golang端口占用检测的使用

netstat -ano | findstr 8099

// 传入查询的端口号
// 返回端口号对应的进程PID，若没有找到相关进程，返回-1
func portInUse(portNumber int) int {
	res := -1
	var outBytes bytes.Buffer
	cmdStr := fmt.Sprintf("netstat -ano -p tcp | findstr %d", portNumber)
	cmd := exec.Command("cmd", "/c", cmdStr)
	cmd.Stdout = &outBytes
	cmd.Run()
	resStr := outBytes.String()
	r := regexp.MustCompile(`\s\d+\s`).FindAllString(resStr, -1)
	if len(r) > 0 {
		pid, err := strconv.Atoi(strings.TrimSpace(r[0]))
		if err != nil {
			res = -1
		} else {
			res = pid
		}
	}
	return res
}

func ScanPort(protocol string, hostname string, port int) bool {
 fmt.Printf("scanning port %d \n", port)
 p := strconv.Itoa(port)
 addr := net.JoinHostPort(hostname, p)
 conn, err := net.DialTimeout(protocol, addr, 3*time.Second)
 if err != nil {
 return false
 }
 defer conn.Close()
 return true
}