The type javax.mail.Authenticator cannot be resolved

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引入如下代码时报错：
        Email email = new SimpleEmail();
        email.setHostName("smtp.googlemail.com");
        email.setSmtpPort(465);
        email.setAuthenticator(new DefaultAuthenticator("username", "password"));
        email.setSSLOnConnect(true);
        email.setFrom("[email protected]");
        email.setSubject("TestMail");
        email.setMsg("This is a test mail ... :-)");
        email.addTo("[email protected]");
        email.send();


报错信息：The type javax.mail.Authenticator cannot be resolved