netty-websocket包怎么配置ssl访问websocket

要在Netty中使用WebSocket SSL，需要进行以下步骤：

1. 创建SSLContext对象

KeyStore keyStore = KeyStore.getInstance("JKS");
InputStream stream = new FileInputStream("keystore.jks");
keyStore.load(stream, "password".toCharArray());
KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
kmf.init(keyStore, "password".toCharArray());

TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(keyStore);

SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);

其中，keystore.jks是包含SSL证书的密钥库文件，password是密钥库密码。

2. 配置SslContext

SslContext sslCtx = SslContextBuilder.forServer(keyManagerFactory)
    .trustManager(trustManagerFactory)
    .build();

3. 配置WebSocketServerHandler

public class WebSocketServerHandler extends SimpleChannelInboundHandler<WebSocketFrame> {

    private final WebSocketServerHandshaker handshaker;

    public WebSocketServerHandler(WebSocketServerHandshaker handshaker) {
        this.handshaker = handshaker;
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
        // 处理WebSocket消息
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        // 握手成功后，建立WebSocket连接
        handshaker.handshake(ctx.channel(), new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK));
    }
    
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        // 处理异常
    }
}

4. 配置WebSocketServerInitializer

public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel> {

    private final SslContext sslCtx;

    public WebSocketServerInitializer(SslContext sslCtx) {
        this.sslCtx = sslCtx;
    }

    @Override
    public void initChannel(SocketChannel ch) throws Exception {
        // 配置ChannelPipeline
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new HttpServerCodec());
        pipeline.addLast(new HttpObjectAggregator(65536));
        pipeline.addLast(new WebSocketServerProtocolHandler("/websocket"));
        pipeline.addLast(new WebSocketServerHandler(handshaker));
        pipeline.addLast(sslCtx.newHandler(ch.alloc()));
    }
}

其中，WebSocketServerProtocolHandler是Netty提供的WebSocket协议处理器，用于处理WebSocket握手和帧。

5. 启动WebSocket服务器

EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
    ServerBootstrap b = new ServerBootstrap();
    b.group(bossGroup, workerGroup)
        .channel(NioServerSocketChannel.class)
        .childHandler(new WebSocketServerInitializer(sslCtx))
        .option(ChannelOption.SO_BACKLOG, 128)
        .childOption(ChannelOption.SO_KEEPALIVE, true);

    ChannelFuture f = b.bind(port).sync();
    f.channel().closeFuture().sync();
} finally {
    workerGroup.shutdownGracefully();
    bossGroup.shutdownGracefully();
}

其中，sslCtx是之前创建的SSLContext对象。

以上就是在Netty中配置WebSocket SSL的步骤。