Failed to start component [Connector[HTTP/1.1-20001]]报错

Failed to start component [Connector[HTTP/1.1-20001]]
报错，
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:256)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:198)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:300)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243)
at com.QmsApplication.main(QmsApplication.java:40)
Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1020)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
… 13 common frames omitted
Caused by: java.net.BindException: Address already in use: bind
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:437)
at sun.nio.ch.Net.bind(Net.java:429)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:210)
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1150)
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:591)
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1018)
… 14 common frames omitted

因为20001端口被占用：
把进程kill掉，从新启动项目就好了
查20001端口占用： netstat -ano | findstr “20001”
window10系统杀进程： taskkill -PID 8082 -F
查看系统所有进程：netstat -ano

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