使用 Apache Mina 通过 UDP 将数据发送回客户端

发布于 2024-11-03 18:40:35 字数 346 浏览 3 评论 0原文

我正在使用 Apache Mina 创建一个服务器来接受 UDP 客户端请求。我已阅读 Apache Mina 提供的有关 UDP Server & 的官方文档。 UDP 客户端。但是,我想知道当服务器收到消息时,我可以使用相同的会话写回UDP客户端吗(我知道UDP在网络层是无连接的,但是我可以在应用层获取远程主机的IP和端口) ),这样 UDP 客户端就会收到消息。我知道 TCP 是可能的,但我对 UDP 有点困惑。我知道这可能不完全是基于 Java 的,而是更多基于网络层的问题。如果有人能为我解决这个问题,我将不胜感激。

I am using Apache Mina to create a server to accept UDP Client requests. I have read the Official documentation provided by Apache Mina regarding UDP Server & UDP Client. However, I wished to know when the server receives a message, can I write back to the UDP Client using the same session(I know UDP is connectionless at Network Layer, however I can get the IP and PORT of the remote host at Application Layer) such that UDP Client receives a message. I know this is possible is TCP but am a little confused about UDP. I know this may not exactly be Java based but more Network Layer based question. Would appreciate if somebody could clear this for me.

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新人笑 2024-11-10 18:40:35

我得到了同样的答案并认为我会分享。

UDP 是无连接的,但是我可以使用 Apache Mina 中的相同会话来写入会话。我也尝试过将其作为示例,并且有效。

I got the answer to the same and thought i would share.

UDP is connectionless however I can use the same session which I have in Apache Mina to write to the session. I tried it as a sample also and it worked.

风筝有风,海豚有海 2024-11-10 18:40:35
@Override
    public void messageReceived(IoSession session, Object message) throws Exception {

            for (int i = 0; i < session.getService().getManagedSessions().values().toArray().length; i++) {

                IoSession aSession=(IoSession) session.getService().getManagedSessions().values().toArray()[i];
                aSession.write("Any Message");
            }



    }
@Override
    public void messageReceived(IoSession session, Object message) throws Exception {

            for (int i = 0; i < session.getService().getManagedSessions().values().toArray().length; i++) {

                IoSession aSession=(IoSession) session.getService().getManagedSessions().values().toArray()[i];
                aSession.write("Any Message");
            }



    }
逆流 2024-11-10 18:40:35

试试这个你的处理程序类

@Override
public void messageReceived(IoSession session, Object message) throws Exception {
        // response every time get data 
        byte[] b = "Received".getBytes();
        final IoBuffer responsebuffer = IoBuffer.allocate(b.length);
        responsebuffer.put(b);
        responsebuffer.flip();
        session.write(responsebuffer);
        SocketAddress remoteAddress = session.getRemoteAddress();

        if (message instanceof IoBuffer) {
            IoBuffer buffer = (IoBuffer) message;
            final CharsetDecoder decoder = getCharsetDecoder(session);
            String receivedMsg = buffer.getString(decoder);
            String data = remoteAddress + " Received: " + receivedMsg;
            server.append(data);
        }

    }

Try this your handler class

@Override
public void messageReceived(IoSession session, Object message) throws Exception {
        // response every time get data 
        byte[] b = "Received".getBytes();
        final IoBuffer responsebuffer = IoBuffer.allocate(b.length);
        responsebuffer.put(b);
        responsebuffer.flip();
        session.write(responsebuffer);
        SocketAddress remoteAddress = session.getRemoteAddress();

        if (message instanceof IoBuffer) {
            IoBuffer buffer = (IoBuffer) message;
            final CharsetDecoder decoder = getCharsetDecoder(session);
            String receivedMsg = buffer.getString(decoder);
            String data = remoteAddress + " Received: " + receivedMsg;
            server.append(data);
        }

    }
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