参考别人一幅原理图。
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class UDPClient
{
private DatagramSocket client=null;
private DatagramPacket packet=null;
private InetAddress host=null;
public static int portSend=8888;
public static String name="192.168.142.199";
public UDPClient()
{
try
{
host = InetAddress.getByName(name);
client=new DatagramSocket();
System.out.println("客户端准备就绪");
} catch (Exception e)
{
e.printStackTrace();
}
}
public void UDPClientRun(byte[] buffer) throws IOException
{
host = InetAddress.getByName(name);
packet=new DatagramPacket(buffer,buffer.length, host, portSend);
client.send(packet);
System.out.println("客户端发送消息");
}
public void UDPClientStop()
{
client.close();
}
}
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
public class UDPService
{
private DatagramSocket server =null;
private DatagramPacket dPacket=null;
private byte[] buffer = new byte[640];
public static int portServer=8888;
public UDPService ()
{
try
{
server= new DatagramSocket(portServer);
dPacket = new DatagramPacket(buffer, buffer.length);
} catch (Exception e)
{
e.printStackTrace();
}
}
public byte[] UDPServiceRun()
{
try
{
server.receive(dPacket);
System.out.println("服务端接收到消息");
} catch (IOException e)
{
e.printStackTrace();
System.out.println("服务端未收到消息");
}
return buffer;
}
public void UDPSeverStop()
{
server.close();
}
public String getClientName()
{
String name="";
name=dPacket.getAddress().toString();
return name;
}
}
