报错：The Tomcat connector configured to listen on port 8080 failed to start. The port may already be

报错：
org.apache.catalina.LifecycleException: Protocol handler start failed
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1008) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:226) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:259) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:197) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:311) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:164) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) [spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
at com.cui.springboot01.Springboot01HelloworldApplication.main(Springboot01HelloworldApplication.java:10) [classes/:na]
Caused by: java.net.BindException: Address already in use: bind
at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_131]
at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_131]
at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_131]
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_131]
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_131]
at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:239) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:213) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1116) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1202) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:568) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1005) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
… 14 common frames omitted

2019-06-19 10:36:01.908 INFO 8612 — [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-06-19 10:36:01.923 INFO 8612 — [ main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2019-06-19 10:36:01.928 ERROR 8612 — [ main] o.s.b.d.LoggingFailureAnalysisReporter :

---

APPLICATION FAILED TO START

---

Description:

The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector’s configuration, identify and stop any process that’s listening on port 8080, or configure this application to listen on another port.

2019-06-19 10:36:01.930 INFO 8612 — [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService ‘applicationTaskExecutor’

Process finished with exit code 1

截图如下：

原因：8080端口被占用

解决办法：
步骤1：打开cmd命令窗口 输入如下指令查看所有端口和PID：netstat -ano

步骤2：找到端口所在的PID

步骤3： 输入以下指令找到对应的进程： tasklist | findstr "17300"

步骤4：输入以下指令杀掉该进程 ： taskkill /f /t /im java.exe

最后，再启动服务，正常启动，问题解决。截图如下：