import lombok.extern.slf4j.Slf4j;

import java.util.Properties;

import javax.mail.*;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
 * <b>發送郵件工具類</b><br/>
 * <b>Create on:</b>2016/10/9 16:14<br/>
 *
 * @author : liud<br/>
 */
@Slf4j
public class SendMailUtil {

  /**
   * 發送郵件
   * @param smtpHost
   * @param fromUser
   * @param fromUserPassword
   * @param emailPort
   * @param toUser
   * @param subject
   * @param messageText
   */
  public static boolean doSendEmail(String smtpHost, final String fromUser,
                final String fromUserPassword, String userName, String emailPort, String toUser, String subject,
                String messageText) throws Exception {
    boolean flag = false;
    try {
      Properties props = new Properties();
      props.put("mail.smtp.host", smtpHost);
      props.put("mail.smtp.port", emailPort);
      props.put("mail.smtp.auth", "true");
      Session session = Session.getDefaultInstance(props, new Authenticator(){
        protected PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(fromUser, fromUserPassword);
        }});
      MimeMessage message = new MimeMessage(session);
      // 發件人
      InternetAddress from = new InternetAddress(fromUser);
      message.setFrom(from);
      // 收件人
      InternetAddress to = new InternetAddress(toUser);
      message.setRecipient(Message.RecipientType.TO, to);
      // 郵件標題
      message.setSubject(subject);
      // 郵件內容,也可以使純文本"text/plain"
      message.setContent(messageText, "text/html;charset=GBK");
      message.saveChanges();
      Transport transport = session.getTransport("smtp");
      // smtp驗證，就是你用來發郵件的郵箱用戶名密碼
      transport.connect(smtpHost, userName, fromUserPassword);
      // 發送
      transport.sendMessage(message, message.getAllRecipients());
      transport.close();
      flag = true;
    } catch (AddressException e) {
      log.error("地址異常:{}", e);
      throw e;
    } catch (MessagingException e) {
      log.error("消息異常:{}", e);
      throw e;
    } catch (Exception e) {
      log.error("系統異常:{}", e);
      throw e;
    }

    return flag;
  }
}