Go.网络篇-2
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package main
import (
"io/ioutil"
"os"
"io"
"log"
"net/http"
)
const (
UPLOAD_DIR = "./upload"
)
func main(){
http.HandleFunc("/",listHandler)
http.HandleFunc("/upload",uploadHandler)
http.HandleFunc("/view",viewHandler)
err := http.ListenAndServe("127.0.0.1:8080",nil)
if err != nil {
log.Fatal("ListenAndServe:", err.Error())
}
}
func uploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
io.WriteString(w,"<html><form method=\"POST\" action=\"/upload\" enctype=\"multipart/form-data\">" +
"Choose an image to upload: <input name=\"image\" type=\"file\" />" +
"<input type=\"submit\" value=\"Upload\" /></form></html>")
}
if r.Method == "POST" {
f,h,err := r.FormFile("image")
if err != nil {
http.Error(w,err.Error(),http.StatusInternalServerError)
return
}
filename := h.Filename
defer f.Close()
t,err := os.Create(UPLOAD_DIR + "/" + filename)
if err != nil {
http.Error(w,err.Error(),http.StatusInternalServerError)
return
}
defer t.Close()
if _,err := io.Copy(t,f); err != nil {
http.Error(w,err.Error(),http.StatusInternalServerError)
return
}
http.Redirect(w,r,"/view?id="+filename,http.StatusFound)
}
return
}
func viewHandler(w http.ResponseWriter, r *http.Request){
id := r.FormValue("id")
path := UPLOAD_DIR + "/" + id
if !hasfile(path) {
http.NotFound(w,r)
return
}
w.Header().Set("Content-Type","image")
http.ServeFile(w,r,path)
}
func hasfile(path string) bool {
_,err := os.Stat(path)
if err == nil {
return true
}
return os.IsExist(err)
}
func listHandler(w http.ResponseWriter, r *http.Request){
fileInfo,err := ioutil.ReadDir("./upload")
if err != nil {
http.Error(w,err.Error(),http.StatusInternalServerError)
return
}
var html string
html += "<html><ol>"
for _,info := range fileInfo {
id := info.Name()
html += "<li><a href=\"view?id=" + id + "\">" + id + "</a></li>"
}
html += "</ol></html>"
io.WriteString(w,html)
}
## 简单的图片管理网站
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