在Ruby中发送带附件的电子邮件

require 'net/smtp'
require 'mail'

def send_email_with_attachment(to, subject, body, attachment_path)
  # 创建邮件对象
  mail = Mail.new do
    from    'sender@example.com'
    to      to
    subject subject
    body    body
  end

  # 添加附件
  attachment = Mail::Attachment.new
  attachment.content_type = 'application/octet-stream'
  attachment.filename = File.basename(attachment_path)
  attachment.content = File.read(attachment_path)
  mail.add_attachment(attachment)

  # 发送邮件
  smtp = Net::SMTP.new('smtp.example.com', 587)
  smtp.enable_starttls
  smtp.start('example.com', 'username', 'password', :login) do |smtp|
    smtp.send_message(mail.to_s, 'sender@example.com', to)
  end
end

# 调用发送邮件函数
send_email_with_attachment('recipient@example.com', 'Hello', 'This is the body of the email.', '/path/to/attachment.pdf')