发送邮件的问题？(Issue to send mail?)

 我在java Spring中创建了邮件发送应用程序，邮件发送在本地服务器上正常工作。 我导出（战争文件）和主机进入tomcat服务器然后执行应用程序但邮件没有发送我不知道下面的代码是什么问题？ 
 
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendMail {
    public static void main(String[] args) {
        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("username","password");
                }
            });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("----@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("----@gmail.com"));
            message.setSubject("Test");
            message.setText("Hello"); 
            Transport.send(message); 
            System.out.println("Done"); 
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

i created the application for mail sending in java Spring, the mail sending properly working in local server. after i export the (war file ) and host into tomcat server then execute the app but mail was not sending i don't know what is the problem of following code? 
 
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendMail {
    public static void main(String[] args) {
        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("username","password");
                }
            });

        try {

            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("----@gmail.com"));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("----@gmail.com"));
            message.setSubject("Test");
            message.setText("Hello"); 
            Transport.send(message); 
            System.out.println("Done"); 
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

原文：https://stackoverflow.com/questions/25809460