Java UDP协议定向发送数据

最新推荐文章于 2022-09-14 20:36:26 发布

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本文介绍了一个使用Java实现的UDP网络通信示例，包括发送端和接收端的代码。发送端循环向局域网内的不同地址广播固定消息，而接收端则监听特定端口并打印接收到的数据。

try {
			final String ip = "192.168.1.1";
			final int port = 9581;
			new Thread(new Runnable() {
				@Override
				public void run() {
					try {
				
						DatagramSocket datagramSocket = new DatagramSocket(port);
			
						while (true) {
							byte[] bytes = new byte[1024];
							DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length);				
							datagramSocket.receive(datagramPacket);						
							String result = new String(bytes);
							System.out.println(result);
							if (result.equals("close")) {
								break;
							}
						}
						datagramSocket.close();
					} catch (Exception e) {
						e.printStackTrace();
					}
				}
			}).start();
			DatagramSocket datagramSocket = new DatagramSocket();
			Scanner sn = new Scanner(System.in);
			while (true) {
				String content = sn.nextLine();
				if(content.startsWith("exit"))System.exit(0);
				byte[] bytes = content.getBytes();
				DatagramPacket datagramPacket = new DatagramPacket(bytes, bytes.length, InetAddress.getByName(ip),port);
				datagramSocket.send(datagramPacket);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

发送端

 try{
            DatagramSocket datagramSocket=new DatagramSocket();
            Scanner sn=new Scanner(System.in);
            while(true){
                String str="我啥都会";
                if(str.equals("0")){
                    break;
                }
                byte[] bb=str.getBytes();
                for(int i=1;i<255;i++){
                    DatagramPacket datagramPacket=new DatagramPacket(bb, bb.length,InetAddress.getByName("192.168.113."+i),9999);
                    datagramSocket.send(datagramPacket);
                    //System.out.println("发送完毕");
                }

            }
            datagramSocket.close();
        }catch ( Exception e){
            e.printStackTrace();
        }

接收端

try{
            DatagramSocket datagramSocket = new DatagramSocket(9999);
            byte[] bb=new byte[1024];
            int count=1;
            while(true) {
                DatagramPacket datagramPacket = new DatagramPacket(bb, bb.length);
                datagramSocket.receive(datagramPacket);
                if(datagramPacket.getAddress().toString().equals("/192.168.113.83")||datagramPacket.getAddress().toString().equals("/192.168.113.54"))continue;
                String result = new String(datagramPacket.getData());
                if(result.equals("0")){
                    break;
                }
                System.out.println( count+"接收消息："+result +"\n"+datagramPacket.getAddress());
                count++;
            }
            datagramSocket.close();
        }catch (Exception e){}