測試過公司、以前學校的郵件伺服器（未加密），以及 Gmail、Yeah、QQ 的 SSL 連線，還有 Gmail 的 TLS 連線。
其中 TLS 連線可以參考 [1] 的討論，原本我以為 TLS 是加密連線
不過似乎 TLS 其實是明文，因此需要加密內文的 SSL 在設定屬性時要用 "smtps"，但 TLS 要用 "smtp"。
public class MailSend {
private boolean authFlag = true;
private int typeOfConnection = 0; // 0: none, 1: TLS, 2: SSL
public boolean sendMail(String sender, String receiver, String ccList , String smtpHost, int port,
String username, String passwd, String Subject) {
InternetAddress[] address = null;
// mail body
StringBuilder messageText = new StringBuilder();
messageText.append("<html><body>");
messageText.append("content");
messageText.append("</body></html>");
//System.out.println(messageText.toString());
boolean sessionDebug = false;
try {
// encoding
System.setProperty("mail.mime.charset", "utf8");
// properties
java.util.Properties props = null;
switch (typeOfConnection) {
case 1: // TLS
props = getPropertyInTls(smtpHost, port);
break;
case 2: // SSL
props = getPropertyInSsl(smtpHost, port);
break;
default:
props = getPropertyInNormalConnection(smtpHost, port);
break;
}
// construct a mail session
javax.mail.Session mailSession = javax.mail.Session.getDefaultInstance(props, null);
mailSession.setDebug(sessionDebug);
Message msg = new MimeMessage(mailSession);
// mail sender
msg.setFrom(new InternetAddress(sender));
// mail recievers
address = InternetAddress.parse(receiver, false);
msg.setRecipients(Message.RecipientType.TO, address);
// mail cc
msg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(ccList));
// mail's subject
msg.setSubject(Subject);
// mail's sending time
msg.setSentDate(new Date());
MimeBodyPart mbp = new MimeBodyPart();
// mail's charset
mbp.setContent(messageText.toString(), "text/html; charset=utf8");
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp);
msg.setContent(mp);
if (this.authFlag) {
Transport transport = null;
if(this.authFlag == 0) transport = mailSession.getTransport("smtp");
else transport = mailSession.getTransport("smtps");
transport.connect(smtpHost, username, passwd);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
} else {
Transport.send(msg);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
public boolean setTypeOfConnection (String type) {
type = type.toLowerCase();
if(type.compareTo("tls") == 0) {
this.typeOfConnection = 1;
return true;
}
else if(type.compareTo("ssl") == 0) {
this.typeOfConnection = 2;
return true;
}
else if(type.compareTo("none") == 0) {
this.typeOfConnection = 0;
return true;
}
return false;
}
private java.util.Properties getPropertyInNormalConnection (String smtpHost, int port) {
java.util.Properties props = new java.util.Properties();
props.put("mail.host", smtpHost);
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.port", port);
props.put("mail.smtp.auth", String.valueOf(this.authFlag));
return props;
}
private java.util.Properties getPropertyInTls (String smtpHost, int port) {
java.util.Properties props = new java.util.Properties();
props.put("mail.host", smtpHost);
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable","true");
props.put("mail.smtp.port", port);
return props;
}
private java.util.Properties getPropertyInSsl (String smtpHost, int port) {
java.util.Properties props = new java.util.Properties();
props.put("mail.host", smtpHost);
props.put("mail.smtps.auth", "true");
props.put("mail.smtps.port", port);
props.put("mail.smtps.socketFactory.port", port);
props.put("mail.smtps.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtps.socketFactory.fallback", "true");
props.put("mail.smtps.ssl.enable", "true");
return props;
}
}Properties 參數可以參考：com.sun.mail.smtp補充：
要用 SSL/TLS 加密時可能需要加上
props.setProperty("mail.smtp.ssl.trust", "*");這段是 certification 一律通過不檢查(信任範圍設為 *)，需要檢查憑證時就依照自己的環境狀況去設定。參考資料：
1、Using JavaMail with TLS
沒有留言:
張貼留言