public class SendEmail {      private static final String TAG = "SendEmail";      //要发送Email地址      private String mailTo = null;      //邮件发送来源地址      private String mailFrom = null;      //SMTP主机地址      private String smtpHost = null;      //是否启用调试      private boolean debug = false;        private String messageBasePath = null;      //Email主题      private String subject;        public void setMailTo(String mailTo) {          this.mailTo = mailTo;      }        public void setMailFrom(String mailFrom) {          this.mailFrom = mailFrom;      }        public void setSmtpHost(String smtpHost) {          this.smtpHost = smtpHost;      }        public void setDebug(boolean debug) {          this.debug = debug;      }        public void setMessageBasePath(String messageBasePath) {          this.messageBasePath = messageBasePath;      }        public void setSubject(String subject) {          this.subject = subject;      }        public void setMsgContent(String msgContent) {          this.msgContent = msgContent;      }        public void setAttachedFileList(Vector attachedFileList) {          this.attachedFileList = attachedFileList;      }        public void setEmailAccount(String emailAccount) {          this.emailAccount = emailAccount;      }        public void setEmailPwd(String emailPwd) {          this.emailPwd = emailPwd;      }        public void setMessageContentType(String messageContentType) {          this.messageContentType = messageContentType;      }        public void setEmailbccTo(String emailbccTo) {          this.emailbccTo = emailbccTo;      }        public void setEmailccTo(String emailccTo) {          this.emailccTo = emailccTo;      }        //Email内容      private String msgContent;        private Vector attachedFileList;      private String emailAccount = null;      private String emailPwd = null;      private String messageContentType = "text/html;charset=utf-8";        private String emailbccTo = null;      private String emailccTo = null;        /*      默认构造函数       */      public SendEmail() {          super();      }        private void writeEmail(Session session, Message message) throws MessagingException {          String fileName;          Multipart multipart = new MimeMultipart();          //设定发件人地址          if (mailFrom != null) {              message.setFrom(new InternetAddress(mailFrom));              Log.i(TAG, "发件人邮件地址：" + mailFrom);          } else {              Log.i(TAG, "没有指定发件人邮件地址");              return;          }          //设定收件人地址          if (mailTo != null) {              message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));              Log.i(TAG, "收件人邮件地址：" + mailTo);          } else {              Log.i(TAG, "没有指定收件人邮件地址");              return;          }          //设定抄送地址          if (emailccTo != null) {              message.setRecipient(Message.RecipientType.CC, new InternetAddress(emailccTo));              Log.i(TAG, "抄送邮件地址：" + emailccTo);          } else {              Log.i(TAG, "没有指定抄送邮件地址");              return;          }          //设定密送地址          if (emailbccTo != null) {              message.setRecipient(Message.RecipientType.BCC, new InternetAddress(emailbccTo));              Log.i(TAG, "密送邮件地址：" + emailbccTo);          } else {              Log.i(TAG, "没有指定密送邮件地址");              return;          }          //设置邮件主题          message.setSubject(subject);          Log.i(TAG, "邮件主题:" + subject);          //设置回复地址          message.setReplyTo(new InternetAddress[]{new InternetAddress(mailFrom)});          //创建并设置第一部分          MimeBodyPart bodyPart = new MimeBodyPart();          if (msgContent != null) {              Log.i(TAG, "邮件内容:" + msgContent);              bodyPart.setContent(msgContent, messageContentType);          } else {              bodyPart.setContent("", messageContentType);          }          multipart.addBodyPart(bodyPart);          //附件文件到邮件中          if (attachedFileList != null) {              for (Enumeration fileList = attachedFileList.elements(); fileList.hasMoreElements(); ) {                  fileName = (String) fileList.nextElement();                  MimeBodyPart mBodyPart = new MimeBodyPart();                    FileDataSource fds = new FileDataSource(messageBasePath + fileName);                  Log.i(TAG, "Email发送的附件为:" + messageBasePath + fileName);                  mBodyPart.setDataHandler(new DataHandler(fds));                  mBodyPart.setFileName(fileName);                  multipart.addBodyPart(mBodyPart);              }          }          Log.i(TAG, "设置邮件部分");          message.setContent(multipart);          message.setSentDate(new Date());      }        /**       * 发送邮件方法       *       * @return true 表示发送成功,false表示不成功       */      public boolean sendEmail() {          int loopCount;          Properties properties = System.getProperties();          properties.setProperty("mail.smtp.host", smtpHost);          properties.setProperty("mail.smtp.auth", "true");          properties.put("mail.smtp.port", "25");          MailAuthenticator authenticator = new MailAuthenticator();          Session session = Session.getInstance(properties, authenticator);          session.setDebug(debug);          MimeMessage mimeMessage = new MimeMessage(session);    //这里如果用Transport的话会出现错误          SMTPTransport transport = new SMTPTransport(session, new URLName("smtp", "smtp.qq.com", 25, null, MailAuthenticator.TENCENT_EMAIL_USER, MailAuthenticator.TENCENT_EMAIL_PWD));          try {              writeEmail(session, mimeMessage);              //transport = session.getTransport("smtp");              try {                  Log.i(TAG, "开始连接服务器");                  transport.connect(smtpHost, 25, MailAuthenticator.TENCENT_EMAIL_USER, MailAuthenticator.TENCENT_EMAIL_PWD);              } catch (AuthenticationFailedException e) {                  e.printStackTrace();                  Log.i(TAG, "连接服务器失败");                  return false;              } catch (MessagingException e) {                  e.printStackTrace();                  Log.i(TAG, "发送邮件过程中出现错误");                  return false;              }              Log.i(TAG, "开始发送邮件");              transport.sendMessage(mimeMessage, mimeMessage.getAllRecipients());              transport.close();              Log.i(TAG, "关闭连接");          } catch (MessagingException e) {              e.printStackTrace();              Log.i(TAG, "发送邮件失败");              return false;          } finally {              try {                  if (transport != null && transport.isConnected()) {                      transport.close();                      Log.i(TAG, "在finally中关闭连接");                  }              } catch (MessagingException e) {                  e.printStackTrace();              }          }          Log.i(TAG, "邮件发送成功");          return true;      }  }    tips---其中的MyAuthenticator类继承自Authenticator,重写这个方法即可    @Override  protected PasswordAuthentication getPasswordAuthentication() {      return new PasswordAuthentication(邮箱用户名,密码);  }