英文:
Go Golang to serve a specific html file
问题
http.Handle("/", http.FileServer(http.Dir("static")))
在Go语言中，可以通过指定文件路径来提供html文件。类似于Flask中的render_template函数。
你可以像下面这样实现：
http.Handle("/hello", http.FileServer(http.Dir("static/hello.html")))
英文:
http.Handle("/", http.FileServer(http.Dir("static")))
Serves the html file in static directory.
Is there any way in Go that we can specify the html file to serve?
Something like render_template in Flask
I want to do something like:
http.Handle("/hello", http.FileServer(http.Dir("static/hello.html")))
答案1
得分: 43
也许使用自定义的http.HandlerFunc会更容易：
在你的情况下，你的函数将是http.ServeFile，用于仅提供一个文件。
参考“Go Web应用程序：提供静态文件”：
在你的主页处理程序下面添加以下内容（见下文）：
http.HandleFunc("/static/", func(w http.ResponseWriter, r *http.Request) {
// 不要这样做（见下文）
http.ServeFile(w, r, r.URL.Path[1:])
})
这里使用了
net/http包的ServeFile函数来提供我们的内容。实际上，任何以/static/路径开头的请求都将由此函数处理。我发现为了正确处理请求，我必须使用以下方式去掉前导的/：
r.URL.Path[1:]
实际上，不要这样做。正如sztanpet在评论中所说，在提交的9b67a5d中，这在Go 1.6中将不再可能：
如果提供的文件或目录名是相对路径，则相对于当前目录进行解释，并且可能上溯到父目录。如果提供的名称是由用户输入构建的，则在调用
ServeFile之前应对其进行清理。作为预防措施，ServeFile将拒绝r.URL.Path包含“..”路径元素的请求。
这将防止以下“url”：
/../file
/..
/../
/../foo
/..\foo
/file/a
/file/a..
/file/a/..
/file/a\..
英文:
Maybe using a custom http.HandlerFunc would be easier:
Except in your case, your func would be the http.ServeFile one, for serving just one file.
See for instance "Go Web Applications: Serving Static Files":
> <del>Add the following below your home handler</del> (see below):
http.HandleFunc("/static/", func(w http.ResponseWriter, r *http.Request) {
// do NOT do this. (see below)
http.ServeFile(w, r, r.URL.Path[1:])
})
> This is using the net/http package’s ServeFile function to serve our content.
Effectively anything that makes a request starting with the /static/ path will be handled by this function.
One thing I found I had to do in order for the request to be handled correctly was trim the leading ‘/’ using:
r.URL.Path[1:]
Actually, do not do that.
This won't be possible in Go 1.6, as sztanpet comments, with commit 9b67a5d:
> If the provided file or directory name is a relative path, it is
interpreted relative to the current directory and may ascend to parent
directories.
If the provided name is constructed from user input, it should be sanitized before calling ServeFile.
As a precaution, ServeFile will reject requests where r.URL.Path contains a ".." path element.
That will protect against the following "url":
/../file
/..
/../
/../foo
/..\\foo
/file/a
/file/a..
/file/a/..
/file/a\\..
答案2
得分: 7
你可以使用http.StripPrefix函数。
像这样：
http.Handle("/hello/", http.StripPrefix("/hello/", http.FileServer(http.Dir("static"))))
英文:
You could use http.StripPrefix
Like this:
http.Handle("/hello/", http.StripPrefix("/hello/",http.FileServer(http.Dir("static"))))
答案3
得分: 1
也许我在这里漏掉了一些东西，但经过大量混乱的搜索，我整理了以下代码：
...
func downloadHandler(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
StoredAs := r.Form.Get("StoredAs") // 文件名
data, err := ioutil.ReadFile("files/" + StoredAs)
if err != nil { fmt.Fprint(w, err) }
http.ServeContent(w, r, StoredAs, time.Now(), bytes.NewReader(data))
}
...
其中downloadHandler作为简单上传和下载服务器的一部分被调用：
func main() {
http.HandleFunc("/upload", uploadHandler)
http.HandleFunc("/download", downloadHandler)
http.ListenAndServe(":3001", nil)
}
在Firefox和Chrome中正常工作，甚至不需要文件类型。
英文:
Maybe I missed something here, but after a lot of confused searching, I put this together:
...
func downloadHandler(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
StoredAs := r.Form.Get("StoredAs") // file name
data, err := ioutil.ReadFile("files/"+StoredAs)
if err != nil { fmt.Fprint(w, err) }
http.ServeContent(w, r, StoredAs, time.Now(), bytes.NewReader(data))
}
...
Where downloadHandler is invoked as part of a simple upload and download server:
func main() {
http.HandleFunc("/upload", uploadHandler)
http.HandleFunc("/download", downloadHandler)
http.ListenAndServe(":3001", nil)
}
Works fine with Firefox and Chrome. Doesn't even need a file type.
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