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  • 分布式通信-tcp/ip 广播

    服务端

    /**
     *  广播
     */
    public class MulticastServer {
    
        public static void main(String[] args) {
    
            try {
    
                //地址是224.0.0.0 --239.255.255.255
                InetAddress group = InetAddress.getByName("225.0.0.0");
    
                MulticastSocket socket = new MulticastSocket();
    
                for(int i=0;i<10;i++){
                    String data ="hello world";
                    byte[] bytes = data.getBytes();
                    socket.send(new DatagramPacket(bytes,bytes.length,group,8888));
                    System.out.println("send data");
                    TimeUnit.SECONDS.sleep(2);
                }
    
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    客户端,可以同时有多个客户端

    public class MulticastClient {
    
    
        public static void main(String[] args) {
            //地址是224.0.0.0 --239.255.255.255
            try {
                InetAddress group = InetAddress.getByName("225.0.0.0");
    
                MulticastSocket socket = new MulticastSocket(8888);
    
                socket.joinGroup(group); // 加到指定的組裡面
                byte[] buf = new byte[256];
                while (true){
                    DatagramPacket msgPacket = new DatagramPacket(buf, buf.length);
                    //读不到一直处于阻塞状态
                    socket.receive(msgPacket);
                    System.out.println("receive data");
                    String msg = new String(msgPacket.getData());
                    System.out.println("接收到的数据:"+msg);
                }
    
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/newlangwen/p/10383850.html
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