Java如何通过SSL使用Gmail发送电子邮件？
在另一个示例中，您已经了解了如何通过TLS使用GmailSMTP发送电子邮件。请参阅以下示例，如何通过TLS使用Gmail发送电子邮件？
在此示例中，您将使用SSL连接来连接到GmailSMTP服务器。与的区别在于我们用于创建邮件会话对象的属性/配置。
package org.nhooo.example.mail;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.Properties;
public class GmailSendEmailSSL {
private static final String USERNAME = "nhooo";
private static final String PASSWORD = "********";
public static void main(String[] args) throws Exception {
//电子邮件信息，例如从，到，主题和内容。
String mailFrom = "nhooo@gmail.com";
String mailTo = "nhooo@gmail.com";
String mailSubject = "SSL - Gmail Send Email Demo";
String mailText = "SSL - Gmail Send Email Demo";
GmailSendEmailSSL gmail = new GmailSendEmailSSL();
gmail.sendMail(mailFrom, mailTo, mailSubject, mailText);
}
private void sendMail(String mailFrom, String mailTo, String mailSubject,
String mailText) throws Exception {
Properties config = createConfiguration();
//创建一个邮件会话。我们需要提供用户名和
//Gmail验证的密码。
Session session = Session.getInstance(config, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
GmailSendEmailSSL.USERNAME,
GmailSendEmailSSL.PASSWORD
);
}
});
//创建电子邮件
Message message = new MimeMessage(session);
message.setSentDate(new Date());
message.setFrom(new InternetAddress(mailFrom));
message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
message.setSubject(mailSubject);
message.setText(mailText);
//发送消息
Transport.send(message, GmailSendEmailSSL.USERNAME, GmailSendEmailSSL.PASSWORD);
}
private Properties createConfiguration() {
return new Properties() {{
put("mail.smtp.host", "smtp.gmail.com");
put("mail.smtp.auth", "true");
put("mail.smtp.port", "465");
put("mail.smtp.socketFactory.port", "465");
put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
}};
}
}您可能会收到一条错误消息，提示您无法连接到smtp.gmail.com端口465。在这种情况下，请使用telnet命令检查您与服务器的连接。命令为telnetsmtp.gmail.com465，看看是否有答复。
Maven依赖
<!-- http://repo1.maven.org/maven2/javax/mail/javax.mail-api/1.5.6/javax.mail-api-1.5.6.jar -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.5.6</version>
</dependency>
<!-- http://repo1.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>