转的一段code

地址：http://www.cnblogs.com/MikeZhang/archive/2012/08/06/httpShareGolang20120805.html

/*
    File      : httpShareWithTrace.go
    Author    : Mike
    E-Mail    : Mike_Zhang@live.com
    */
    package main
    import(
        "fmt"
        "net/http"
        "io/ioutil"
        "log"
        "time"
        "os"
        "strings"
    )
    func getFilelist(path string) string {
            m_files,err  :=  ioutil.ReadDir(path)
            if err !=nil{
            //     println( "Get filelist error !" )
                    return""
            }
            var strRet string
            for _,f := range m_files  {
                    //    println(f.Name(),f.IsDir())
                    if path == "./" {
                            strRet += "<p><a href=\""+path+""+f.Name() +" \">" + f.Name() + "</a></p>"
                    }else{
                            strRet += "<p><a href=\""+path[1:]+"/"+f.Name() +" \">" + f.Name() + "</a></p>"
                    }
            }
            return strRet
    }
    func Handler( w http.ResponseWriter,r *http.Request ){
            println("Request ",r.URL.Path," from ",r.RemoteAddr)
            //   path := r.URL.Path[1:]
            path := "." + r.URL.Path
            if path == "./favicon.ico" {http.NotFound(w,r);return}
            if path == "./" ||  getFilelist(path) != "" {fmt.Fprintf( w,"%s",getFilelist(path));return}
            fin,err := os.Open(path)
            defer fin.Close()
            if err != nil {fmt.Fprintf( w,"404 : Not found" );return}
            readLen := 1024 * 1024
            buf := make([]byte,readLen)
            startPos := 0
            println("Transfer file ",path," ... ")
            for {
                    n,err := fin.ReadAt(buf,int64(startPos))
                    fmt.Fprintf(w,"%s",buf[:n])
                    if 0 == n || err != nil {break}
                    startPos += readLen
            }
    }
    func main(){
            port := "8080"//Default port 
            if len(os.Args)>1 { port = strings.Join(os.Args[1:2],"")}
            http.HandleFunc( "/",Handler)
            s := &http.Server{
                    Addr:           ":"+port,
                    ReadTimeout:    1 * time.Hour,
                    WriteTimeout:   1 * time.Hour,
                    MaxHeaderBytes: (1 << 31) - 1 , //Max file size is 2048M
            }
            println("Listening on port ",port,"...")
            log.Fatal(s.ListenAndServe())
    }

说明一下，这个不是我的代码，是网上copy的，觉得对新手有作用，自己也就mark一下学习学习，P.自己编译成功。