要在Java WebSocket服務(wù)端接收二進制數(shù)據(jù)，你需要使用javax.websocket庫。以下是一個簡單的示例：

1. 確保你已經(jīng)添加了javax.websocket-api依賴到你的項目中。如果你使用的是Maven，可以在pom.xml文件中添加以下依賴：

<dependency>
    <groupId>javax.websocket</groupId>
    <artifactId>javax.websocket-api</artifactId>
    <version>1.1</version>
</dependency>

1. 創(chuàng)建一個WebSocket服務(wù)器類，如下所示：

import javax.websocket.*;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

public class WebSocketServer {

    private static final int PORT = 8080;
    private static final String HOST = "localhost";

    public static void main(String[] args) throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ch.pipeline().addLast(new WebSocketHandler());
                        }
                    });

            Selector selector = null;
            try {
                selector = Selector.open();
                b.bind(HOST, PORT).sync().channel(selector);
            } finally {
                if (selector != null) {
                    selector.close();
                }
            }

            b.connect().sync().channel(selector).sync().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }
}

1. 創(chuàng)建一個WebSocket處理器類，如下所示：

import javax.websocket.*;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

public class WebSocketHandler extends SimpleWebSocketHandler {

    @Override
    protected void onOpen(Session session, SocketChannel channel, boolean autoClose) throws IOException {
        super.onOpen(session, channel, autoClose);
        // 在這里處理連接打開事件
    }

    @Override
    protected void onMessage(Session session, ByteBuffer message) throws IOException {
        super.onMessage(session, message);
        // 在這里處理接收到的消息事件
    }

    @Override
    protected void onClose(Session session, int code, String reason, boolean remote) throws IOException {
        super.onClose(session, code, reason, remote);
        // 在這里處理連接關(guān)閉事件
    }

    @Override
    protected void onError(Session session, Throwable throwable) throws IOException {
        super.onError(session, throwable);
        // 在這里處理錯誤事件
    }
}

1. 運行WebSocket服務(wù)器：

public class Main {
    public static void main(String[] args) throws Exception {
        WebSocketServer server = new WebSocketServer();
        server.start();
    }
}

這個示例將啟動一個WebSocket服務(wù)器，監(jiān)聽在localhost:8080端口上。你可以使用任何支持WebSocket的瀏覽器或客戶端連接到這個服務(wù)器并發(fā)送和接收二進制數(shù)據(jù)。