Go语言中获取IP地址的方法详解

func main() {
	fmt.Println(getIpv4())
	fmt.Println(getIpv6())
}

func getIpv4() []string {
	ips := make([]string, 0)
	for _, ip := range GetAllIp() {
		if ip.IP.To4() != nil {
			ips = append(ips, ip.IP.String())
		}
	}
	return ips
}

func getIpv6() []string {
	ips := make([]string, 0)
	for _, ip := range GetAllIp() {
		if ip.IP.To16() != nil {
			ips = append(ips, ip.IP.String())
		}
	}
	return ips
}

func GetAllIp() []*net.IPNet {
	ips := make([]*net.IPNet, 0)
	addrs, _ := net.InterfaceAddrs()
	for _, addr := range addrs {
		// 过滤调本地回环地址
		if ip, ok := addr.(*net.IPNet); ok && !ip.IP.IsLoopback() {
			ips = append(ips, ip)
		}
	}
	return ips
}

func main() {
	fmt.Println(GetUseIp())
}

func GetUseIp() string {
	dial, err := net.Dial("udp", "8.8.8.8:80") // Google的公共DNS服务器
	if err != nil {
		return "127.0.0.1"
	}
	addr := dial.LocalAddr().String()

	index := strings.LastIndex(addr, ":")
	return addr[:index]
}

package main
 
import (
	"fmt"
	"net"
)
 
func main() {
	ip := getHostIp()
	fmt.Println(ip)
}

func getHostIp() string {
	addrList, err := net.InterfaceAddrs()
	if err != nil {
		fmt.Println("get current host ip err: ", err)
		return ""
	}
	var ip string
	for _, address := range addrList {
		if ipNet, ok := address.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
			if ipNet.IP.To4() != nil {
				ip = ipNet.IP.String()
				break
			}
		}
	}
	return ip
}

package main
 
import (
	"fmt"
	"net"
	"strings"
)
 
func main() {
	ip := getHostIp()
	fmt.Println(ip)
}

func getHostIp() string {
	conn, err := net.Dial("udp", "8.8.8.8:53")
	if err != nil {
		fmt.Println("get current host ip err: ", err)
		return ""
	}
	addr := conn.LocalAddr().(*net.UDPAddr)
	ip := strings.Split(addr.String(), ":")[0]
	return ip
}