Golang如何实现基础表单处理

<form action="/submit" method="POST">
  <input type="text" name="username" placeholder="用户名" />
  <input type="email" name="email" placeholder="邮箱" />
  <button type="submit">提交</button>
</form>

package main

import (
    "fmt"
    "net/http"
)

func formHandler(w http.ResponseWriter, r *http.Request) {
    // 解析表单数据
    r.ParseForm()

    // 获取表单字段
    username := r.Form.Get("username")
    email := r.Form.Get("email")

    // 输出到控制台
    fmt.Printf("收到用户: %s, 邮箱: %s\n", username, email)

    // 返回响应给客户端
    fmt.Fprintf(w, "提交成功！欢迎，%s！", username)
}

func main() {
    http.HandleFunc("/submit", formHandler)
    http.ListenAndServe(":8080", nil)
}

r.ParseMultipartForm(10 << 20) // 最大10MB
file, handler, err := r.FormFile("upload")
if err != nil {
    http.Error(w, "无法读取文件", 400)
    return
}
defer file.Close()