java实现websocket请求

Java实现WebSocket请求需要使用Java WebSocket API。以下是一个简单的示例代码：

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.WebSocket;
import java.util.concurrent.CompletionStage;

public class WebSocketClient {
    public static void main(String[] args) {
        HttpClient client = HttpClient.newHttpClient();
        WebSocket webSocket = client.newWebSocketBuilder()
                .buildAsync(URI.create("wss://example.com"), new WebSocketListener())
                .join();
    }

    private static class WebSocketListener implements WebSocket.Listener {
        @Override
        public void onOpen(WebSocket webSocket) {
            System.out.println("WebSocket opened");
        }

        @Override
        public CompletionStage<?> onText(WebSocket webSocket, CharSequence data, boolean last) {
            System.out.println("Received message: " + data);
            return null;
        }

        @Override
        public void onClose(WebSocket webSocket, int statusCode, String reason) {
            System.out.println("WebSocket closed with status code " + statusCode + " and reason: " + reason);
        }

        @Override
        public void onError(WebSocket webSocket, Throwable error) {
            System.err.println("WebSocket error: " + error.getMessage());
        }
    }
}

在这个示例中，我们使用Java 11中的HttpClient和WebSocket API。我们创建了一个HttpClient实例，并使用它创建了一个WebSocket实例。我们还定义了一个WebSocket.Listener实现，以便在WebSocket打开、接收消息、关闭或出现错误时进行处理。