go - request.Post 表单提交时数组为空

Question

我正在尝试在 go 中处理一个简单的 html 表单。但是，我在提交时无法获得任何帖子数据。 r.Form 映射始终为 []。不知道我哪里出错了。

提前致谢。

这里是代码 http://play.golang.org/p/aZxPCcRAVV

package main

import (
    "html/template"
    "log"
    "net/http"
)

func rootHandler(w http.ResponseWriter, r *http.Request) {
    t, _ := template.New("form.html").Parse(form)
    t.Execute(w, "")
}

func formHandler(w http.ResponseWriter, r *http.Request) {
    log.Println(r.Form)
    rootHandler(w, r)
}

func main() {
    http.HandleFunc("/", rootHandler)
    http.HandleFunc("/login", formHandler)
    http.ListenAndServe("127.0.0.1:9999", nil)
}

var form = `
<h1>Login</h1>
<form action="/login" method="POST">
<div><input name="username" type="text"></div>
<div><input type="submit" value="Save"></div>
</form>
`

Answer 1

看来您需要先调用 ParseForm。来自 Go 文档

// Form contains the parsed form data, including both the URL
// field's query parameters and the POST or PUT form data.
// This field is only available after ParseForm is called.
// The HTTP client ignores Form and uses Body instead.
Form url.Values

还有一些代码可以让您的示例正常工作。

func formHandler(w http.ResponseWriter, r *http.Request) {
    err := r.ParseForm()
    if err != nil {
       //handle error http.Error() for example
       return
    }
    log.Println(r.Form)
    rootHandler(w, r)
}