这个问题很常见，解决起来也不难，就是你想要开启的端口被占用了,那么如何排查是哪个进程占用了呢？比如看windows下80端口被哪个程序占用，Linux下80端口被那个程序占用。
java.net.BindException: Address already in use: bind
at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_65]
at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_65]
at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_65]
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_65]
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_65]
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:340) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:765) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:473) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.connector.Connector.startInternal(Connector.java:986) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:239) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:194) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:151) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:293) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:141) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.2.RELEASE.jar:1.3.2.RELEASE]
at com.didispace.Chapter1Application.main(Chapter1Application.java:10) [classes/:na]
windows下查看80端口占用
直接打开cmd，执行netstat -ano | findstr "80"，最后一栏是进程ID：
netstat -ano | findstr "80"
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 1324
TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING 2932
TCP 0.0.0.0:18080 0.0.0.0:0 LISTENING 20836
TCP 0.0.0.0:20080 0.0.0.0:0 LISTENING 12476
TCP 10.18.74.12:49580 10.16.133.155:22 ESTABLISHED 17508
TCP 10.18.74.12:51158 123.58.182.253:80 ESTABLISHED 19244
TCP 10.18.74.12:51452 123.58.182.253:80 ESTABLISHED 19244
TCP 10.18.74.12:53706 123.58.182.253:80 ESTABLISHED 19244
TCP 10.18.74.12:54247 123.58.182.253:80 ESTABLISHED 19244
TCP 10.18.74.12:54555 42.202.154.56:80 CLOSE_WAIT 8360
TCP 10.18.74.12:54563 36.110.236.217:80 CLOSE_WAIT 19244
TCP 10.18.74.12:54568 10.16.13.129:80 TIME_WAIT 0
TCP 10.18.74.12:54574 10.16.12.90:80 TIME_WAIT 0
TCP 10.18.74.12:54724 220.181.78.89:80 ESTABLISHED 19244
TCP 10.18.74.12:54725 10.16.13.129:8088 TIME_WAIT 0
TCP 10.18.74.12:54726 10.16.13.129:8088 TIME_WAIT 0
TCP 10.18.74.12:54728 101.226.89.156:80 CLOSE_WAIT 19244
TCP 10.18.74.12:54733 10.16.13.129:80 ESTABLISHED 1224
TCP 10.18.74.12:54737 10.16.13.18:8080 ESTABLISHED 5256
TCP 10.18.74.12:54741 10.16.13.18:8080 CLOSE_WAIT 5256
TCP 10.18.74.12:54742 10.16.13.18:8080 CLOSE_WAIT 5256
TCP 10.18.74.12:54744 36.110.170.48:80 ESTABLISHED 19244
TCP 10.18.74.12:54924 36.110.170.48:80 ESTABLISHED 19244
TCP 10.18.74.12:54942 220.181.158.203:80 ESTABLISHED 19244
TCP 10.18.74.12:54943 180.149.131.104:80 ESTABLISHED 5256
TCP 10.18.74.12:54957 180.149.131.104:443 ESTABLISHED 5256
TCP 10.18.74.12:54961 180.149.131.104:443 ESTABLISHED 5256
TCP 10.18.74.12:54969 180.97.104.146:443 ESTABLISHED 5256
TCP 10.18.74.12:54980 106.38.179.49:443 TIME_WAIT 0
TCP 10.18.74.12:54983 10.16.13.129:8088 TIME_WAIT 0
TCP 10.18.74.12:54984 10.16.13.129:8088 ESTABLISHED 1224
TCP 10.18.74.12:55862 123.58.182.253:80 ESTABLISHED 19244
TCP 10.18.74.12:58582 10.16.15.110:22 ESTABLISHED 15980
TCP 10.18.74.12:60013 123.151.77.237:80 ESTABLISHED 8360
TCP 10.18.74.12:60180 180.163.238.136:443 ESTABLISHED 6068
TCP 10.18.74.12:60267 10.16.13.129:8000 ESTABLISHED 1224
TCP 10.18.74.12:60268 101.199.97.175:80 ESTABLISHED 6068
TCP 10.18.74.12:60802 10.16.133.155:22 ESTABLISHED 19872
TCP 10.18.74.12:62839 61.155.183.248:8000 CLOSE_WAIT 8268
TCP 10.18.74.12:62910 10.16.15.123:22 ESTABLISHED 18072
TCP 127.0.0.1:9080 0.0.0.0:0 LISTENING 13128
TCP [::]:80 [::]:0 LISTENING 1324
TCP [::]:8080 [::]:0 LISTENING 2932
TCP [::]:18080 [::]:0 LISTENING 20836
TCP [::]:20080 [::]:0 LISTENING 12476
UDP 127.0.0.1:54480 *:* 744
UDP [fe80::ceb:eb83:7d1c:c622%11]:1900 *:*
1872
UDP [fe80::ceb:eb83:7d1c:c622%11]:2177 *:*
1872
UDP [fe80::ceb:eb83:7d1c:c622%11]:61729 *:*
1872
UDP [fe80::2064:e86b:3b5d:b585%24]:546 *:*
412
UDP [fe80::2064:e86b:3b5d:b585%24]:1900 *:*
1872
UDP [fe80::2064:e86b:3b5d:b585%24]:2177 *:*
1872
UDP [fe80::9c6b:6f7f:980b:e794%26]:546 *:*
412
UDP [fe80::9c6b:6f7f:980b:e794%26]:1900 *:*
1872
UDP [fe80::9c6b:6f7f:980b:e794%26]:2177 *:*
1872
UDP [fe80::9c6b:6f7f:980b:e794%26]:5353 *:*
1728
可以通过tasklist | findstr 1324 找到是哪个任务在使用
tasklist | findstr 1324
httpd.exe 1324 Services 0 4,084 K
taskkill可以终止PID
taskkill /pid 1324 /F
成功: 已终止 PID 为 1324 的进程。
Linux下查看80端口占用
使用netstat查看使用情况
netstat -anlp | grep "80"
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 27010/nginx
tcp 0 0 104.128.91.247:33040 119.147.192.232:80 TIME_WAIT -
tcp 0 0 104.128.91.247:59334 192.30.252.153:80 TIME_WAIT -
tcp 0 0 104.128.91.247:33066 119.147.192.232:80 ESTABLISHED 28977/php
tcp 0 0 104.128.91.247:52152 120.92.102.53:80 TIME_WAIT -
tcp 0 0 104.128.91.247:45424 216.58.193.206:80 TIME_WAIT -
tcp 0 0 104.128.91.247:55166 101.37.21.224:80 TIME_WAIT -
tcp 0 0 104.128.91.247:58314 188.166.214.151:80 TIME_WAIT -
tcp 0 0 104.128.91.247:59240 106.185.31.105:80 TIME_WAIT -
tcp 0 0 104.128.91.247:49682 104.128.91.247:80 TIME_WAIT -
tcp 0 0 104.128.91.247:33494 118.178.215.65:80 TIME_WAIT -
tcp 0 0 104.128.91.247:36536 47.95.47.253:80 TIME_WAIT -
tcp 0 0 104.128.91.247:59324 192.30.252.153:80 TIME_WAIT -
tcp 0 0 104.128.91.247:34184 106.11.61.7:80 TIME_WAIT -
tcp 0 0 104.128.91.247:42526 120.55.250.143:80 TIME_WAIT -
tcp 0 0 104.128.91.247:35170 47.95.47.253:80 TIME_WAIT -
tcp 0 0 104.128.91.247:59328 106.185.31.105:80 TIME_WAIT -
tcp 0 0 104.128.91.247:45050 103.37.167.63:80 TIME_WAIT -
tcp 0 0 104.128.91.247:80 107.182.184.12:46066 TIME_WAIT -
tcp 0 0 104.128.91.247:35250 47.95.47.253:80 TIME_WAIT -
unix 2 [ ACC ] STREAM LISTENING 727180 1/init @/com/ubuntu/upstart
lsof查看文件描述符
lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
nginx 27010 root 8u IPv4 1090465385 0t0 TCP *:http (LISTEN)
nginx 27012 web 8u IPv4 1090465385 0t0 TCP *:http (LISTEN)
nginx 27013 web 8u IPv4 1090465385 0t0 TCP *:http (LISTEN)
nginx 27014 web 8u IPv4 1090465385 0t0 TCP *:http (LISTEN)
nginx 27015 web 8u IPv4 1090465385 0t0 TCP *:http (LISTEN)