在 Java 中检查本地 TCP 端口未打开 [英] Checking a local TCP port is not open in Java

问题描述

是否有一种简单的方法可以确保本地端口尚未打开.默认情况下，某些 TCP 套接字服务器(例如 Grizzly)似乎不执行此检查.当缺少此检查时，服务器似乎启动并响应，但客户端代码只是连接到未关闭的旧服务器.这可能非常糟糕！

Is there a simple way to make sure that a local port is not already open. Some TCP socket servers (eg Grizzly) don't seem to do this check by default. When this check is missing, the server appears to start and respond, but the client code is just connecting to an old server that wasn't shutdown. This can be very bad!

是否有一行简单的 Java 代码可以检查以确保端口未被其他进程使用?

Is there a simple line of Java code that could check to be sure that port isn't already used by another process?

推荐答案

我看到了两种明显的方法:

I see two obvious ways to do it:

1. 尝试连接到本地主机上的该端口，如果您被接受，则该端口正在被使用
2. 尝试在该端口以侦听模式打开 ServerSocket.如果您收到已绑定"异常，则说明该端口正在被使用

希望有帮助.

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