阿里云ECS服务器无法使用25端口发送

在部署项目到阿里的ECS服务器上的时候,发现邮件无法发送,报出异常

原代码:

public static void sendMail(String to,String code){

try {
// 获得连接:
Properties props = new Properties(new InputStream);
//用于发送邮件的邮箱账号密码
props.put("username", "username@163.com");
props.put("password", "password");
//smtp传输协议
props.put("mail.transport.protocol", "smtp" );
//网易邮箱的smtp服务器地址
props.put("mail.smtp.host", "smtp.163.com");
//smtp端口
props.put("mail.smtp.port", "25" );

Session defaultInstance = Session.getDefaultInstance(props);
// 构建邮件:
Message message = new MimeMessage(defaultInstance);

message.setFrom(new InternetAddress("sendName@163.com"));
// 设置收件人:

// TO:收件人 CC:抄送 BCC:暗送,密送.
message.addRecipient(RecipientType.TO, new InternetAddress(to));
// 主题:
message.setSubject("邮件主题");
// 正文和响应头
message.setContent("正文", "text/html;charset=UTF-8");
// 发送邮件:
message.saveChanges();

Transport transport = defaultInstance.getTransport("smtp");
transport.connect(props.getProperty("mail.smtp.host"),props.getProperty("username"),props.getProperty("password"));
transport.sendMessage(message,message.getAllRecipients());
transport.close();

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

抛出异常:
javax.mail.MessagingException: Could not connect to SMTP host: smtp.163.com, port: 25;

无法连接smtp.163.com和25端口

询问阿里云客服之后得知是为了防止垃圾邮件泛滥,关闭了25端口,并建议使用加密端口

由于加密端口使用的是ssl协议, 不能再使用上面的代码了

ssl协议需要加密的ssl连接,java提供了javax.net.ssl.SSLSocketFactory类,从类中获取加密的SSLSocket

代码:

public static void sendMail(String to,String code) {
Properties props = new Properties(new InputStream);
props.put("username", "username@163.com");
props.put("password", "password");

//网易的smtp服务器地址
props.put("mail.smtp.host", "smtp.163.com");
//SSLSocketFactory类的端口
props.put("mail.smtp.socketFactory.port", "465");
//SSLSocketFactory类
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
//网易提供的ssl加密端口,QQ邮箱也是该端口
props.put("mail.smtp.port", "465");

Session defaultInstance = Session.getDefaultInstance(props);

try {

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("sendName@163.com"));
message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
message.setSubject("邮件标题");
// 正文和响应头
message.setContent("邮件主题", "text/html;charset=UTF-8");
message.saveChanges();
Transport transport = defaultInstance.getTransport("smtp");
transport.connect(props.getProperty("mail.smtp.host"),props.getProperty("username"),props.getProperty("password"));
transport.sendMessage(message,message.getAllRecipients());
transport.close();
} catch (MessagingException e) {throw new RuntimeException(e);}}
这样ssl加密协议的工具类就写好了,可以放在阿里云ecs服务端上成功运行了.