java netty wss_netty实现websocket客户端（支持wss安全连接）

好的，我可以为您提供一些关于使用Netty实现WebSocket客户端（支持wss安全连接）的建议。

首先，您需要确保已经包含了Netty和WebSocket依赖项。然后可以按照以下步骤实现：

1. 创建一个WebSocketClientHandshaker，用于握手和建立WebSocket连接。这里我们需要使用wss连接，因此需要使用WebSocketClientHandshakerFactory创建一个以SSL/TLS方式连接的WebSocket连接。

2. 创建一个WebSocketClientHandler，处理WebSocket连接的事件。这里我们需要重写channelActive、channelInactive和channelRead0等方法，以便在连接建立、关闭和接收到消息时执行相应的操作。

3. 创建一个Bootstrap实例，用于启动客户端。设置bootstrap的group、channel、handler等属性。

4. 连接到WebSocket服务器。通过bootstrap的connect方法连接到指定的WebSocket服务器。

下面是一个简单的示例代码：

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
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.nio.NioSocketChannel;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpRequestEncoder;
import io.netty.handler.codec.http.HttpResponseDecoder;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.SslHandler;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrameAggregator;
import io.netty.handler.codec.http.websocketx.WebSocketVersion;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientProtocolHandler;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

import java.net.URI;
import java.util.concurrent.TimeUnit;

public class NettyWebSocketClient {
    private final URI uri;
    private final EventLoopGroup group;
    private Channel channel;

    public NettyWebSocketClient(URI uri) {
        this.uri = uri;
        this.group = new NioEventLoopGroup();
    }

    public void connect() throws Exception {
        try {
            SslContext sslContext = SslContextBuilder.forClient()
                .trustManager(InsecureTrustManagerFactory.INSTANCE).build();

            WebSocketClientHandshaker handshaker = WebSocketClientHandshakerFactory.newHandshaker(
                uri, WebSocketVersion.V13, null, true, null);

            Bootstrap bootstrap = new Bootstrap()
                .group(group)
                .channel(NioSocketChannel.class)
                .handler(new ChannelInitializer<Channel>() {
                    @Override
                    protected void initChannel(Channel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();

                        pipeline.addLast(new LoggingHandler(LogLevel.DEBUG));

                        pipeline.addLast(new HttpClientCodec());
                        pipeline.addLast(new HttpObjectAggregator(65536));
                        pipeline.addLast(new HttpRequestEncoder());
                        pipeline.addLast(new HttpResponseDecoder());

                        pipeline.addLast(new SslHandler(sslContext.newEngine(ch.alloc(), uri.getHost(), uri.getPort())));

                        pipeline.addLast(new WebSocketClientProtocolHandler(handshaker));

                        pipeline.addLast(new WebSocketFrameAggregator(65536));

                        pipeline.addLast(new WebSocketClientHandler());
                    }
                });

            channel = bootstrap.connect(uri.getHost(), uri.getPort()).sync().channel();
            handshaker.handshake(channel).sync();

        } catch (Exception e) {
            group.shutdownGracefully();
            throw e;
        }
    }

    public void sendMessage(WebSocketFrame frame) {
        channel.writeAndFlush(frame);
    }

    public void close() {
        channel.writeAndFlush(new CloseWebSocketFrame())
            .addListener(ChannelFutureListener.CLOSE);
        group.shutdownGracefully();
    }

    private class WebSocketClientHandler extends io.netty.channel.SimpleChannelInboundHandler<Object> {
        @Override
        protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
            if (msg instanceof FullHttpResponse) {
                FullHttpResponse response = (FullHttpResponse) msg;
                throw new IllegalStateException("Unexpected response (status=" + response.status() +
                    ", content=" + response.content().toString() + ")");
            }

            WebSocketFrame frame = (WebSocketFrame) msg;
            if (frame instanceof TextWebSocketFrame) {
                TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
                // 处理文本消息
                System.out.println("Received Text Message: " + textFrame.text());
            } else if (frame instanceof BinaryWebSocketFrame) {
                BinaryWebSocketFrame binaryFrame = (BinaryWebSocketFrame) frame;
                // 处理二进制消息
            } else if (frame instanceof PingWebSocketFrame) {
                ctx.writeAndFlush(new PingWebSocketFrame(frame.content().retain()));
            } else if (frame instanceof CloseWebSocketFrame) {
                channel.close();
            }
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            cause.printStackTrace();
            ctx.close();
        }

        @Override
        public void channelInactive(ChannelHandlerContext ctx) throws Exception {
            System.out.println("WebSocket Client disconnected!");
            group.schedule(() -> {
                try {
                    connect();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }, 10, TimeUnit.SECONDS);
        }
    }
}

在使用时，您可以按照以下步骤：

URI uri = new URI("wss://your.websocket.server.com");
NettyWebSocketClient client = new NettyWebSocketClient(uri);
client.connect();

// 发送消息
WebSocketFrame frame = new TextWebSocketFrame("Hello, WebSocket!");
client.sendMessage(frame);

// 关闭连接
client.close();

希望这些信息能够对您有所帮助！