yii2如何实现使用qq邮箱发送文件

'mailer' => [             'class' => 'yiiswiftmailerMailer',             'viewPath' => '@common/mail',             // send all mails to a file by default. You have to set             // 'useFileTransport' to false and configure a transport             // for the mailer to send real emails.             'useFileTransport' => false,             'transport' => [                 //这里如果你是qq的邮箱，可以参考qq客户端设置后再进行配置 http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=28&&no=1001256                 'class' => 'Swift_SmtpTransport',                 'host' => 'smtp.qq.com',                 // qq邮箱                 'username' => '114***6@qq.com',                 //授权码, 什么是授权码， http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=28&&no=1001256                 'password' => '***',                  'port' => '465',                 'encryption' => 'ssl',              ],             'messageConfig'=>[                 'charset'=>'UTF-8',                 'from'=>['114***@qq.com'=>'developer']             ],         ],

public function actionSendmail()     {         $mail = YII::$app->mailer->compose();         $mail->setTo("***@qq.com");         $mail->setSubject("邮件测试");         $mail->setTextBody("textbody 25 ok?");//发布纯文字文本         //$mail->setHtmlBody("htmlbody");//发布可以带html标签的文本         if($mail->send()){             echo "success";         }else{             echo "failure";         }     }