Apache Commons電子郵件和重複使用SMTP連接

目前我使用Commons Email發送電子郵件，但是我一直無法找到共享發送的電子郵件之間smtp連接的方法。我有一個像下面的代碼：Apache Commons電子郵件和重複使用SMTP連接

Email email = new SimpleEmail(); 
    email.setFrom("[email protected]"); 
    email.addTo("[email protected]"); 
    email.setSubject("Hello Example"); 
    email.setMsg("Hello Example"); 
    email.setSmtpPort(25); 
    email.setHostName("localhost"); 
    email.send();

這是非常具有可讀性，但速度很慢，當我做大量的消息，我相信這是重新連接每條消息的開銷。所以我使用下面的代碼對它進行了分析，發現使用重複使用Transport可以使事情快三倍。

Properties props = new Properties(); 
    props.setProperty("mail.transport.protocol", "smtp"); 
    Session mailSession = Session.getDefaultInstance(props, null); 
    Transport transport = mailSession.getTransport("smtp"); 
    transport.connect("localhost", 25, null, null); 

    MimeMessage message = new MimeMessage(mailSession); 
    message.setFrom(new InternetAddress("[email protected]")); 
    message.addRecipient(Message.RecipientType.TO, new InternetAddress("[email protected]")); 
    message.setSubject("Hello Example"); 
    message.setContent("Hello Example", "text/html; charset=ISO-8859-1"); 

    transport.sendMessage(message, message.getAllRecipients());

所以我想知道是否有一種方法可以使Commons Email重用爲多個電子郵件發送的SMTP連接？我更喜歡Commons Email API，但表現令人痛苦。

感謝，贖金

來源

2011-07-14 Ransom Briggs

我想出了挖掘到公地源本身經過以下解決方案。這應該工作，但也有可能是更好的解決方案，我不知道

Properties props = new Properties(); 
    props.setProperty("mail.transport.protocol", "smtp"); 
    Session mailSession = Session.getDefaultInstance(props, null); 
    Transport transport = mailSession.getTransport("smtp"); 
    transport.connect("localhost", 25, null, null); 

    Email email = new SimpleEmail(); 
    email.setFrom("[email protected]"); 
    email.addTo("[email protected]"); 
    email.setSubject("Hello Example"); 
    email.setMsg("Hello Example"); 
    email.setHostName("localhost"); // buildMimeMessage call below freaks out without this 

    // dug into the internals of commons email 
    // basically send() is buildMimeMessage() + Transport.send(message) 
    // so rather than using Transport, reuse the one that I already have 
    email.buildMimeMessage(); 
    Message m = email.getMimeMessage(); 
    transport.sendMessage(m, m.getAllRecipients());

來源

2011-07-14 21:09:23