如何在本地启动一个http服务器

// 请先在当前目录执行以下命令初始化 Go 模块：
// go mod init fileserver
// go run main.go -dir /Users/WebScoop/packs/ -port 8099 //这样子使用
package main
import (
    "flag"
    "fmt"
    "log"
    "net"
    "net/http"
    "strings"
)
func main() {
    dir := flag.String("dir", ".", "要共享的目录路径")
    port := flag.String("port", "8080", "监听端口")
    flag.Parse()
    fs := http.FileServer(http.Dir(*dir))
    http.Handle("/", fs)
    addr := ":" + *port
    lanIPs := make([]string, 0)
    otherIPs := make([]string, 0)
    seenIPs := make(map[string]struct{})
    routeIP := ""
    // UDP Dial 只用于让系统选择默认出站网卡，不会实际发送数据包。
    if conn, err := net.Dial("udp4", "8.8.8.8:80"); err == nil {
        if udpAddr, ok := conn.LocalAddr().(*net.UDPAddr); ok {
            if ip := udpAddr.IP.To4(); ip != nil && ip.IsPrivate() {
                routeIP = ip.String()
            }
        }
        conn.Close()
    }
    ifaces, err := net.Interfaces()
    if err != nil {
        log.Printf("获取本机内网 IP 失败: %v", err)
    } else {
        for _, iface := range ifaces {
            if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
                continue
            }
            isLANInterface := iface.Flags&net.FlagBroadcast != 0 && iface.Flags&net.FlagPointToPoint == 0
            addrs, err := iface.Addrs()
            if err != nil {
                log.Printf("读取网卡 %s 地址失败: %v", iface.Name, err)
                continue
            }
            for _, networkAddr := range addrs {
                var ip net.IP
                switch v := networkAddr.(type) {
                case *net.IPAddr:
                    ip = v.IP
                case *net.IPNet:
                    ip = v.IP
                }
                ip = ip.To4()
                if ip == nil || !ip.IsPrivate() {
                    continue
                }
                ipText := ip.String()
                if _, ok := seenIPs[ipText]; ok {
                    continue
                }
                seenIPs[ipText] = struct{}{}
                if isLANInterface {
                    lanIPs = append(lanIPs, ipText)
                } else {
                    otherIPs = append(otherIPs, ipText)
                }
            }
        }
    }
    if routeIP != "" {
        if _, ok := seenIPs[routeIP]; !ok {
            seenIPs[routeIP] = struct{}{}
            otherIPs = append(otherIPs, routeIP)
        }
    }
    privateIPs := append(lanIPs, otherIPs...)
    fmt.Printf("
如何在本地启动一个http服务器

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作者: catherine

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