问题
The following code is supposed to send email via gmail but it gives the following error:
On my gmail account I get a message that a sign in was prevented and I should use a secure app like gmail to access my account. The source code is as shown below:
public void doSendMail(){
username = txtFrom.getText();
password= new String(txtPassword.getPassword());
to = txtTo.getText();
subject = txtSubject.getText();
email_body = jTextArea1.getText();
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "587");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.port", "587");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator(){
@Override
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(to));
message.setSubject(subject);
message.setText(email_body);
Transport.send(message);
JOptionPane.showMessageDialog(this, "Message Sent!","Sent",JOptionPane.INFORMATION_MESSAGE);
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.toString());
}
}
What can I do to the code to make it send mail via gmail?
回答1:
Your source code is perfect for sending email via gmail. May be you have to allow your account for less secure access via https://www.google.com/settings/security/lesssecureapps
Here is your code. I made very little modification to run as standalone program. It requires two jars : 1) mail-1.4.7.jar and 2) activation-1.1.1.jar
import java.util.Properties;
import java.util.Scanner;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.swing.JOptionPane;
/**
* Following jar are required:
* 1) mail-1.4.7.jar from http://central.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar
* 2) activation-1.1.1.jar from http://central.maven.org/maven2/javax/activation/activation/1.1.1/activation-1.1.1.jar
*
*/
public class Test {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.print("gmail username: ");
String username = sc.next();
System.out.print("gmail password: ");
String password = sc.next();
System.out.print("destination email address: ");
String to = sc.next();
System.out.print("subject: ");
String subject = sc.next();
System.out.print("email body: ");
String email_body = sc.next();
Test test = new Test();
test.doSendMail(username, password, to, subject, email_body);
sc.close();
}
// sends mail
public void doSendMail(final String username, final String password, String to, String subject, String email_body) {
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "587");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.port", "587");
Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {
@Override
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(to));
message.setSubject(subject);
message.setText(email_body);
Transport.send(message);
System.out.println("message sent");
JOptionPane.showMessageDialog(null, "Message Sent!", "Sent", JOptionPane.INFORMATION_MESSAGE);
} catch (Exception e) {
System.out.println(e);
JOptionPane.showMessageDialog(null, e.toString());
}
}
}
回答2:
for me is working using this properties:
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
Hope it helps.
回答3:
Try This :
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
public class SendMailSSL {
public static void main(String[] args) {
String to = "krishna14581@gmail.com";//change accordingly
//Get the session object
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("yourgmailid@gmail.com", "password");//change accordingly
}
});
//compose message
try {
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress("yourgmailid@gmail.com"));//change accordingly
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
message.setSubject("Hello");
message.setText("Testing.......");
//send message
Transport.send(message);
System.out.println("message sent successfully");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}
回答4:
just go to: https://myaccount.google.com/security go to bottom of page and enable: Allow less secure apps
来源：https://stackoverflow.com/questions/37495808/java-send-email-via-gmail