1：

先查看该端口是哪个进程占用了

[root@localhost ~]# lsof -i:80
COMMAND   PID USER   FD   TYPE  DEVICE SIZE NODE NAME
java    22451 root   74u  IPv6 3535878       TCP 10.22.43.52:http->10.22.161.112:vpnz (ESTABLISHED)
java    22451 root  115u  IPv6 3535977       TCP 10.22.43.52:http->10.22.161.118:toad (ESTABLISHED)
java    22451 root  125u  IPv6 3535994       TCP 10.22.43.52:http->10.22.161.120:optika-emedia (ESTABLISHED)
java    22451 root  151u  IPv6 3536546       TCP 10.22.43.52:http->10.22.161.120:fiorano-msgsvc (ESTABLISHED)

?2：杀死所有进程并查看

[root@localhost /]# kill -9 22451
[root@localhost /]# lsof -i:80

?