java TCP 允许的端口范围
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Allowed Port Range for TCP
提问by Mike G
I am trying to generate a random port number for a TCP connection. From : http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbersI know that the range of ports is from 1024 to 49151 are not reserved, but some of them are UDP only, how can I generate only valid TCP port numbers?
我正在尝试为 TCP 连接生成一个随机端口号。来自：http: //en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers我知道端口的范围是从 1024 到 49151 不是保留的，但其中一些只是 UDP，我怎样才能只生成有效的 TCP 端口号？
回答by Eric
If you bind to port 0, the OS will select a valid, not-in-use port.
如果绑定到端口 0，操作系统将选择一个有效的、未使用的端口。
If you need random as opposed to arbitrary, anything from 49152–65535 should be safe for automatic use like this, so just select a random number within that range. (you may have to retry if that port turns out to be in use, however.)
如果您需要随机而不是任意，那么 49152-65535 之间的任何内容对于像这样自动使用应该是安全的，因此只需在该范围内选择一个随机数。（但是，如果该端口正在使用中，您可能必须重试。）
