javasocket端口复用_ServerSocket复用地址是否允许绑定到已经绑定的端口？

使用Netty时&＃xff0c;令我感到惊讶的是&＃xff0c;如果使用复用地址选项&＃xff0c;它允许ServerSocket绑定到相同的地址而不会引发“已经绑定异常”

ServerBootstrap bootstrap &＃61; new ServerBootstrap(

new NioServerSocketChannelFactory(Executors

.newCachedThreadPool(), Executors.newCachedThreadPool()));

bootstrap.setPipelineFactory(new ChannelPipelineFactory() {

&＃64;Override

public ChannelPipeline getPipeline() throws Exception {

ChannelPipeline p &＃61; pipeline();

p.addLast("handler", new DummyHandler());

return p;

}

});

bootstrap.setOption("reuseAddress", true);

bootstrap.bind(new InetSocketAddress(2000));

bootstrap.bind(new InetSocketAddress(2000));

我只是以为reuseAddress允许新套接字重用关闭等待套接字&＃xff0c;但这是不同的。以下是netstat命令的结果

C:\Users\secmask>netstat -a -n|grep 2000

TCP 0.0.0.0:2000 0.0.0.0:0 LISTENING

TCP 0.0.0.0:2000 0.0.0.0:0 LISTENING

我想念什么吗&＃xff1f;这是怎么回事&＃xff1f;