springboot整合netty的步骤

springboot整合netty框架

　Netty 是一个基于NIO的客户、服务器端编程框架，使用Netty 可以确保你快速和简单的开发出一个网络应用，例如实现了某种协议的客户、服务端应用。Netty相当于简化和流线化了网络应用的编程开发过程，例如：基于TCP和UDP的socket服务开发。

那么如何和springboot这个比较流行的框架进行整合呢？Netty与SpringBoot的整合，我想无非就是要整合几个地方

让netty跟springboot生命周期保持一致，同生共死
让netty能用上ioc中的Bean
让netty能读取到全局的配置

首先整个项目引入pom

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

是的，不用声明版本号。因为 spring-boot-dependencies 中已经声明了最新的netty依赖。

配置Netty的配置类

一、通过yaml配置基本的属性

server:
  port: 80

logging:
    level:
      root: DEBUG

management:
  endpoints: 
    web:
      exposure:
        include: "*"
    
  endpoint:
    shutdown:
      enabled: true

netty:
  websocket:
    # Websocket服务端口
    port: 1024
    # 绑定的网卡
    ip: 0.0.0.0
    # 消息帧最大体积
    max-frame-size: 10240
    # URI路径
    path: /channel

通过 ApplicationRunner 启动Websocket服务

二、在Controller里新建NettyBootsrapRunner 类

import java.net.InetSocketAddress;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.stereotype.Component;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketServerCompressionHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.springboot.netty.websocket.handler.WebsocketMessageHandler;

/**
 * 初始化Netty服务
 * @author Administrator
 */
@Component
public class NettyBootsrapRunner implements ApplicationRunner, ApplicationListener<ContextClosedEvent>, ApplicationContextAware {

	private static final Logger LOGGER = LoggerFactory.getLogger(NettyBootsrapRunner.class);
	
	@Value("${netty.websocket.port}")
	private int port;

	@Value("${netty.websocket.ip}")
	private String ip;
	
	@Value("${netty.websocket.path}")
	private String path;
	
	@Value("${netty.websocket.max-frame-size}")
	private long maxFrameSize;
	
	private ApplicationContext applicationContext;
	
	private Channel serverChannel;
	
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		this.applicationContext = applicationContext;
	}
	
	public void run(ApplicationArguments args) throws Exception {
		
		EventLoopGroup bossGroup = new NioEventLoopGroup();
		EventLoopGroup workerGroup = new NioEventLoopGroup();
		try {
			ServerBootstrap serverBootstrap = new ServerBootstrap();
			serverBootstrap.group(bossGroup, workerGroup);
			serverBootstrap.channel(NioServerSocketChannel.class);
			serverBootstrap.localAddress(new InetSocketAddress(this.ip, this.port));
			serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
				@Override
				protected void initChannel(SocketChannel socketChannel) throws Exception {
					ChannelPipeline pipeline = socketChannel.pipeline();
					pipeline.addLast(new HttpServerCodec());
					pipeline.addLast(new ChunkedWriteHandler());
					pipeline.addLast(new HttpObjectAggregator(65536));
					pipeline.addLast(new ChannelInboundHandlerAdapter() {
						@Override
						public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
							if(msg instanceof FullHttpRequest) {
								FullHttpRequest fullHttpRequest = (FullHttpRequest) msg;
								String uri = fullHttpRequest.uri();
								if (!uri.equals(path)) {
									// 访问的路径不是 websocket的端点地址，响应404
									ctx.channel().writeAndFlush(new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.NOT_FOUND))
										.addListener(ChannelFutureListener.CLOSE);
									return ;
								}
							}
							super.channelRead(ctx, msg);
						}
					});
					pipeline.addLast(new WebSocketServerCompressionHandler());
					pipeline.addLast(new WebSocketServerProtocolHandler(path, null, true, maxFrameSize));

					/**
					 * 从IOC中获取到Handler
					 */
					pipeline.addLast(applicationContext.getBean(WebsocketMessageHandler.class));
				}
			});
			Channel channel = serverBootstrap.bind().sync().channel();	
			this.serverChannel = channel;
			LOGGER.info("websocket 服务启动，ip={},port={}", this.ip, this.port);
			channel.closeFuture().sync();
		} finally {
			bossGroup.shutdownGracefully();
			workerGroup.shutdownGracefully();
		}
	}

	public void onApplicationEvent(ContextClosedEvent event) {
		if (this.serverChannel != null) {
			this.serverChannel.close();
		}
		LOGGER.info("websocket 服务停止");
	}
}

NettyBootsrapRunner 实现了 ApplicationRunner, ApplicationListener, ApplicationContextAware 接口。

这样一来，NettyBootsrapRunner 可以在App的启动和关闭时执行Websocket服务的启动和关闭。而且通过 ApplicationContextAware 还能获取到 ApplicationContext

1.通过IOC管理 Netty 的Handler

WebsocketMessageHandler

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketCloseStatus;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.springboot.netty.service.DiscardService;
/**
 * 
 * @author Administrator
 *
 */
@Sharable
@Component
public class WebsocketMessageHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
	
	private static final Logger LOGGER = LoggerFactory.getLogger(WebsocketMessageHandler.class);
	
	@Autowired
	DiscardService discardService;
	
	@Override
	protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame msg) throws Exception {
		if (msg instanceof TextWebSocketFrame) {
			TextWebSocketFrame textWebSocketFrame = (TextWebSocketFrame) msg;
			// 业务层处理数据
			this.discardService.discard(textWebSocketFrame.text());
			// 响应客户端
			ctx.channel().writeAndFlush(new TextWebSocketFrame("我收到了你的消息：" + System.currentTimeMillis()));
		} else {
			// 不接受文本以外的数据帧类型
			ctx.channel().writeAndFlush(WebSocketCloseStatus.INVALID_MESSAGE_TYPE).addListener(ChannelFutureListener.CLOSE);
		}
	}
	
	@Override
	public void channelInactive(ChannelHandlerContext ctx) throws Exception {
		super.channelInactive(ctx);
		LOGGER.info("链接断开：{}", ctx.channel().remoteAddress());
	}
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		super.channelActive(ctx);
		LOGGER.info("链接创建：{}", ctx.channel().remoteAddress());
	}
}

handler已经是一个IOC管理的Bean，可以自由的使用依赖注入等Spring带来的快捷功能。由于是单例存在，所有的链接都使用同一个hander，所以尽量不要保存任何实例变量。

这个Handler处理完毕客户端的消息后，给客户端会响应一条：“我收到了你的消息：” + System.currentTimeMillis() 的消息

为了演示在Handler中使用业务层，这里假装注入了一个 DiscardService 服务。它的逻辑很简单，就是丢弃消息

2.DiscardService 服务

代码如下（示例）：

public void discard (String message) {
	LOGGER.info("丢弃消息:{}", message);
}

演示

启动客户端

<!DOCTYPE html>
	<html>
	<head>
		<meta charset="UTF-8">
		<title>Websocket</title>
	</head>
	<body>
	
	</body>
	<script type="text/javascript">
		;(function(){
			const websocket = new WebSocket('ws://localhost:1024/channel');
			websocket.onmessage = e => {
				console.log('收到消息:', e.data);
			}
			websocket.onclose = e => {
				let {code, reason} = e;
				console.log(`链接断开:code=${code}, reason=${reason}`);
			}
			websocket.onopen = () => {
				console.log(`链接建立...`);
				websocket.send('Hello');
			}
			websocket.onerror = e => {
				console.log('链接异常:', e);
			}
		})();

	</script>
</html>

链接创建后就给服务端发送一条消息：Hello。Netty会在SpringBoot App启动后启动，App停止后关闭，可以正常的对外提供服务 并且Handler交给IOC管理可以注入Service，完成业务处理。