转载▼//下载（支持断电续传）（client）
package main
import (
"os"
"io"
"strconv"
)
const (
UA = "Golang
Downloader from Kejibo.com"
)
func main() {
f, err :=
os.OpenFile("./file.exe", os.O_RDWR, 0666)
//其实这里的 O_RDWR应该是
O_RDWR|O_CREATE，也就是文件不存在的情况下就建一个空文件，但是因为windows下还有BUG，如果使用这个O_CREATE，就会直接清空文件，所以这里就不用了这个标志，你自己事先建立好文件。
if err !=
nil { panic(err) }
stat, err :=
f.Stat()
//获取文件状态
if err !=
nil { panic(err) }
f.Seek(stat.Size, 0)
//把文件指针指到文件末，当然你说为何不直接用 O_APPEND
模式打开，没错是可以。我这里只是试验。
url :=
"http://dl.google.com/chrome/install/696.57/chrome_installer.exe"
var req
http.Request
req.Method =
"GET"
req.UserAgent = UA
req.Close =
true
req.URL, err
= http.ParseURL(url)
if err !=
nil { panic(err) }
header :=
http.Header{}
header.Set("Range", "bytes=" + strconv.Itoa64(stat.Size) +
"-")
req.Header =
header
resp, err :=
http.DefaultClient.Do(&req)
if err !=
nil { panic(err) }
written, err
:= io.Copy(f, resp.Body)
if err !=
nil { panic(err) }
println("written: ", written)
}
//下载（server）
package main
import (
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"path"
"strconv"
)
var dir string
var port int
var staticHandler http.Handler
// 初始化参数
func init() {
dir =
path.Dir(os.Args[0])
flag.IntVar(&port, "port", 800,
"服务器端口")
flag.Parse()
fmt.Println("dir:", http.Dir(dir))
staticHandler =
http.FileServer(http.Dir(dir))
}
func main() {
http.HandleFunc("/", StaticServer)
err :=
http.ListenAndServe(":"+strconv.Itoa(port), nil)
if err !=
nil {
log.Fatal("ListenAndServe: ", err)
}
}
// 静态文件处理
func StaticServer(w http.ResponseWriter, req *http.Request) {
fmt.Println("path:" + req.URL.Path)
if
req.URL.Path != "/down/" {
staticHandler.ServeHTTP(w, req)
return
}
io.WriteString(w, "hello, world!\n")
}
//上传（client）
package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"mime/multipart"
"net/http"
"os"
)
func postFile(filename string, targetUrl string) error {
bodyBuf :=
&bytes.Buffer{}
bodyWriter
:= multipart.NewWriter(bodyBuf)
//关键的一步操作
fileWriter,
err := bodyWriter.CreateFormFile("uploadfile", filename)
if err !=
nil {
fmt.Println("error writing to buffer")
return err
}
//打开文件句柄操作
fh, err :=
os.Open(filename)
if err !=
nil {
fmt.Println("error opening file")
return err
}
//iocopy
_, err =
io.Copy(fileWriter, fh)
if err !=
nil {
return err
}
contentType
:= bodyWriter.FormDataContentType()
bodyWriter.Close()
resp, err :=
http.Post(targetUrl, contentType, bodyBuf)
if err !=
nil {
return err
}
defer
resp.Body.Close()
resp_body,
err := ioutil.ReadAll(resp.Body)
if err !=
nil {
return err
}
fmt.Println(resp.Status)
fmt.Println(string(resp_body))
return
nil
}
// sample usage
func main() {
target_url
:= "http://localhost:9090/upload"
filename :=
"./astaxie.pdf"
postFile(filename, target_url)
}
//上传（server）
package main
import (
"crypto/md5"
"flag"
"fmt"
"html/template"
"io"
"log"
"net/http"
"os"
"path"
"strconv"
"time"
)
var dir string
var port int
// 初始化参数
func init() {
dir =
path.Dir(os.Args[0])
flag.IntVar(&port, "port", 800,
"服务器端口")
flag.Parse()
fmt.Println("dir:", http.Dir(dir))
}
func main() {
http.HandleFunc("/upload", upload)
err :=
http.ListenAndServe(":"+strconv.Itoa(port), nil)
if err !=
nil {
log.Fatal("ListenAndServe: ", err)
}
}
// 处理/upload 逻辑
func upload(w http.ResponseWriter, r *http.Request) {
fmt.Println("method:", r.Method) //获取请求的方法
if r.Method
== "GET" {
crutime := time.Now().Unix()
h := md5.New()
io.WriteString(h, strconv.FormatInt(crutime,
10))
token := fmt.Sprintf("%x", h.Sum(nil))
t, _ := template.ParseFiles("upload.gtpl")
t.Execute(w, token)
} else
{
r.ParseMultipartForm(32 << 20)
file, handler, err :=
r.FormFile("uploadfile")
if err != nil {
fmt.Println(err)
return
}
defer file.Close()
fmt.Fprintf(w, "%v", handler.Header)
f, err :=
os.OpenFile("./upload/"+handler.Filename, os.O_WRONLY|os.O_CREATE,
0666)
if err != nil {
fmt.Println(err)
return
}
defer f.Close()
io.Copy(f, file)
}
}