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java - 必须首先发出 STARTTLS 命令。 - GSMTP;使用 Gmail 帐户发送带附件的电子邮件

转载 作者:行者123 更新时间:2023-11-30 03:38:38 27 4
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我对编程很陌生,抱歉解释不力。我已经尝试过谷歌中几乎所有可用的答案。但无法弄清楚为什么会出现错误。此代码的目的是附加文件并将其发送到电子邮件地址。我没有任何电子邮件服务器。

import java.util.Properties;    
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class SendEmailMain {

public static void main(String[] args) {

final String username = "myusername@gmail.com";
final String password = "mypassword";
String emailID = "receiversUserName@yahoo.com";

Properties props = new Properties();
props.put("mail.smtp.starttls.enable", true);
props.put("mail.smtp.auth", true);
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");

Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});

try {

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(username));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(emailID));
message.setSubject("Testing Subject");
message.setText("PFA");

MimeBodyPart messageBodyPart = new MimeBodyPart();

Multipart multipart = new MimeMultipart();

messageBodyPart = new MimeBodyPart();
String file = "snap1.jpg";
String fileName = "attachmentName";
DataSource source = new FileDataSource(file);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(fileName);
multipart.addBodyPart(messageBodyPart);

message.setContent(multipart);

System.out.println("Sending");

Transport.send(message);

System.out.println("Done");

} catch (MessagingException e) {
e.printStackTrace();
}
}
}

eclipse控制台中的错误消息

Sending
com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. of6sm3574020lbb.11 - gsmtp
at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)
at javax.mail.Transport.send0(Transport.java:169)
at javax.mail.Transport.send(Transport.java:98)
at me.screenful.screenshot.ScreenShotTaker.SendEmailMain.main(SendEmailMain.java:70)

最佳答案

我已经找到它不起作用的原因了。因为我把代码从google复制到了我的项目中。在代码中

props.put("mail.smtp.starttls.enable", true);
props.put("mail.smtp.auth", true);

值 true 不在引号中。应该是这样的

props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.auth", "true");

关于java - 必须首先发出 STARTTLS 命令。 - GSMTP;使用 Gmail 帐户发送带附件的电子邮件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27272950/

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