java 调用websocket接口

要在Java中调用WebSocket接口，你可以使用Java提供的WebSocket API或者使用第三方库。下面是两种方法的示例：

1. 使用Java提供的WebSocket API：

import javax.websocket.*;
import java.net.URI;

@ClientEndpoint
public class WebSocketClient {

    @OnOpen
    public void onOpen(Session session) {
        System.out.println("Connected to server: " + session.getRequestURI());
    }

    @OnMessage
    public void onMessage(String message) {
        System.out.println("Received message: " + message);
    }

    @OnClose
    public void onClose(Session session, CloseReason closeReason) {
        System.out.println("Connection closed: " + closeReason);
    }

    public static void main(String[] args) {
        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        try {
            Session session = container.connectToServer(WebSocketClient.class, URI.create("ws://example.com/socket"));
            // 可以在这里发送消息
            session.getBasicRemote().sendText("Hello, server!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

2. 使用第三方库例如Java-WebSocket（https://github.com/TooTallNate/Java-WebSocket）：

import org.java_websocket.client.WebSocketClient;
import org.java_websocket.handshake.ServerHandshake;

import java.net.URI;
import java.net.URISyntaxException;

public class WebSocketClientExample extends WebSocketClient {

    public WebSocketClientExample(URI serverUri) {
        super(serverUri);
    }

    @Override
    public void onOpen(ServerHandshake handshakedata) {
        System.out.println("Connected to server: " + getURI());
    }

    @Override
    public void onMessage(String message) {
        System.out.println("Received message: " + message);
    }

    @Override
    public void onClose(int code, String reason, boolean remote) {
        System.out.println("Connection closed: " + reason);
    }

    @Override
    public void onError(Exception ex) {
        ex.printStackTrace();
    }

    public static void main(String[] args) {
        try {
            WebSocketClientExample client = new WebSocketClientExample(new URI("ws://example.com/socket"));
            client.connect();
            // 可以在这里发送消息
            client.send("Hello, server!");
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
    }
}

这些示例代码可以帮助你在Java中调用WebSocket接口。你需要将示例代码中的"ws://example.com/socket"替换为实际的WebSocket服务器地址。