1.Netty服务端

服务端代码参考【基于Netty实现安全认证的WebSocket（wss）服务端-CSDN博客】

2.Netty客户端

客户端代码参考【基于Netty实现WebSocket客户端-CSDN博客】中两种都可以；这里用的是第一种。

新增SslHandler的代码：

SslContext sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
...
pipeline.addLast(sslCtx.newHandler(sc.alloc(), webSocketURL.getHost(), webSocketURL.getPort()));

服务端地址的协议头调整为wss

final URI webSocketURL = new URI("wss://127.0.0.1:7070/helloWs");

完整的客户端代码如下：

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.SimpleChannelInboundHandler;
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.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
import io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler;
import io.netty.handler.codec.http.websocketx.WebSocketVersion;
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.InsecureTrustManagerFactory;
import io.netty.handler.stream.ChunkedWriteHandler;
import lombok.extern.slf4j.Slf4j;import java.net.URI;
import java.util.concurrent.CountDownLatch;/*** https://blog.csdn.net/a1053765496/article/details/130701218* 基于Netty快速实现WebSocket客户端，不手动处理握手*/
@Slf4j
public class SimpleWssClient {final CountDownLatch latch = new CountDownLatch(1);public static void main(String[] args) throws Exception {SimpleWssClient client = new SimpleWssClient();client.test();}public void test() throws Exception {Channel dest = dest();latch.await();dest.writeAndFlush(new TextWebSocketFrame("CountDownLatch完成后发送的消息"));}public Channel dest() throws Exception {final URI webSocketURL = new URI("wss://127.0.0.1:7070/helloWs");EventLoopGroup group = new NioEventLoopGroup();SslContext sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();Bootstrap boot = new Bootstrap();boot.option(ChannelOption.SO_KEEPALIVE, true).option(ChannelOption.TCP_NODELAY, true).group(group).handler(new LoggingHandler(LogLevel.INFO)).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {@Overrideprotected void initChannel(SocketChannel sc) throws Exception {ChannelPipeline pipeline = sc.pipeline();pipeline.addLast(sslCtx.newHandler(sc.alloc(), webSocketURL.getHost(), webSocketURL.getPort()));pipeline.addLast(new HttpClientCodec());pipeline.addLast(new ChunkedWriteHandler());pipeline.addLast(new HttpObjectAggregator(64 * 1024));pipeline.addLast(new WebSocketClientProtocolHandler(WebSocketClientHandshakerFactory.newHandshaker(webSocketURL, WebSocketVersion.V13, null, false, new DefaultHttpHeaders())));pipeline.addLast(new SimpleChannelInboundHandler<TextWebSocketFrame>() {@Overrideprotected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg)throws Exception {System.err.println(" 客户端收到消息======== " + msg.text());}@Overridepublic void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {if (WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_COMPLETE.equals(evt)) {log.info(ctx.channel().id().asShortText() + " 握手完成！");latch.countDown();send(ctx.channel());}super.userEventTriggered(ctx, evt);}});}});ChannelFuture cf = boot.connect(webSocketURL.getHost(), webSocketURL.getPort()).sync();return cf.channel();}public static void send(Channel channel) {final String textMsg = "握手完成后直接发送的消息";if (channel != null && channel.isActive()) {TextWebSocketFrame frame = new TextWebSocketFrame(textMsg);channel.writeAndFlush(frame).addListener((ChannelFutureListener) channelFuture -> {if (channelFuture.isDone() && channelFuture.isSuccess()) {log.info("     ================= 发送成功.");} else {channelFuture.channel().close();log.info("     ================= 发送失败. cause = " + channelFuture.cause());channelFuture.cause().printStackTrace();}});} else {log.error("消息发送失败！ textMsg = " + textMsg);}}}

参考：利用netty开发webScoketClient（支持wss协议，客户端、服务端心跳实现）_websocketclient-CSDN博客