1++++++++++++++++++++++++++++++++++++++++++
package xiaowen.udp;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class Receiver {
public static void main(String[] args) {
DatagramSocket ds=null;
try {
//定义udp连接
ds=new DatagramSocket(9999);
//定义将udp的数据包接收到什么地方
byte[] buf=new byte[1024];
//定义udp数据包
DatagramPacket dp=new DatagramPacket(buf, buf.length);
//接收数据包
ds.receive(dp);
String str=new String(dp.getData(),0,dp.getLength());
System.out.println(str);
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally{
if(ds!=null) ds.close();
}
}
}
2+++++++++++++++++++++++++++++++++++++++++++++++
package xiaowen.udp;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;
public class Sender {
public static void main(String[] args) {
DatagramSocket ds=null;
//发送端口
try {
//定义一个udp的Socket来发送数据
ds=new DatagramSocket();
//发送的字符串
String hello="hello world!";
//定义一个udp的数据发送包来发送数据,inetSocketAddres表示要接收的地址和端口号
DatagramPacket dp=new DatagramPacket(hello.getBytes(),
hello.getBytes().length,new InetSocketAddress("127.0.0.1", 9999));
ds.send(dp);
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally{
if(ds!=null) ds.close();
}
}
}