java 编写 java_websocket 多个websocket 实例

Java可以使用Java-WebSocket库来编写多个WebSocket实例。在使用Java-WebSocket库时，需要创建多个WebSocketServer实例，并为每个实例指定不同的端口号。每个WebSocketServer实例都可以处理多个WebSocket连接。在处理WebSocket连接时，可以使用WebSocket类的onOpen、onClose、onMessage和onError方法来处理WebSocket连接的打开、关闭、消息和错误事件。此外，还可以使用WebSocket类的send方法向客户端发送消息。下面是一个简单的Java-WebSocket多个WebSocket实例的示例代码：

import java.net.InetSocketAddress;
import java.util.concurrent.CopyOnWriteArrayList;

import org.java_websocket.WebSocket;
import org.java_websocket.handshake.ClientHandshake;
import org.java_websocket.server.WebSocketServer;

public class MultiWebSocketServer {

    private CopyOnWriteArrayList<WebSocket> webSockets = new CopyOnWriteArrayList<>();

    public MultiWebSocketServer(int... ports) {
        for (int port : ports) {
            WebSocketServer server = new WebSocketServer(new InetSocketAddress(port)) {
                @Override
                public void onOpen(WebSocket webSocket, ClientHandshake clientHandshake) {
                    webSockets.add(webSocket);
                    System.out.println("WebSocket opened: " + webSocket.getRemoteSocketAddress());                }

                @Override
                public void onClose(WebSocket webSocket, int i, String s, boolean b) {
                    webSockets.remove(webSocket);
                    System.out.println("WebSocket closed: " + webSocket.getRemoteSocketAddress());
                }

                @Override
                public void onMessage(WebSocket webSocket, String s) {
                    System.out.println("WebSocket message received: " + s);
                }

                @Override
                public void onError(WebSocket webSocket, Exception e) {
                    System.out.println("WebSocket error: " + e.getMessage());
                }
            };
            server.start();
            System.out.println("WebSocket server started on port " + port);
        }
    }

    public void broadcast(String message) {
        for (WebSocket webSocket : webSockets) {
            webSocket.send(message);
        }
    }

    public static void main(String[] args) {
        MultiWebSocketServer server = new MultiWebSocketServer(8080, 8081);
        server.broadcast("Hello, world!");
    }
}

此代码创建了两个WebSocketServer实例，分别监听8080和8081端口。在每个WebSocketServer实例的onOpen、onClose、onMessage和onError方法中，分别处理WebSocket连接的打开、关闭、消息和错误事件。在broadcast方法中，使用WebSocket类的send方法向所有客户端发送消息。