java websock向电表设备发送信息

要向电表设备发送信息，您需要使用Java中的WebSocket API。以下是一个简单的示例代码，可以向电表设备发送一个字符串消息：

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

public class MeterDeviceClient {
    public static void main(String[] args) throws Exception {
        HttpClient httpClient = HttpClient.newHttpClient();

        WebSocket webSocket = httpClient.newWebSocketBuilder()
                .buildAsync(URI.create("ws://<电表设备IP>:<端口号>/<路径>"), new WebSocket.Listener() {
                    @Override
                    public void onOpen(WebSocket webSocket) {
                        System.out.println("WebSocket opened");
                        String message = "Hello from Java WebSocket client";
                        webSocket.sendText(message, true);
                    }

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

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

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

在上面的代码中，您需要将`<电表设备IP>`和`<端口号>`替换为您的电表设备的IP地址和端口号，`<路径>`替换为WebSocket所在的路径。然后，您可以在`onOpen`方法中编写发送消息的代码，并在`onText`方法中处理接收到的消息。