Netty搭建WebSocket服务端 - 青衫仗剑 - 博客园
目录
Netty服务端
1.引入依赖
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version> <!-- 我这里用的1.5.9 -->
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.blaze</groupId>
<artifactId>netty-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>netty-demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.50</version>
</dependency>
<!--netty依赖-->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.43.Final</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.blaze.nettydemo.server.WebSocketServer</mainClass>
</configuration>
</plugin>
</plugins>
<finalName>netty-server</finalName>
</build>
</project>
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2.服务端
WebSocketServer
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import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.Channel; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.handler.logging.LogLevel; import io.netty.handler.logging.LoggingHandler; import io.netty.handler.ssl.SslContext; import io.netty.handler.ssl.SslContextBuilder; import io.netty.handler.ssl.util.SelfSignedCertificate; /** * create by zy 2019/11/28 14:50
* TODO */
public final class WebSocketServer { //static final boolean SSL = System.getProperty("ssl") != null; //static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "8443" : "8888"));
static final boolean SSL = false; static final int PORT = 8888; public static void main(String\[\] args) throws Exception { // Configure SSL. 配置 SSL
final SslContext sslCtx; if (SSL) {
SelfSignedCertificate ssc = new SelfSignedCertificate();
sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
} else {
sslCtx = null;
} /** \* interface EventLoopGroup extends EventExecutorGroup extends ScheduledExecutorService extends ExecutorService
\* 配置服务端的 NIO 线程池,用于网络事件处理，实质上他们就是 Reactor 线程组
\* bossGroup 用于服务端接受客户端连接，workerGroup 用于进行 SocketChannel 网络读写 */ EventLoopGroup bossGroup = new NioEventLoopGroup(1);
EventLoopGroup workerGroup = new NioEventLoopGroup(); try { // ServerBootstrap 是 Netty 用于启动 NIO 服务端的辅助启动类，用于降低开发难度
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new WebSocketServerInitializer(sslCtx)); //服务器启动辅助类配置完成后，调用 bind 方法绑定监听端口，调用 sync 方法同步等待绑定操作完成，服务开启
Channel ch = b.bind(PORT).sync().channel();
System.out.println("服务已开启,等待客户端连接......"); //下面会进行阻塞，等待服务器连接关闭之后 main 方法退出，程序结束ch.closeFuture().sync();
} catch (InterruptedException e) {
e.printStackTrace();
} finally { //退出 释放资源bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}}
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WebSocketServerInitializer
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import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelPipeline; import io.netty.channel.socket.SocketChannel; import io.netty.handler.codec.http.HttpObjectAggregator; import io.netty.handler.codec.http.HttpServerCodec; import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler; import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketServerCompressionHandler; import io.netty.handler.ssl.SslContext; /** * create by zy 2019/11/28 14:53
* TODO */
public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel> { private static final String WEBSOCKET_PATH = "/"; private final SslContext sslCtx; public WebSocketServerInitializer(SslContext sslCtx) { this.sslCtx = sslCtx;
}
@Override public void initChannel(SocketChannel ch) {
ChannelPipeline pipeline = ch.pipeline(); if (sslCtx != null) {
pipeline.addLast(sslCtx.newHandler(ch.alloc())); // 设置 https 相关}
pipeline.addLast(new HttpServerCodec()); // http 编码
pipeline.addLast(new HttpObjectAggregator(65536)); // http 消息聚合器
pipeline.addLast(new WebSocketServerCompressionHandler()); // 压缩 可以不设置
pipeline.addLast(new WebSocketServerProtocolHandler(WEBSOCKET_PATH, null, true)); // 协议
pipeline.addLast(new WebSocketFrameHandler()); // 处理WebSocketFrame}
}
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WebSocketFrameHandler
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import com.alibaba.fastjson.JSON; import com.rising.netty.model.RequestModel; import com.rising.netty.model.ResultModel; import com.rising.netty.util.MQUtil; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame; import io.netty.handler.codec.http.websocketx.TextWebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketFrame; /** * create by zy 2019/11/28 14:57
* TODO */
public class WebSocketFrameHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
@Override protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception { if (frame instanceof TextWebSocketFrame) {
String request = ((TextWebSocketFrame) frame).text();
System.out.println("接收消息:" + request);
String msg = "接收成功"; //返回信息
ctx.channel().writeAndFlush(new TextWebSocketFrame(msg));
} else if (frame instanceof BinaryWebSocketFrame) { //二进制
ByteBuf content = frame.content(); byte\[\] reg = new byte\[content.readableBytes()\];
content.readBytes(reg);
String request = new String(reg, "UTF-8");
System.out.println("接收消息:" + request);
String msg = "接收成功"; //返回信息
ByteBuf respByteBuf = Unpooled.copiedBuffer(msg.getBytes());
ctx.channel().writeAndFlush(new BinaryWebSocketFrame(respByteBuf));
} else {
String message = "unsupported frame type: " + frame.getClass().getName(); throw new UnsupportedOperationException(message);
}
}}
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3.客户端
WebSocketClient
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import io.netty.bootstrap.Bootstrap; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; 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.NioSocketChannel; import io.netty.handler.codec.http.DefaultHttpHeaders; import io.netty.handler.codec.http.HttpClientCodec; import io.netty.handler.codec.http.HttpObjectAggregator; import io.netty.handler.codec.http.websocketx.; import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler; import io.netty.handler.ssl.SslContext; import io.netty.handler.ssl.SslContextBuilder; import io.netty.handler.ssl.util.InsecureTrustManagerFactory; import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URI; /* * create by zy 2019/11/28 14:57
* TODO */
public final class WebSocketClient { static final String URL = System.getProperty("url", "ws://127.0.0.1:8888/"); public static void main(String[] args) throws Exception {
URI uri = new URI(URL);
String scheme = uri.getScheme() == null ? "ws" : uri.getScheme(); final String host = uri.getHost() == null ? "127.0.0.1" : uri.getHost(); final int port; if (uri.getPort() == -1) { if ("ws".equalsIgnoreCase(scheme)) {
port = 80;
} else if ("wss".equalsIgnoreCase(scheme)) {
port = 443;
} else {
port = -1;
}
} else {
port = uri.getPort();
} if (!"ws".equalsIgnoreCase(scheme) && !"wss".equalsIgnoreCase(scheme)) {
System.err.println("Only WS(S) is supported."); return;
} final boolean ssl = "wss".equalsIgnoreCase(scheme); final SslContext sslCtx; if (ssl) {
sslCtx = SslContextBuilder.forClient()
.trustManager(InsecureTrustManagerFactory.INSTANCE).build();
} else {
sslCtx = null;
} //配置客户端 NIO 线程组/池
EventLoopGroup group = new NioEventLoopGroup(); try { // Connect with V13 (RFC 6455 aka HyBi-17). You can change it to V08 or V00. // If you change it to V00, ping is not supported and remember to change // HttpResponseDecoder to WebSocketHttpResponseDecoder in the pipeline.
final WebSocketClientHandler handler = new WebSocketClientHandler(
WebSocketClientHandshakerFactory.newHandshaker(
uri, WebSocketVersion.V13, null, true, new DefaultHttpHeaders())); /** \* Bootstrap 与 ServerBootstrap 都继承(extends)于 AbstractBootstrap
\* 创建客户端辅助启动类,并对其配置,与服务器稍微不同，这里的 Channel 设置为 NioSocketChannel
\* 然后为其添加 Handler，这里直接使用匿名内部类，实现 initChannel 方法
\* 作用是当创建 NioSocketChannel 成功后，在进行初始化时,将它的ChannelHandler设置到ChannelPipeline中，用于处理网络I/O事件 */ Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInitializer<SocketChannel>() {
@Override protected void initChannel(SocketChannel ch) {
ChannelPipeline p = ch.pipeline(); if (sslCtx != null) {
p.addLast(sslCtx.newHandler(ch.alloc(), host, port));
}
p.addLast( new HttpClientCodec(), new HttpObjectAggregator(8192),
WebSocketClientCompressionHandler.INSTANCE,
handler);
}
}); //客户端与服务端建立连接
Channel ch = b.connect(uri.getHost(), port).sync().channel();
handler.handshakeFuture().sync(); /** \* 将输入信息传输到 server 端 */ BufferedReader console = new BufferedReader(new InputStreamReader(System.in)); while (true) {
String msg = console.readLine(); if (msg == null) { break;
} else if ("bye".equals(msg.toLowerCase())) { //输入bye 断开连接
ch.writeAndFlush(new CloseWebSocketFrame());
ch.closeFuture().sync(); break;
} else if ("ping".equals(msg.toLowerCase())) {
WebSocketFrame frame = new PingWebSocketFrame(Unpooled.wrappedBuffer(new byte\[\]{8, 1, 8, 1}));
ch.writeAndFlush(frame);
} else {
WebSocketFrame frame = new TextWebSocketFrame(msg);
ch.writeAndFlush(frame);
}
}
} finally {
group.shutdownGracefully();
}
}}
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WebSocketClientHandler
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import io.netty.channel.; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.websocketx.; import io.netty.util.CharsetUtil; /** * create by zy 2019/11/28 14:58
* TODO */
public class WebSocketClientHandler extends SimpleChannelInboundHandler<Object> { private final WebSocketClientHandshaker handshaker; private ChannelPromise handshakeFuture; public WebSocketClientHandler(WebSocketClientHandshaker handshaker) { this.handshaker = handshaker;
} public ChannelFuture handshakeFuture() { return handshakeFuture;
}
@Override public void handlerAdded(ChannelHandlerContext ctx) {
handshakeFuture = ctx.newPromise();
}
@Override public void channelActive(ChannelHandlerContext ctx) {
handshaker.handshake(ctx.channel());
}
@Override public void channelInactive(ChannelHandlerContext ctx) {
System.out.println("WebSocket Client disconnected!");
}
@Override public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
Channel ch = ctx.channel(); if (!handshaker.isHandshakeComplete()) { try { //握手成功 建立连接handshaker.finishHandshake(ch, (FullHttpResponse) msg);
System.out.println("WebSocket Client connected!");
handshakeFuture.setSuccess();
} catch (WebSocketHandshakeException e) { //握手失败
System.out.println("WebSocket Client failed to connect");
handshakeFuture.setFailure(e);
} return;
} if (msg instanceof FullHttpResponse) {
FullHttpResponse response = (FullHttpResponse) msg; throw new IllegalStateException( "Unexpected FullHttpResponse (getStatus=" + response.status() +
", content=" + response.content().toString(CharsetUtil.UTF_8) + ')');
}
WebSocketFrame frame = (WebSocketFrame) msg; if (frame instanceof TextWebSocketFrame) { //接收客户端返回消息
TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
System.out.println("WebSocket Client received message: " + textFrame.text());
} else if (frame instanceof PongWebSocketFrame) {
System.out.println("WebSocket Client received pong");
} else if (frame instanceof CloseWebSocketFrame) {
System.out.println("WebSocket Client received closing");
ch.close();
}
}
@Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace(); if (!handshakeFuture.isDone()) {
handshakeFuture.setFailure(cause);
}
ctx.close();
}}
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4.web客户端
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Netty-Websocket</title>
<script type="text/javascript">
var socket; if(!window.WebSocket){
window.WebSocket = window.MozWebSocket;
} if(window.WebSocket){
socket = new WebSocket("ws://127.0.0.1:9898/");
socket.onmessage = function(event){ var ta = document.getElementById('responseText');
ta.value += event.data+"\\r\\n";
};
socket.onopen = function(event){ var ta = document.getElementById('responseText');
ta.value = "Netty-WebSocket服务器。。。。。。连接 \\r\\n";
login();
};
socket.onclose = function(event){ var ta = document.getElementById('responseText');
ta.value = "Netty-WebSocket服务器。。。。。。关闭 \\r\\n";
};
}else{
alert("您的浏览器不支持WebSocket协议！");
} function send(msg){ if(!window.WebSocket){return;} if(socket.readyState == WebSocket.OPEN){
socket.send(msg);
}else{
alert("WebSocket 连接没有建立成功！");
}
} function login(){ if(!window.WebSocket){return;} if(socket.readyState == WebSocket.OPEN){
socket.send("建立连接成功!");
}else{
alert("WebSocket 连接没有建立成功！");
}
} function closeSocket(){ if(!window.WebSocket){return;}
socket.close();
} </script></head>
<body>
<form onSubmit="return false;">
<label>TEXT</label><input type="text" name="blaze" value="" /> <br />
<br /> <input type="button" value="发送ws消息" onClick="send(this.form.blaze.value)" />
<hr color="black" />
<br /> <input type="button" value="断开连接" onClick="closeSocket()" />
<hr color="black" />
<h3>服务端返回的应答消息</h3>
<textarea id="responseText" style="width: 1024px;height: 300px;"></textarea></form>
</body>
</html>
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原网址: 访问
创建于: 2023-09-20 14:30:35
目录: default
标签: 无
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