100行代码写一个golang上传下载静态服务器

许多朋友开始加入golang的大本营，然后呢都是去看看golang的一些特性，问golang足够简单吗？有什么特性？能做什么？
上边那些回答不了，有些学基础的朋友很想做一些东西，然后我就写了这个静态文件服务器，可以上传下载，麻雀虽小，但是包含了很多零碎的小知识点大家一起来巩固一下基础知识吧

    package main

import (
    "fmt"
    "html/template"
    "io"
    "net/http"
    "os"
    "path/filepath"
    "regexp"
    "strconv"
    "time"
)

var mux map[string]func(http.ResponseWriter, *http.Request)

type Myhandler struct{}
type home struct {
    Title string
}

const (
    Template_Dir = "./view/"
    Upload_Dir   = "./upload/"
)

func main() {
    server := http.Server{
        Addr:        ":9090",
        Handler:     &Myhandler{},
        ReadTimeout: 10 * time.Second,
    }
    mux = make(map[string]func(http.ResponseWriter, *http.Request))
    mux["/"] = index
    mux["/upload"] = upload
    mux["/file"] = StaticServer
    server.ListenAndServe()
}

func (*Myhandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    if h, ok := mux[r.URL.String()]; ok {
        h(w, r)
        return
    }
    if ok, _ := regexp.MatchString("/css/", r.URL.String()); ok {
        http.StripPrefix("/css/", http.FileServer(http.Dir("./css/"))).ServeHTTP(w, r)
    } else {
        http.StripPrefix("/", http.FileServer(http.Dir("./upload/"))).ServeHTTP(w, r)
    }

}

func upload(w http.ResponseWriter, r *http.Request) {

    if r.Method == "GET" {
        t, _ := template.ParseFiles(Template_Dir + "file.html")
        t.Execute(w, "上传文件")
    } else {
        r.ParseMultipartForm(32 << 20)
        file, handler, err := r.FormFile("uploadfile")
        if err != nil {
            fmt.Fprintf(w, "%v", "上传错误")
            return
        }
        fileext := filepath.Ext(handler.Filename)
        if check(fileext) == false {
            fmt.Fprintf(w, "%v", "不允许的上传类型")
            return
        }
        filename := strconv.FormatInt(time.Now().Unix(), 10) + fileext
        f, _ := os.OpenFile(Upload_Dir+filename, os.O_CREATE|os.O_WRONLY, 0660)
        _, err = io.Copy(f, file)
        if err != nil {
            fmt.Fprintf(w, "%v", "上传失败")
            return
        }
        filedir, _ := filepath.Abs(Upload_Dir + filename)
        fmt.Fprintf(w, "%v", filename+"上传完成,服务器地址:"+filedir)
    }
}

func index(w http.ResponseWriter, r *http.Request) {
    title := home{Title: "首页"}
    t, _ := template.ParseFiles(Template_Dir + "index.html")
    t.Execute(w, title)
}

func StaticServer(w http.ResponseWriter, r *http.Request) {
    http.StripPrefix("/file", http.FileServer(http.Dir("./upload/"))).ServeHTTP(w, r)
}

func check(name string) bool {
    ext := []string{".exe", ".js", ".png"}

    for _, v := range ext {
        if v == name {
            return false
        }
    }
    return true
}

github地址:[](http://github.com/widuu/staticserver)http://github.com/widuu/staticserver

本文转载自我的个人博客微度网络-网络技术支持中心 http://www.widuu.com/archives/02/959.html

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