Golang Web服务器不提供静态文件

Question

我很确定我忽略了一些显而易见的事情,但我不确定是什么.我正在构建一个简单的Web应用程序,提供模板化的书籍页面.模板工作正常,图像的路径似乎正确填充,但我不断为图像本身收到404错误.

这是模板:

<h1>{{.Title}}</h1>
<h2>{{.Author.Name}}</h2>
<image src="../images/{{.ImageURI}}" />

这是应用程序本身:

package main
import (
    "html/template"
    "log"
    "net/http"
    "time"

    "github.com/gorilla/mux"
    "github.com/user/marketplace/typelibrary"
)

var books []typelibrary.Book

func ItemHandler(w http.ResponseWriter, r *http.Request) {
    params := mux.Vars(r)
    var selected typelibrary.Book       
    //Retrieve item data
    for _, item := range books {
        if item.ID == params["id"] {
            selected = item
            break
        }
    }
    t, _ := template.ParseFiles("./templates/book.html")
    t.Execute(w, selected)
}

func main() {
    router := mux.NewRouter()
    books = append(books, typelibrary.Book{ID: "1", Title: "The Fellowship of the Ring", ImageURI: "LotR-FotR.jpg", Author: &typelibrary.Author{Name: "JRR Tolkien"}})
    books = append(books, typelibrary.Book{ID: "2", Title: "The Two Towers", ImageURI: "LotR-tTT.jpg", Author: &typelibrary.Author{Name: "JRR Tolkien"}})
    books = append(books, typelibrary.Book{ID: "3", Title: "The Return of the King", ImageURI: "LotR-RotK.jpg", Author: &typelibrary.Author{Name: "JRR Tolkien"}})
    books = append(books, typelibrary.Book{ID: "4", Title: "Monster Hunter International", ImageURI: "MHI1.jpg", Author: &typelibrary.Author{Name: "Larry Correia"}})

    router.Handle("/", http.FileServer(http.Dir(".")))
    router.Handle("/images/", http.FileServer(http.Dir("../images/")))
    router.HandleFunc("/item/{id}", ItemHandler).Methods("GET")

    srv := &http.Server{
        Handler:      router,
        Addr:         ":8080",
        WriteTimeout: 10 * time.Second,
        ReadTimeout:  10 * time.Second,
    }
    log.Fatal(srv.ListenAndServe())
}

图像存储在images子目录中,直接位于可执行文件所在目录的下方.当我尝试在页面中查看损坏的图像时,路径显示为localhost:8080/images/[imagename]但出现404错误.我在这里缺少哪些配置或路由选项？

Answer 1

您正在错误地创建路线以提供图像.该Router.Handle()方法将URL与Path()匹配整个路径的匹配器匹配,而您实际上希望匹配以"/ image /"开头的任何路径.而是使用PathPrefix()匹配器创建路径:

var imgServer = http.FileServer(http.Dir("./images/"))
router.PathPrefix("/images/").Handler(http.StripPrefix("/images/", imgServer))

有关更多信息,请参阅https://godoc.org/github.com/gorilla/mux#Router.Handle.