Java ServerSocket 中 setReuseAddress 的目的是什么？
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What is the purpose of setReuseAddress in ServerSocket?
提问by Chaitanya
I have a simple logic Java that checks if a port is already in use or not:
我有一个简单的逻辑 Java 来检查端口是否已在使用中：
public static boolean isPortInUse(int port)
{
ServerSocket socket = null;
try {
socket = new ServerSocket(port);
socket.setReuseAddress(true);
} catch (Exception e) {
return true;
}
finally
{
if (socket != null) {
try {
socket.close();
} catch (Exception e) {
return true;
}
}
}
return false;
}
I am new to socket programming so I am not able to understand what is the use of the method "setReuseAddress"here. I have gone through this linkbut I am not getting clarity the purpose of it.
我是套接字编程的新手，所以我无法理解"setReuseAddress"这里方法的用途。我已经浏览了这个链接，但我没有弄清楚它的目的。
采纳答案by Koitoer
This explanation is coming from TCP mechanism involving some low level socket properties and protocols, basically there is an option called SO_REUSEADDR that you define when you are creating the socket, using the method setReuseAddress()enable or disable this behavior.
这个解释来自涉及一些低级套接字属性和协议的 TCP 机制，基本上有一个名为 SO_REUSEADDR 的选项，您在创建套接字时定义它，使用方法setReuseAddress()启用或禁用此行为。
The current explanation is very well defined here, take a look there. Also APIhave very good explanation
当前的解释在这里定义得很好，看看那里。此外API有很好的解释
Just take as a configuration parameter that can be modified using that method.
只需将其作为可以使用该方法修改的配置参数即可。
Enabling SO_REUSEADDR prior to binding the socket using bind(SocketAddress) allows the socket to be bound even though a previous connection is in a timeout state.
在使用 bind(SocketAddress) 绑定套接字之前启用 SO_REUSEADDR 允许绑定套接字，即使先前的连接处于超时状态。
