java多线程测试websocket demo(使用文件流)

这个demo主要是利用Java多线程来测试WebSocket通信。首先，创建一个WebSocket服务器和客户端，然后使用多线程来模拟多个客户端同时连接服务器进行通信。通过多线程测试，可以验证WebSocket通信的并发性能和稳定性。同时，可以通过多线程测试来模拟不同场景下的并发请求，以便对WebSocket服务器进行压力测试和性能优化。整个demo会包括创建WebSocket服务器和客户端的代码，以及多线程测试的代码实现。通过这个demo，可以更好地了解WebSocket通信的多线程测试方法和实现。

@ClientEndpoint
public class WebSocketClient {

    private static final AtomicInteger connectedCount = new AtomicInteger(0);
    private static final LongAdder firstFrameLatencySum = new LongAdder();
    private static final CountDownLatch latch = new CountDownLatch(20);
    private static final int MESSAGE_SIZE = 1024;

    private static final int CONCURRENCY_LEVEL = 20;

    private static final AtomicLong startTime = new AtomicLong(0);

    @OnOpen
    public void onOpen(Session session) {
        connectedCount.incrementAndGet();
    }

    @OnMessage
    public void onMessage(String message) {
        startTime.set(System.nanoTime());

        System.out.println(Thread.currentThread().getName() + ": " + message);
    }

    @OnClose
    public void onClose(Session session, CloseReason closeReason) {
        connectedCount.decrementAndGet();
    }

    public static void main(String[] args) throws URISyntaxException, Exception {
        for (int i = 0; i < CONCURRENCY_LEVEL; i++) {
            WebSocketContainer container = ContainerProvider.getWebSocketContainer();
            Session session = container.connectToServer(WebSocketClient.class, new URI("ws://you_url"));
            session.getBasicRemote().sendBinary(ByteBuffer.wrap(generateMessage()));
            latch.countDown();
        }

        latch.await(100, TimeUnit.SECONDS);
        System.out.println("Connected clients: " + connectedCount.get());
        System.out.println("Average first frame latency: " + (firstFrameLatencySum.sum() / CONCURRENCY_LEVEL) + " nanoseconds");
    }

    private static byte[] generateMessage() {
        try {
            FileInputStream fileInputStream = new FileInputStream("D:\\smn.wav");
            byte[] fileData = new byte[fileInputStream.available()];
            fileInputStream.read(fileData);
            fileInputStream.close();
            return ArrayUtils.subarray(fileData, 0, 300000);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
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