windows更改连接数支持

测试netty支持连接数时错误
java.lang.IllegalStateException: failed to create a child event loop
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58)
at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:51)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:85)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:80)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:49)
at test.PressClient$BackupPressClient.run(PressClient.java:83)
at java.lang.Thread.run(Thread.java:745)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:150)
at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:141)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:116)
at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:34)
at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
... 8 more
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:125)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:69)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:141)
at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
at java.nio.channels.Pipe.open(Pipe.java:150)
at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:148)
... 12 more
Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): bind
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:444)
at sun.nio.ch.Net.bind(Net.java:436)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:91)
... 20 more

使用命令netsh int ipv4 set dynamicport tcp start=10000 num=55535

参考：http://blog.chinaunix.net/uid-116213-id-3150158.html