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在SpringBoot中整合使用Netty框架的详细教程

作者:朱由检

这篇文章主要介绍了在SpringBoot中整合使用Netty框架的教程,本文给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

Netty是一个非常优秀的Socket框架。如果需要在SpringBoot开发的app中,提供Socket服务,那么Netty是不错的选择。

Netty与SpringBoot的整合,我想无非就是要整合几个地方

整合Netty,提供WebSocket服务

这里演示一个案例,在SpringBoot中使用Netty提供一个Websocket服务。

servlet容器本身提供了websocket的实现,但这里用netty的实现 :sparkling_heart:

添加依赖

<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。

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

App使用了, actuator ,并且开启暴露了 shutdown 端点,可以让SpringBoot App优雅的停机。 在这里通过 netty.websocket.* 配置 websocket服务相关的配置。

通过 ApplicationRunner 启动Websocket服务

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<ContextClosedEvent> , 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

通过IOC管理 Netty 的Handler

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

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

关闭服务端

使用 PostMan 请求服务器的停机端点

 

日志

客户端日志

 

服务端日志

2020-06-22 17:08:22.728  INFO 9392 --- [           main] io.undertow                              : starting server: Undertow - 2.1.3.Final
2020-06-22 17:08:22.740  INFO 9392 --- [           main] org.xnio                                 : XNIO version 3.8.0.Final
2020-06-22 17:08:22.752  INFO 9392 --- [           main] org.xnio.nio                             : XNIO NIO Implementation Version 3.8.0.Final
2020-06-22 17:08:22.839  INFO 9392 --- [           main] org.jboss.threads                        : JBoss Threads version 3.1.0.Final
2020-06-22 17:08:22.913  INFO 9392 --- [           main] o.s.b.w.e.undertow.UndertowWebServer     : Undertow started on port(s) 80 (http)
2020-06-22 17:08:22.931  INFO 9392 --- [           main] io.springboot.netty.NettyApplication     : Started NettyApplication in 4.536 seconds (JVM running for 5.175)
2020-06-22 17:08:23.653  INFO 9392 --- [           main] i.s.n.w.runner.NettyBootsrapRunner       : websocket 服务启动,ip=0.0.0.0,port=1024
2020-06-22 17:08:28.484  INFO 9392 --- [  XNIO-1 task-1] io.undertow.servlet                      : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-06-22 17:08:28.484  INFO 9392 --- [  XNIO-1 task-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2020-06-22 17:08:28.492  INFO 9392 --- [  XNIO-1 task-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 8 ms
2020-06-22 17:08:28.724  INFO 9392 --- [ntLoopGroup-3-1] i.s.n.w.handler.WebsocketMessageHandler  : 链接创建:/0:0:0:0:0:0:0:1:12093
2020-06-22 17:08:28.790  INFO 9392 --- [ntLoopGroup-3-1] i.s.netty.service.DiscardService         : 丢弃消息:Hello
2020-06-22 17:08:33.688  INFO 9392 --- [     Thread-232] i.s.n.w.runner.NettyBootsrapRunner       : websocket 服务停止
2020-06-22 17:08:33.691  INFO 9392 --- [ntLoopGroup-3-1] i.s.n.w.handler.WebsocketMessageHandler  : 链接断开:/0:0:0:0:0:0:0:1:12093
2020-06-22 17:08:33.699  INFO 9392 --- [     Thread-232] io.undertow                              : stopping server: Undertow - 2.1.3.Final
2020-06-22 17:08:33.704  INFO 9392 --- [     Thread-232] io.undertow.servlet                      : Destroying Spring FrameworkServlet 'dispatcherServlet'
2020-06-22 17:08:33.708  INFO 9392 --- [     Thread-232] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'

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。

总结

到此这篇关于在SpringBoot中整合使用Netty框架的文章就介绍到这了,更多相关SpringBoot整合Netty框架内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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