UDP协议传输

/*

*UDP不需要建立连接速度快。

*客户端发送请求，允许服务端接收不到。

* 可用于广告信息推送，广告短信。

*使用的是 DatagramSocket

*/

==================客户端=================

 

package com.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDP_Clinet {
 public static void main(String[] args) throws IOException {
  DatagramSocket ds =new DatagramSocket();
  byte[] buf ="UDP 我来了".getBytes();
  int length = buf.length;
  InetAddress address=InetAddress.getByName("localhost") ;
  int port = 10086;
  DatagramPacket dp =new DatagramPacket(buf, length, address, port);
  ds.send(dp);
  ds.close();
 }
}

==================服务端=================

package com.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDP_Server {

 public static void main(String[] args) throws IOException {
  DatagramSocket ds =new DatagramSocket(10086);
  byte[] buf =new byte[1024];
  int length = buf.length;
  DatagramPacket dp = new DatagramPacket(buf, length);
  ds.receive(dp);
  InetAddress ia = dp.getAddress();
  byte[] buf1 =dp.getData();
  int length1 =dp.getLength();
  String str =new String(buf1, 0, length1);
  System.out.println(ia +"==="+ str);
  ds.close();
 }

}
=====结果========

/127.0.0.1===UDP 我来了