java websock向电表设备发送信息tcp

要使用Java WebSocket向电表设备发送TCP消息，您需要编写WebSocket客户端代码来连接到电表设备，并使用Java TCP套接字编写代码来发送消息。以下是一个简单的示例代码：

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import javax.websocket.ClientEndpoint;
import javax.websocket.CloseReason;
import javax.websocket.ContainerProvider;
import javax.websocket.DeploymentException;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.WebSocketContainer;

@ClientEndpoint
public class MyClient {
    private static CountDownLatch latch;
    private Session session;
    
    @OnOpen
    public void onOpen(Session session) {
        System.out.println("Connected to server");
        this.session = session;
        latch.countDown();
    }
    
    @OnMessage
    public void onMessage(String message) {
        System.out.println("Received message: " + message);
    }
    
    @OnClose
    public void onClose(CloseReason reason) {
        System.out.println("Disconnected from server: " + reason);
    }
    
    public static void main(String[] args) throws URISyntaxException, DeploymentException, InterruptedException, IOException {
        latch = new CountDownLatch(1);
        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        MyClient client = new MyClient();
        container.connectToServer(client, new URI("ws://localhost:8080/mywebapp/myendpoint"));
        latch.await(5, TimeUnit.SECONDS);
        
        if (client.session != null && client.session.isOpen()) {
            // Connect to TCP server
            Socket socket = new Socket("electric_meter_ip_address", 1234);
            OutputStream out = socket.getOutputStream();
            String message = "Hello, electric meter!";
            out.write(message.getBytes());
            out.flush();
            out.close();
            socket.close();
        }
    }
}

在上面的示例代码中，我们实现了一个WebSocket客户端，该客户端连接到WebSocket服务器并发送一条消息。在`onOpen`回调函数中，我们将会话Session对象保存到成员变量session中，并使用CountDownLatch等待连接建立完成。然后，我们在main方法中创建了一个Socket对象，使用它的OutputStream发送一条消息到电表设备。您需要将"electric_meter_ip_address"替换为您电表设备的IP地址。

请注意，以上代码仅为示例代码。在实际应用中，您需要根据电表设备的通信协议编写代码来构造消息并解析响应。