UDP协议数据传输
UDP数据传输就像,两台电脑就像两个码头(Socket)一样,码头上有集装箱货物和船只运输货物到另一个码头。码头xian相当于Socket,装货物的集装箱相当于需要发送的数据,运输的船只就是IO流了。图示如下:
思路大致如上,实现代码如下:
1.UDP_Recv.java
public class UDP_Recv {
public static void main(String[] args) throws IOException{
//接收来自服务端的消息
DatagramSocket socket = new DatagramSocket(8686);
DatagramPacket packet = new DatagramPacket(new byte[1024],1024);
while(true){
socket.receive(packet);
byte[] arr = packet.getData();
InetAddress ip = packet.getAddress();
int length = packet.getLength();
int port = packet.getPort();
System.out.println(ip+":"+port+"->"+new String(arr, 0, length,"UTF-8"));
}
}
}
2.UDP_Send.java
public class UDP_Send {
public static void main(String[] args) throws IOException{
DatagramSocket socket = new DatagramSocket();
Scanner scanner = new Scanner(System.in);
while(true){
String line = scanner.nextLine();
if("exit".equals(line)){
break;
}
DatagramPacket packet = new DatagramPacket(line.getBytes("UTF-8"),line.getBytes("UTF-8").length,InetAddress.getByName("127.0.0.1"),8686);
socket.send(packet);
}
socket.close();
}
}
运行结果如下: