package main
import (
    "fmt"
    "io"
    "net/http"
    "os"
)
const (
    upload_path string = "./upload/"
)
func helloHandle(w http.ResponseWriter, r *http.Request) {
    io.WriteString(w, "hello world!")
}
//上傳
func uploadHandle(w http.ResponseWriter, r *http.Request) {
    //從請求當中判斷方法
    if r.Method == "GET" {
        io.WriteString(w, "html>head>title>我的第一個頁面/title>/head>body>form action='' method=\"post\" enctype=\"multipart/form-data\">label>上傳圖片/label>input type=\"file\" name='file'  />br/>label>input type=\"submit\" value=\"上傳圖片\"/>/label>/form>/body>/html>")
    } else {
        //獲取文件內容 要這樣獲取
        file, head, err := r.FormFile("file")
        if err != nil {
            fmt.Println(err)
            return
        }
        defer file.Close()
        //創建文件
        fW, err := os.Create(upload_path + head.Filename)
        if err != nil {
            fmt.Println("文件創建失敗")
            return
        }
        defer fW.Close()
        _, err = io.Copy(fW, file)
        if err != nil {
            fmt.Println("文件保存失敗")
            return
        }
        //io.WriteString(w, head.Filename+" 保存成功")
        http.Redirect(w, r, "/hello", http.StatusFound)
        //io.WriteString(w, head.Filename)
    }
}
func main() {
    //啟動一個http 服務器
    http.HandleFunc("/hello", helloHandle)
    //上傳
    http.HandleFunc("/image", uploadHandle)
    err := http.ListenAndServe(":8080", nil)
    if err != nil {
        fmt.Println("服務器啟動失敗")
        return
    }
    fmt.Println("服務器啟動成功")
}