从目录上看，代码的内容非常简单。picture.go包含了所有的交互代码，list.html和upload.html则包含了使用到的模板文件，而uploads目录则保存了所有上传的image文件。

    picture.go代码内容：

    1. package main  
    3. import "io"  
    4. import "log"  
    5. import "os"  
    6. import "net/http"  
    7. import "html/template"  
    8. import "io/ioutil"  
    11. const (  
    12.     UPLOAD_DIR = "./uploads"  
    13. )  
    16. func uploadHandler (w http.ResponseWriter, r * http.Request) {  
    18.     if r.Method == "GET" {  
    20.         t, _ := template.ParseFiles("upload.html")  
    21.         t.Execute(w, nil)  
    23.     }else {  
    25.         f, h, _ := r.FormFile("image")  
    27.         filename := h.Filename  
    28.         defer f.Close()  
    30.         t, _ := os.Create(UPLOAD_DIR + "/" + filename)  
    31.         defer t.Close()  
    33.         _, err := io.Copy(t, f)  
    34.         if err != nil {  
    36.             return  
    37.         }  
    39.         http.Redirect(w, r, "view?id=" + filename, http.StatusFound)  
    40.     }  
    41. }  
    44. func viewHandler(w http.ResponseWriter, r* http.Request) {  
    46.     imageId := r.FormValue("id")  
    47.     imagePath := UPLOAD_DIR + "/" + imageId  
    48.     w.Header().Set("Content-Type", "image")  
    49.     http.ServeFile(w, r, imagePath)  
    50. }  
    53. func listHandler(w http.ResponseWriter, r* http.Request) {  
    55.     fileInfoArr, _ := ioutil.ReadDir(UPLOAD_DIR)      
    57.     locals := make(map[string] interface{})  
    58.     images := []string{}  
    60.     for _, fileInfo := range fileInfoArr {  
    62.         images = append(images, fileInfo.Name())  
    63.     }  
    65.     locals["images"] = images  
    67.     t, _ := template.ParseFiles("list.html")  
    68.     t.Execute(w, locals)  
    69. }  
    72. func main() {  
    74.     http.HandleFunc("/upload", uploadHandler)  
    75.     http.HandleFunc("/view", viewHandler)  
    76.     http.HandleFunc("/", listHandler)  
    78.     err := http.ListenAndServe(":9090", nil)  
    79.     if err != nil {  
    81.         log.Fatal("ListenAndServe: ", err.Error())  
    82.     }  
    83. }

    其实这个网站主要就3个网页。一个是显示所有图片的索引，一个是图片显示，另外一个就是图片上传页面。

    upload.html

    1. <!doctype html>  
    2. <html>  
    4. <head>  
    5. <meta charset = "utf-8">  
    6. <tilte> Uploader </title>  
    7. </head>  
    9. <body>  
    10.     <form method="post" action="/upload" enctype="multipart/form-data">  
    11.         Choose an image to upload: <input name="image" type="file" />  
    12.     <input type="submit" value="Upload" />  
    13.     </form>  
    14. </body>  
    15. </html>

    list.html

    1. <!doctype html>  
    2. <html>  
    3. <head>  
    4. <meta charset="utf-8">  
    5. <title> List </title>  
    6. </head>  
    8. <body>  
    9. <ol>  
    10.     {{range $.images}}  
    11.     <li><a href="/view?id={{.|urlquery}}"> {{.|html}} </a> </li>  
    12.     {{end}}  
    14. </ol>  
    15. </body>  
    17. </html

    Go image网站开发 - 图1