掌握Go语言，轻松实现SMTP邮件发送订阅功能

2023-08-17 15:32:42

使用 Go 语言实现 SMTP 邮件发送和订阅功能

SMTP 概述

SMTP（简单邮件传输协议）是一种用于在计算机之间发送电子邮件的通信协议。SMTP 服务器负责将电子邮件从发送者传输到接收者。

Go 语言实现 SMTP 邮件发送

步骤 1：导入必要的包

import (
    "fmt"
    "log"
    "net/smtp"
)

步骤 2：创建 SMTP 客户端

func createSMTPClient() (*smtp.Client, error) {
    host := "smtp.example.com"
    port := 25
    auth := smtp.PlainAuth("", "username", "password", host)
    client, err := smtp.Dial(fmt.Sprintf("%s:%d", host, port))
    if err != nil {
        return nil, err
    }
    if err = client.Auth(auth); err != nil {
        return nil, err
    }
    return client, nil
}

步骤 3：发送电子邮件

func sendEmail(from, to, subject, body string) error {
    client, err := createSMTPClient()
    if err != nil {
        return err
    }
    defer client.Close()
    msg := "From: " + from + "\n" +
        "To: " + to + "\n" +
        "Subject: " + subject + "\n\n" +
        body
    if err = client.Mail(from, []string{to}); err != nil {
        return err
    }
    if err = client.Rcpt(to); err != nil {
        return err
    }
    w, err := client.Data()
    if err != nil {
        return err
    }
    _, err = w.Write([]byte(msg))
    if err != nil {
        return err
    }
    err = w.Close()
    if err != nil {
        return err
    }
    return nil
}

订阅功能实现

步骤 1：创建订阅表单

<form action="/subscribe" method="POST">
    <input type="email" name="email" placeholder="Enter your email address">
    <button type="submit">Subscribe</button>
</form>

步骤 2：处理订阅请求

func subscribe(w http.ResponseWriter, r *http.Request) {
    email := r.FormValue("email")
    if !validateEmail(email) {
        http.Error(w, "Invalid email address", http.StatusBadRequest)
        return
    }
    if err := sendEmail("info@example.com", email, "Subscription Confirmation", "Thank you for subscribing to our newsletter!"); err != nil {
        http.Error(w, "Unable to send subscription confirmation email", http.StatusInternalServerError)
        return
    }
    http.Redirect(w, r, "/", http.StatusFound)
}