/发送端B===>可以接受数据
public class UDPSenderB {
public static void main(String[] args) throws IOException {
//创建一个DatagramSocket 对象,准备发送和接受数据
DatagramSocket socket = new DatagramSocket(9998);
//将需要发送的数据,封装到DatagramPacket对象
byte[] data = "hello “明天吃火锅~".getBytes();
DatagramPacket packet = new DatagramPacket(data, 0, data.length, InetAddress.getLocalHost(), 9999);
socket.send(packet);
//现在接受A发送的信息
data = packet.getData();
int len = packet.getLength();
packet = new DatagramPacket(data, data.length);
socket.receive(packet);
String s = new String(data,0,len);
System.out.println(s);
System.out.println("UDPB端已经退出~");
//关闭资源
socket.close();
}
}
public class UDPReceiverA {
public static void main(String[] args) throws IOException {
//1.创建一个DatagramSocket 对象,准备在9999接收数据
DatagramSocket socket = new DatagramSocket(9999);
//2.构建一个DatagramPacket对象,准备接受数据
//一个数据包最大为64K===>2^16-1
byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
//3.调用接受方法,将通过网络传输的DatagramPacket对象
//填充到packet对象
System.out.println("正在等待接收数据...");
socket.receive(packet);
//现在将数剧进行解包
int len = packet.getLength();
byte[] bytes = packet.getData();
String s = new String(bytes,0,len);
System.out.println("接收到的数据为:"+s);
//现在发送数据
byte[] bytes1 = "好的,明天见!".getBytes();
DatagramPacket packet1 =new DatagramPacket(bytes1,0,bytes1.length, InetAddress.getLocalHost(),9998);
socket.send(packet1);
System.out.println("UDPA端已经退出~");
//关闭数据流
socket.close();
}
}
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