在SpringBoot中整合使用Netty框架的详细教程

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

• 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

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。

来源：https://juejin.im/post/5ef0786151882565b0119b00