使用JavaMail SMTP协议发送邮件

最近需要实现通过发送邮件让用户找回密码的功能，自己用Socket写了SMTP协议的邮件发送程序，但是很多邮件服务器的anti-spam需要验证发送邮箱的合法性，所以只得放弃，后来发现用javamail包可以很方便的实现。示例程序使用gmail的邮件服务器来发送邮件。关于SMTP端口等配置见下面链接：

https://support.google.com/mail/bin/answer.py?hl=en&answer=13287

注：下面程序需导入javaee-api-6.0.jar 跟 mail.jar

1.使用TLS发送邮件

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<span style= "font-size:16px;" > 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 SendMailTLS { public static void main(String[] args) { final String username = "[email protected]" ; final String password = "password" ; Properties props = new Properties(); props.put( "mail.smtp.auth" , "true" ); props.put( "mail.smtp.starttls.enable" , "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( "[email protected]" )); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse( "[email protected]" )); message.setSubject( "Testing Subject" ); message.setText( "Dear Mail Crawler," + "\n\n No spam to my email, please!" ); Transport.send(message); System.out.println( "Done" ); } catch (MessagingException e) { throw new RuntimeException(e); } } }</span>

2.使用SSL发送邮件

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<span style= "font-size:18px;" ><span style= "font-size:16px;" > import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingExcept</span>ion; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class SendMailSSL { 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( "[email protected]" )); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse( "[email protected]" )); message.setSubject( "Testing Subject" ); message.setText( "Dear Mail Crawler," + "\n\n No spam to my email, please!" ); Transport.send(message); System.out.println( "Done" ); } catch (MessagingException e) { throw new RuntimeException(e); } } }</span>