阿里云服务器不能发送smtp协议邮件问题

遇到一个大大的坑。。。
之前在一个阿里云的WindowsServer可以正常发送，本地开发环境也可以，换到阿里云的centos环境下就出问题了，总是提示
一番查找之后，定位问题为：阿里云自去年之后购买的服务器均屏蔽掉了25端口，只能转而使用smtps协议的方式发送邮件。
扔代码

import java.security.Security;import java.util.Date;import java.util.Properties;import javax.mail.Authenticator;import javax.mail.Message;import javax.mail.MessagingException;import javax.mail.PasswordAuthentication;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.util.StringUtils;public class EmailService {    Logger logger = LoggerFactory.getLogger(this.getClass());    private String auth=null,host=null, user=null;    private static String password=null;    public EmailService(String auth,String host,String user,String password){        this.auth = auth;        this.host = host;        this.user = user;        this.password = password;    }    public EmailService(){    }    public void sendEmail(String toemail,String subject,String content,String type) throws Exception{        if (!StringUtils.hasText(auth)||!StringUtils.hasText(host)||!StringUtils.hasText(user)||!StringUtils.hasText(password)) {            throw new RuntimeException("参数错误！new对象的时候请传入auth、host、user、password参数，或通过set方法设置。");        }        sendMailBySSL(host, user, password, toemail, subject,content);    }    public static boolean sendMailBySSL(String smtp,String username,String password,String tousername,String subject,String content) throws AddressException, MessagingException{          Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());          final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";          // Get a Properties object          Properties props = new Properties();          props.setProperty("mail.smtp.host", smtp);          props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);          props.setProperty("mail.smtp.socketFactory.fallback", "false");          props.setProperty("mail.smtp.port", "465");          props.setProperty("mail.smtp.socketFactory.port", "465");          props.put("mail.smtp.auth", "true");          Session session = Session.getDefaultInstance(props, new Authenticator(){              protected PasswordAuthentication getPasswordAuthentication() {                  return new PasswordAuthentication(username, password);              }});               // -- Create a new message --          Message msg = new MimeMessage(session);          // -- Set the FROM and TO fields --          msg.setFrom(new InternetAddress(username));          msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(tousername,false));          msg.setSubject(subject);          msg.setText(content);//发送纯文本格式          //msg.setContent(content, "text/html;charset = gbk");//发送网页格式          msg.setSentDate(new Date());          Transport.send(msg);          System.out.println("Message sent.");          return true;         }    public static void main(String[] args) throws AddressException, MessagingException {        String subject = "11111131111111";        String content = "11111131111111";        String username = "[e-mail]";        password = "********";        String tousername = "[e-mail]";        String smtp = "smtp.ixincheng.com";        sendMailBySSL(smtp, username, password, tousername, subject, content);    }    public String getAuth() {        return auth;    }    public void setAuth(String auth) {        this.auth = auth;    }    public String getHost() {        return host;    }    public void setHost(String host) {        this.host = host;    }    public String getUser() {        return user;    }    public void setUser(String user) {        this.user = user;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}