import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.net.SocketException;

import java.net.UnknownHostException;

import org.junit.Test;

//关于UDP的编程实现，UDP（不可靠的传输，但是是最快的方式）

public class TestUdp {

@Test

public void send() {

DatagramSocket ds = null;

try {

ds = new DatagramSocket();

byte[] b = "我是要发送的数据".getBytes();

//创建一个数据报，每个数据不能大于64k,每一个都记录数据信息，发送端的IP，端口号以及发送到接收端的IP和端口号

DatagramPacket pack = new DatagramPacket(b, 0, b.length,InetAddress.getByName("127.0.0.1"),8989);

ds.send(pack);

ds.close();

} catch (SocketException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (UnknownHostException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

if(ds != null){

ds.close();

}

}

}

@Test

public void accept(){

DatagramSocket ds=null;

try {

ds = new DatagramSocket(8989);

byte[] b = new byte[1024];

DatagramPacket pack = new DatagramPacket(b, 0, b.length);

ds.receive(pack);

String str = new String (pack.getData(), 0, pack.getLength());

System.out.println(str);

} catch (SocketException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}finally{

if(ds != null){

ds.close();

}

}

}

}