udp小问题

[corner1988]

public class Send implements Runnable{
	private DatagramSocket ds;
	public Send(DatagramSocket ds){
		this.ds=ds;
	}
	public void run(){
	try {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String line=null;
		while((br.readLine())!=null){
			if("886".equals(line)){
				break;
			}
			byte[] buf=line.getBytes();
			DatagramPacket dp=new DatagramPacket(buf, buf.length,InetAddress.getByName("127.0.0.1"),10020);
			ds.send(dp);
				
			
		}
	} catch (Exception e) {
		throw new RuntimeException("发送失败");
	}
			
			
		}
	}

public class Rece implements Runnable{
	private DatagramSocket ds;
	public Rece(DatagramSocket ds){
		this.ds=ds;
	}
  public void run(){
	  try {
		  while(true){
			  byte	[] buffer=new byte[1024];
			   DatagramPacket dp=new DatagramPacket(buffer, buffer.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");
	}
  }
}

public class chatDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception{
	DatagramSocket sendS=new DatagramSocket(10020);
	DatagramSocket receS=new DatagramSocket(10020);
	new Thread(new Send(sendS)).start();
	new Thread(new Rece(receS)).start();
	

	}

}

代码无问题
第一次运行 报发送失败
然后就报异常

Exception in thread "main" java.net.SocketException: Unrecognized Windows Sockets error: 0: Cannot bind
	at java.net.PlainDatagramSocketImpl.bind0(Native Method)
	at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:82)
	at java.net.DatagramSocket.bind(DatagramSocket.java:368)
	at java.net.DatagramSocket.<init>(DatagramSocket.java:210)
	at java.net.DatagramSocket.<init>(DatagramSocket.java:261)
	at java.net.DatagramSocket.<init>(DatagramSocket.java:234)

麻烦帮忙下，怎么回事呢

[sdojqy1122]

sendS 就不要端口号吧？
改成DatagramSocket sendS=new DatagramSocket();
反正你这报错跟端口号有关系。
先试下吧，再看看

[sdojqy1122]

当然你的收线程要先开启，后果可能收不到消息。报错是端口号问题。
new Thread(new Rece(receS)).start();//要先开启
Thread.sleep(2000);
new Thread(new Send(sendS)).start();

[njclsc]

最好用InetSocketAddress类加载你的地址信息，这样要好点 嘿嘿

[corner1988]

asa
Exception in thread "Thread-1" java.lang.RuntimeException: 发送失败
	at chatDemo.Send.run(Send.java:31)
	at java.lang.Thread.run(Thread.java:619)

怎么会失败呢

[corner1988]

找了找 代码有问题，已经解决了