windows 查看进程占用的端口号

tasklist

查看当前运行的进程

netstat

netstat -ano | findStr PID

查看某个进程占用了哪些端口

  TCP    127.0.0.1:2436         127.0.0.1:9999         ESTABLISHED     22588
  TCP    127.0.0.1:8080         0.0.0.0:0              LISTENING       22588
  TCP    127.0.0.1:8080         127.0.0.1:2476         ESTABLISHED     22588
  TCP    127.0.0.1:8080         127.0.0.1:2477         ESTABLISHED     22588
  TCP    127.0.0.1:8080         127.0.0.1:2478         ESTABLISHED     22588
  TCP    127.0.0.1:8080         127.0.0.1:2496         ESTABLISHED     22588
  TCP    192.168.231.137:2307   111.231.95.102:443     ESTABLISHED     22588
  TCP    192.168.231.137:2332   118.126.69.64:443      ESTABLISHED     22588
  TCP    192.168.231.137:2400   10.23.24.4:3128        ESTABLISHED     22588
  TCP    192.168.231.137:2405   10.23.24.4:3128        ESTABLISHED     22588
  TCP    192.168.231.137:2459   10.23.24.4:3128        ESTABLISHED     22588
  TCP    192.168.231.137:2460   10.23.24.4:3128        ESTABLISHED     22588
  TCP    192.168.231.137:2461   10.23.24.4:3128        ESTABLISHED     22588
  TCP    192.168.231.137:2462   10.23.24.4:3128        ESTABLISHED     22588
  TCP    192.168.231.137:2463   10.23.24.4:3128        ESTABLISHED     22588

netstat -ano | findStr [端口号]

查看某个端口被哪个进程占用
netstat -ano | findStr 2436

  TCP    127.0.0.1:2436         127.0.0.1:9999         ESTABLISHED     22588
  TCP    127.0.0.1:9999         127.0.0.1:2436         ESTABLISHED     12308

这里pid为22588的进程和pid为12308建立了本地tcp连接，分别占用了端口2436和9999,第四列是tcp的状态，描述三次握手，四次挥手和连接完成等状态，详情可参考：https://www.cnblogs.com/jessezeng/p/5617105.html

题外话，在mac上，我们可以使用lsof -i :3000来达到同样的效果。

taskkill

例如:
TASKKILL /IM notepad.exe
TASKKILL /PID 1230 /PID 1241 /PID 1253 /T
TASKKILL /F /IM cmd.exe /T
TASKKILL /F /FI "PID ge 1000" /FI "WINDOWTITLE ne untitle"
TASKKILL /F /FI "USERNAME eq NT AUTHORITY\SYSTEM" /IM notepad.exe
TASKKILL /S system /U 域\用户名 /FI "用户名 ne NT" /IM *
TASKKILL /S system /U username /P password /FI "IMAGENAME eq note*"