我之前有篇文章（）中提到过用Go语言实现http文件共享，这个版本的程序比python的实现快了点，默认情况下支持的客户端多了些，但是没有客户访问的trace，程序运行过程中，感觉像是死掉了。我想改进下，让它有trace。

代码如下： 

/*File      : httpShareWithTrace.goAuthor    : MikeE-Mail    : Mike_Zhang@live.com*/package mainimport(    "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 += "
" + f.Name() + "
"                }else{
                             strRet += "
" + f.Name() + "
"                }        }        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())}

运行效果如下：

1、启动http文件共享

2、web访问

3、后台trace

说明：最大支持2G文件的下载，限时为1个小时，这里没有用充分使用http协议，直接用文件io做的。时间有限，这里暂时达到了预期功能，够局域网使用，这个等以后有时间了做进一步的优化。