Question

如何将消息从单个服务器广播到多个客户端，并侦听其中一个客户端的回复。

我使用多播编程将消息广播给客户端。如果我通过TCP或UDP将我的一个客户端的消息发送回服务器，我会收到“ java.net.ConnectException：Connection refused：connect ”异常。

请帮帮我。

先谢谢。

发件人代码：

//广播消息

    msg = "This is multicast! " + counter;
                counter++;
                outBuf = msg.getBytes();

                // Send to multicast IP address and port
                InetAddress address = InetAddress.getByName("224.2.2.3");
                outPacket = new DatagramPacket(outBuf, outBuf.length, address,
                        PORT);

                socket.send(outPacket);

                System.out.println("Server sends : " + msg);

                socket.close();



                // Receiving TCP
                apSock = new Socket("131.151.88.165", 6161);
                apBuffReader = new BufferedReader(new InputStreamReader(
                        apSock.getInputStream()));
                while ((ap2Toap1 = apBuffReader.readLine()) != null) {
                    System.out.println(ap2Toap1);
                }

Receiver Code :

count++;
                inPacket = new DatagramPacket(inBuf, inBuf.length);
                socket.receive(inPacket);
                String msg = new String(inBuf, 0, inPacket.getLength());
                System.out.println("From " + inPacket.getAddress() + " Msg : "
                        + msg);

                socket.close();



                // Sending TCP
                apSock = new Socket("131.151.88.165", 6161);
                System.out.println("Hello2");
                respWriter = new PrintWriter(apSock.getOutputStream());
                System.out.println("Writing back to the server");
                respWriter.println(outBuf);
                if (respWriter != null)
                    respWriter.close();

Answer 1

您的代码中没有收听。 Java中的TCP侦听是通过ServerSocket完成的。你没有使用它。相反，你在两端使用套接字。所以你拥有的是两个客户端，没有服务器。两个TCP客户端之间无法进行通信。

Java广播和在同一端口上侦听

1 个答案: