端口已被占用

报的错误

Exception in thread "Thread-76" java.net.BindException: Address already in use: bindat sun.nio.ch.Net.bind0(Native Method)at sun.nio.ch.Net.bind(Net.java:433)at sun.nio.ch.Net.bind(Net.java:425)at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:141)at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:562)at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1334)at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:506)at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:491)at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:973)at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:260)at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:356)at io.netty.util.concurrent.AbstractEventExecutor.runTask$$$capture(AbstractEventExecutor.java:174)at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java)at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:167)at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java)at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995)at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)at java.lang.Thread.run(Thread.java:748)