Java Mail:没有smtp的提供者

Question

我正在使用JavaMail来做一个简单的应用程序,当它在目录中找到一些文件时发送一封电子邮件.我设法让它在Eclipse中运行.我运行应用程序,它发送的电子邮件没有错误.

但是,当我创建jar并执行它时,它在电子邮件发送部分失败了.它给出了这个例外:

javax.mail.NoSuchProviderException: No provider for smtp
 at javax.mail.Session.getProvider(Session.java:460)
 at javax.mail.Session.getTransport(Session.java:655)
 at javax.mail.Session.getTransport(Session.java:636)
 at main.java.util.MailManager.sendMail(MailManager.java:69)
 at main.java.DownloadsMail.composeAndSendMail(DownloadsMail.java:16)
 at main.java.DownloadsController.checkDownloads(DownloadsController.java:51)
 at main.java.MainDownloadsController.run(MainDownloadsController.java:26)
 at java.lang.Thread.run(Unknown Source)

我在这个方法中使用库:

public static boolean sendMail(String subject, String text) {

    noExceptionsThrown = true;
    try {
        loadProperties();
    } catch (IOException e1) {
        System.out.println("Problem encountered while loading properties");
        e1.printStackTrace();
        noExceptionsThrown = false;
    }

    Properties mailProps = new Properties();

    String host = "mail.smtp.host";
    mailProps.setProperty(host, connectionProps.getProperty(host));

    String tls = "mail.smtp.starttls.enable";
    mailProps.setProperty(tls, connectionProps.getProperty(tls));

    String port = "mail.smtp.port";
    mailProps.setProperty(port, connectionProps.getProperty(port));

    String user = "mail.smtp.user";
    mailProps.setProperty(user, connectionProps.getProperty(user));

    String auth = "mail.smtp.auth";
    mailProps.setProperty(auth, connectionProps.getProperty(auth));

    Session session = Session.getDefaultInstance(mailProps);
    //session.setDebug(true);

    MimeMessage message = new MimeMessage(session);

    try {
        message.setFrom(new InternetAddress(messageProps.getProperty("from")));

        message.addRecipient(Message.RecipientType.TO, new InternetAddress(
                messageProps.getProperty("to")));

        message.setSubject(subject);
        message.setText(text);
        Transport t = session.getTransport("smtp");
        try {
            t.connect(connectionProps.getProperty("user"), passwordProps
                    .getProperty("password"));
            t.sendMessage(message, message.getAllRecipients());
        } catch (Exception e) {
            System.out.println("Error encountered while sending the email");
            e.printStackTrace();
            noExceptionsThrown = false;
        } finally {
            t.close();
        }
    } catch (Exception e) {
        System.out.println("Error encountered while creating the message");
        e.printStackTrace();
        noExceptionsThrown = false;
    }
    return noExceptionsThrown;
}

我从属性文件加载这些值.

mail.smtp.host=smtp.gmail.com

mail.smtp.starttls.enable=true

mail.smtp.port=587

mail.smtp.auth=true

我试图通过ssl://smtp.gmail.com更改主机,端口由465(仅用于尝试不同的东西),但它也不起作用.无论如何,如果它使用原始参数从Eclipse工作正常,我想这些值是正确的,但问题是创建jar.我不太了解创建jar时可能的结果或变化.创建jar时,JavaMail库是否会出错？

你有什么想法？

Answer 1

支持jar:mail.jar和activation.jar不在您的类路径中.构建jar时,需要在类路径中包含这些jar.