Java开发网 - sntp客户端的UDP传输问题？

Topic: sntp客户端的UDP传输问题？

1.sntp客户端的UDP传输问题？

Posted by: flyingdd
Posted on: 2004-12-15 11:44

我做了一个SNTP的客户端程序，需要向服务器发送48byte的数据包。运行提示超时，我想问题可能出在udp数据传送上了。哪位高手帮我看看？

DatagramSocket so = new DatagramSocket(123);
so.setSoTimeout(8000);
int clientms[] = new int[48];
clientms[0]=0x23; //sntp客户端发送包信息的前8个bit为'00100011'

byte[] data = new byte[48]; //sntp message has 48 byte;

for (int i=0;i<48;i++) {
data[i] = (byte) clientms[i]; //将int数组转化为byte数组
System.out.print(data[i]+" ");
}
DatagramPacket packet = new DatagramPacket(data,data.length,
InetAddress.getByName(machine),daytimeport);

so.send(packet);

packet.setData(new byte[48]);
so.receive(packet); //如果服务器响应，将返回48byte信息

System.out.println();
byte data1[] = packet.getData();
for (int i=0;i<48;i++) {
System.out.print(data1[i]+" ");
}
so.close();