SMTP发送邮件

import java.util.Date;  import java.util.Properties;    import javax.mail.Authenticator;  import javax.mail.Message;  import javax.mail.PasswordAuthentication;  import javax.mail.Session;  import javax.mail.Transport;  import javax.mail.internet.InternetAddress;  import javax.mail.internet.MimeMessage;    import org.apache.log4j.Logger;    public class MailUtil {     private static Logger logger = Logger.getLogger(MailUtil.class);     /**    * 发送邮件    *     * @param smtp    *            SMTP服务器    * @param user    *            用户名    * @param password    *            密码    * @param subject    *            标题    * @param content    *            邮件内容    * @param from    *            发件人邮箱    * @param to    *            收件人邮箱    */   public static void send(String smtp, final String user,     final String password, String subject, String content, String from,     String to) {    try {     Properties props = new Properties();     props.put("mail.smtp.host", smtp);     props.put("mail.smtp.auth", "true");     Session ssn = Session.getInstance(props, new Authenticator() {      @Override      protected PasswordAuthentication getPasswordAuthentication() {       return new PasswordAuthentication(user, password);      }       });     MimeMessage message = new MimeMessage(ssn);//由邮件会话新建一个消息对象      InternetAddress fromAddress = new InternetAddress(from);//发件人的邮件地址      message.setFrom(fromAddress);//设置发件人      InternetAddress toAddress = new InternetAddress(to);//收件人的邮件地址      message.addRecipient(Message.RecipientType.TO, toAddress);//设置收件人     message.setSubject(subject);//设置标题     message.setText(content);//设置内容     message.setSentDate(new Date());//设置发信时间           Transport transport = ssn.getTransport("smtp");     transport.connect(smtp, user, password);     transport.sendMessage(message, message       .getRecipients(Message.RecipientType.TO));     // transport.send(message);     transport.close();     logger.info("邮件发送成功");    } catch (Exception e) {     logger.warn("邮件发送失败", e);    }   }  }