScan("com.lm")
public class NettyApplication implements CommandLineRunner {@Value("${netty.host}")private String host;@Value("${netty.port}")private int port;@Autowiredprivate NettyServer nettyServer;public static void main(String[] args) {SpringApplication.run(NettyApplication.class, args);}@Overridepublic void run(String... args) throws Exception {InetSocketAddress address = new InetSocketAddress(host, port);ChannelFuture channelFuture = nettyServer.bing(address);Runtime.getRuntime().addShutdownHook(new Thread(() -> nettyServer.destroy()));channelFuture.channel().closeFuture().syncUninterruptibly();}}

@RestController
@RequestMapping(value = "/nettyserver", method = RequestMethod.GET)
public class NettyController {@Resourceprivate NettyServer nettyServer;@RequestMapping("/localAddress")public String localAddress() {return "nettyServer localAddress " + nettyServer.getChannel().localAddress();}@RequestMapping("/isOpen")public String isOpen() {return "nettyServer isOpen " + nettyServer.getChannel().isOpen();}}

测试结果
启动SpringBoot *NettyApplication.main >run

启动ApiTest

Web访问 *http://localhost:8080/nettyserver/localAddress

Web访问 *http://localhost:8080/nettyserver/isOpen

好了到这里就结束了netty之Netty与SpringBoot整合的学习，大家一定要跟着动手操作起来。需要的源码的 可si我获取；