Golang实现Web表单提交与验证方法

  用户名：
  

  邮箱：
  

  提交

func showForm(w http.ResponseWriter, r *http.Request) {
    html := `

  用户名：
  

  邮箱：
  

  提交

`
    w.Header().Set("Content-Type", "text/html")
    w.Write([]byte(html))
}

func handleSubmit(w http.ResponseWriter, r *http.Request) {
    if r.Method != "POST" {
        http.Error(w, "仅支持POST请求", http.StatusMethodNotAllowed)
        return
    }
// 解析表单数据
err := r.ParseForm()
if err != nil {
    http.Error(w, "解析表单失败", http.StatusBadRequest)
    return
}

username := r.FormValue("username")
email := r.FormValue("email")

// 输出接收到的数据（实际应用中应写入数据库等）
fmt.Fprintf(w, "用户名：%s\n", username)
fmt.Fprintf(w, "邮箱：%s\n", email)
}

func handleSubmit(w http.ResponseWriter, r *http.Request) {
    if r.Method != "POST" {
        http.Error(w, "仅支持POST请求", http.StatusMethodNotAllowed)
        return
    }
err := r.ParseForm()
if err != nil {
    http.Error(w, "解析表单失败", http.StatusBadRequest)
    return
}

username := r.FormValue("username")
email := r.FormValue("email")

var errors []string

if username == "" {
    errors = append(errors, "用户名不能为空")
}

if email == "" {
    errors = append(errors, "邮箱不能为空")
} else if !strings.Contains(email, "@") {
    errors = append(errors, "邮箱格式不正确")
}

if len(errors) > 0 {
    fmt.Fprintf(w, "提交失败：
")
    for _, msg := range errors {
        fmt.Fprintf(w, "- %s
", msg)
    }
    return
}

fmt.Fprintf(w, "提交成功！
")
fmt.Fprintf(w, "用户名：%s
", username)
fmt.Fprintf(w, "邮箱：%s
", email)
}

func main() {
    http.HandleFunc("/", showForm)
    http.HandleFunc("/submit", handleSubmit)
fmt.Println("服务器运行在 :8080")
http.ListenAndServe(":8080", nil)
}