UDP通讯时,遇到异常??? - 黑马程序员技术交流社区

/*
需求:
通过udp建立简单的通讯软件;
*/
import java.io.*;
import java.net.*;
class UdpSend implements Runnable
{
private DatagramSocket ds;
UdpSend(DatagramSocket ds)
{
this.ds=ds;
}
public void run()
{
BufferedReader bufr=null;
try
{
bufr=new BufferedReader(new InputStreamReader(System.in));
String line=null;
while ((line=bufr.readLine())!=null)
{
byte[] buf=line.getBytes();
try
{
DatagramPacket dp=new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.0.4"),10000);
ds.send(dp);
}
catch (UnknownHostException ue)
{
throw new RuntimeException("您指定的主机地址未知");
}
}
}
catch (IOException io)
{
throw new RuntimeException("读取键盘数据失败");
}
finally
{
try
{
if (bufr!=null)
{
bufr.close();
}
}
catch (IOException io)
{
throw new RuntimeException("读取流关闭失败");
}
ds.close();
}
}
}
class UdpReceive implements Runnable
{
private DatagramSocket ds;
UdpReceive(DatagramSocket ds)
{
this.ds=ds;
}
public void run()
{
while (true)
{
byte[] buf=new byte[1024];
DatagramPacket dp=new DatagramPacket(buf,buf.length);
try
{
ds.receive(dp);
}
catch (IOException i)
{
throw new RuntimeException("接受数据包失败");
}
String ip=dp.getAddress().getHostAddress();
System.out.println(ip);
String line=new String(dp.getData(),0,dp.getLength());
System.out.println(line);
if (line.equals("over"))
{
break;
}
ds.close();
}
}
}
class UdpSocket
{
public static void main(String[] args)
{
DatagramSocket dsSend=null;
DatagramSocket dsReceive=null;
try
{
dsSend=new DatagramSocket(8888);
dsReceive=new DatagramSocket(10000);
}
catch (SocketException se)
{
throw new RuntimeException("Socket服务创建失败");
}
UdpSend us=new UdpSend(dsSend);
UdpReceive ur=new UdpReceive(dsReceive);
new Thread(us).start();
new Thread(ur).start();
}
}

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public void run()
{
byte[] buf=new byte[1024];
DatagramPacket dp=new DatagramPacket(buf,buf.length);
try
{
while (true){
ds.receive(dp);
String ip=dp.getAddress().getHostAddress();
System.out.println(ip);
String line=new String(dp.getData(),0,dp.getLength());
System.out.println(line);
if (line.equals("over")){break;}
}}
catch (IOException i){
throw new RuntimeException("接受数据包失败");
}
ds.close();
}

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