kill all port before running code example

Example 1: kill port

lsof -i:8080

Example 2: kill port

:8080.
C:\Users\psmith>netstat -ano|findstr "PID :8080"
Proto Local Address Foreign Address State PID
TCP 0.0.0.0:8081 0.0.0.0:0 LISTENING 18264

taskkill /pid 18264 /f