先查找是端口号被哪个进程占用，再杀死进程

 C:\Users\xiangchengkang>netstat -ano | findstr 8080
  TCP    127.0.0.1:8080         0.0.0.0:0              LISTENING       13604
  TCP    127.0.0.1:8080         127.0.0.1:10118        ESTABLISHED     13604
  TCP    127.0.0.1:10115        127.0.0.1:8080         TIME_WAIT       0
  TCP    127.0.0.1:10118        127.0.0.1:8080         ESTABLISHED     10760
  TCP    192.168.30.104:6497    157.148.42.213:8080    ESTABLISHED     5128

C:\Users\xiangchengkang>taskkill -pid 13604 -f
成功: 已终止 PID 为 13604 的进程。

C:\Users\xiangchengkang>