Question

如果您为emailSenderAddress和emailSenderPassword提供正确的值，则此片段在Netbeans和命令行中以调试模式工作。但是，如果不添加导入DataHandler，则它仅在调试模式下起作用。

public class mailTest {

    // dummy DataHandler to be sure to keep the import !
    private DataHandler dh;

    private void prepareMessage() {
        java.util.Properties props = System.getProperties();
        props.put("mail.smtps.host", "smtp.gmail.com");
        props.put("mail.smtps.auth", "true");
        // simple class derived from Authenticator not relevant for the current discussion
        GMailAuthenticator auth = new GMailAuthenticator(<emailSenderAddress>, <emailSenderPassword>);
        javax.mail.Session session = javax.mail.Session.getInstance(props, auth);

        javax.mail.Message msg = new javax.mail.internet.MimeMessage(session);
        System.out.println("new MimeMessage ok !");

    }

    public static void main(String[] args) {
        mailTest mt = new mailTest();
        mt.prepareMessage();
    }
}

class GMailAuthenticator extends Authenticator {

    String user;
    String pw;

    public GMailAuthenticator(String username, String password) {
        super();
        this.user = username;
        this.pw = password;
    }

    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(user, pw);
    }
}

Answer 1

您使用的是哪个JDK版本？ DataHandler是javax.activation（JavaBeans激活框架，又名JAF）API的一部分，该API包含在JDK 8和更早版本中，但不包含在JDK 11中。无论您是否在程序中显式使用JavaMail，JavaMail都需要JAF。在JDK 11上，您需要将其显式添加到项目中。如果您有Maven项目，则可以在com.sun.activation:javax.activation:1.2.0上添加依赖项。

javamail新的MimeMessage挂起

1 个答案: