[网络协议]利用多线程和UDP协议实现在线聊天

发送端

public class TalkSend implements Runnable {
   private DatagramSocket client ;
   private BufferedReader reader;
   private String toIP ;
   private int toPort ;
   public TalkSend(int port,String toIP,int toPort) {
      this.toIP = toIP;
      this.toPort=toPort;
      try {
         client=new DatagramSocket(port);
         reader =new BufferedReader(new InputStreamReader(System.in));
      } catch (SocketException e) {
         e.printStackTrace();
      }
   }
   @Override
   public void run() {
      while(true) {
         String data;
         try {
            data = reader.readLine();
            byte[] datas = data.getBytes();
             //3、 封装成DatagramPacket 包裹，需要指定目的地
            DatagramPacket packet =new DatagramPacket(datas,0,datas.length,
                  new InetSocketAddress(this.toIP,this.toPort));
            //4、发送包裹send(DatagramPacket p)
            client.send(packet);
            if(data.equals("bye")) {
               break;
            }
         } catch (IOException e) {
            e.printStackTrace();
         }

      }
      // 5、释放资源
      client.close();
   }
}

接收端

public class TalkReceive implements Runnable {
   private DatagramSocket server ;
   private String from ;
   public TalkReceive(int port,String from) {
      this.from = from ;
      try {
         server=new DatagramSocket(port);
      } catch (SocketException e) {
         e.printStackTrace();
      }
   }
   @Override
   public void run() {
      while(true) {
         // 2、准备容器 封装成DatagramPacket 包裹
         byte[] container =new byte[1024*60];
         DatagramPacket packet = new DatagramPacket(container,0,container.length);
         // 3、阻塞式接收包裹receive(DatagramPacket p)
         try {
            server.receive(packet);//阻塞式
            // 4、分析数据
             byte[]  datas =packet.getData();
             int len = packet.getLength();
             String data=new String(datas,0,len);
             System.out.println(from+":"+data);
             if(data.equals("bye")) {
                break;
             }
         } catch (IOException e) {
            e.printStackTrace();
         }
      }
      // 5、释放资源
       server.close();
   }
}

测试：

public class TalkStudent {
   public static void main(String[] args) {
      new Thread(new TalkSend(7777,"localhost",9999)).start(); //发送
      new Thread(new TalkReceive(8888,"老师")).start(); //接收
   }
}

public class TalkTeacher {
   public static void main(String[] args) {
      new Thread(new TalkReceive(9999,"学生")).start(); //接收
      new Thread(new TalkSend(5555,"localhost",8888)).start(); //发送
   }
}

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