UDP传输协议的一个问题 - 黑马程序员技术交流社区

import java.io.*;
import java.net.*;
class Send2 implements Runnable
{
private DatagramSocket ds;
public Send2(DatagramSocket ds)
{
this.ds = ds;
}
public void run()
{
try
{
BufferedReader bufr =
new BufferedReader(new InputStreamReader(System.in));
String line = null;
while((line=bufr.readLine())!=null)
{
if("886".equals(line))
break;
byte[] buf = line.getBytes();
DatagramPacket dp =
new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.255"),10001);
//经过一位同学的提示把地址改成本地回路地址：127.0.0.1后就成了一行输出了，但还是不知道为什么？
ds.send(dp);
}
}
catch (Exception e)
{
throw new RuntimeException("发送失败");
}
}
}
class Rece2 implements Runnable
{
private DatagramSocket ds;
public Rece2(DatagramSocket ds)
{
this.ds = ds;
}
public void run()
{
try
{
while(true)
{
byte[] buf = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf,buf.length);
ds.receive(dp);
String ip = dp.getAddress().getHostAddress();
String data = new String(dp.getData(),0,dp.getLength());
System.out.println(ip+" : "+data);
}
}
catch (Exception e)
{
throw new RuntimeException("接收失败");
}
}
}
class UdpSendRece2
{
public static void main(String[] args)throws Exception
{
DatagramSocket sendDs = new DatagramSocket();
DatagramSocket receDs = new DatagramSocket(10001);
new Thread(new Send2(sendDs)).start();
new Thread(new Rece2(receDs)).start();
}
}

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