使用 java 验证 smtp 服务器凭据而不实际发送邮件
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Validate smtp server credentials using java without actually sending mail
提问by Roshan
To verify smtp server credentials shall I use transport.connect()?
要验证 smtp 服务器凭据，我应该使用transport.connect()吗？
Session session = Session.getInstance(properties,authenticator);
Transport tr=session.getTransport("smtp");
tr.connect();
Is it correct method to check smtp server credentials?
检查 smtp 服务器凭据的方法是否正确？
回答by tim_yates
This question: 'Verify mail server connection programmatically in ColdFusion'has a java solution as part of the accepted answer:
这个问题：“在 ColdFusion中以编程方式验证邮件服务器连接”有一个 java 解决方案作为已接受答案的一部分：
int port = 587;
String host = "smtp.gmail.com";
String user = "[email protected]";
String pwd = "email password";
try {
Properties props = new Properties();
// required for gmail
props.put("mail.smtp.starttls.enable","true");
props.put("mail.smtp.auth", "true");
// or use getDefaultInstance instance if desired...
Session session = Session.getInstance(props, null);
Transport transport = session.getTransport("smtp");
transport.connect(host, port, user, pwd);
transport.close();
System.out.println("success");
}
catch(AuthenticationFailedException e) {
System.out.println("AuthenticationFailedException - for authentication failures");
e.printStackTrace();
}
catch(MessagingException e) {
System.out.println("for other failures");
e.printStackTrace();
}
回答by jBak
public boolean confirmSMTP(String host, String port, String username, String password, String auth, String enctype) {
boolean result = false;
try {
Properties props = new Properties();
if (auth.equals(true)) {
props.setProperty("mail.smtp.auth", "true");
} else {
props.setProperty("mail.smtp.auth", "false");
}
if (enctype.endsWith("TLS")) {
props.setProperty("mail.smtp.starttls.enable", "true");
} else if (enctype.endsWith("SSL")) {
props.setProperty("mail.smtp.startssl.enable", "true");
}
Session session = Session.getInstance(props, null);
Transport transport = session.getTransport("smtp");
int portint = Integer.parseInt(port);
transport.connect(host, portint, username, password);
transport.close();
result = true;
} catch(AuthenticationFailedException e) {
Logging.addMsg(e.toString(), "SMTP: Authentication Failed", false, true);
} catch(MessagingException e) {
Logging.addMsg(e.toString(), "SMTP: Messaging Exception Occurred", false, true);
} catch (Exception e) {
Logging.addMsg(e.toString(), "SMTP: Unknown Exception", false, true);
}
return result;
}
