Java发送邮件，激活需要时间

Question

我需要使用 Gmail 的 SMTP 和 javax.mail api 发送邮件。我正在使用的相同代码在 Android 中成功运行，如果我将它带到 Java 应用程序或尝试在 Java Web 应用程序中使用它，它就会开始出现麻烦。我花了很多时间试图理解有什么区别，但没办法!我的代码如下:

public class GMailSender extends Authenticator
{

    private final String mailhost;
    private final String password;
    private final Session session;
    private final String user;

    public GMailSender(String username, String password)
    {
        this.mailhost = "smtp.gmail.com";
        this.user = username;
        this.password = password;
        Properties properties = new Properties();
        properties.setProperty("mail.transport.protocol", "smtp");
        properties.setProperty("mail.host", mailhost);
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.socketFactory.port", "465");
        properties.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        properties.put("mail.smtp.debug", "true");
        properties.setProperty("mail.smtp.quitwait", "false");

        System.out.println("Creating session ...");
        session = Session.getInstance(properties, this);
        System.out.println("Session createed ...");
    }

    @Override
    protected PasswordAuthentication getPasswordAuthentication()
    {
        System.out.println("Authintecation ...");
        return new PasswordAuthentication(user, password);
    }

    public synchronized void sendMail(String subject, String dataHandler, String senderAddress, String recepeintAddress)
        throws Exception
    {

        MimeMessage mimemessage;
        mimemessage = new MimeMessage(session);
        DataHandler datahandler = new DataHandler(new ByteArrayDataSource(dataHandler.getBytes(), "text/plain"));
        mimemessage.setSender(new InternetAddress(senderAddress));
        mimemessage.setSubject(subject);
        mimemessage.setDataHandler(datahandler);
        mimemessage.setRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(recepeintAddress));
        System.out.println("Sending ...");
        Transport transport = session.getTransport("smtp");
        transport.send(mimemessage);
        System.out.println("Sent!");
    }

    static {

        Security.addProvider(new JSSEProvider());
    }


    public static void main(String[] args){
        System.out.println("Starting email ...");
        GMailSender sender = new GMailSender("myEmail@gmail.com", "my password");
        try {
            sender.sendMail("Test", "alot of data", "myEmail@gmail.com", "someonesemail@gmail.com");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}


public final class JSSEProvider extends Provider {
    private static final long serialVersionUID = 1L;

    public JSSEProvider() {
        super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
        AccessController
                .doPrivileged(new java.security.PrivilegedAction<Void>() {
                    @Override
                    public Void run() {
                        put("SSLContext.TLS",
                                "org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
                        put("Alg.Alias.SSLContext.TLSv1", "TLS");
                        put("KeyManagerFactory.X509",
                                "org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
                        put("TrustManagerFactory.X509",
                                "org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
                        return null;
                    }
                });
    }
}

当我运行代码时，我得到以下结果:

> Starting email ... 
> Creating session ...
> Session createed ...
> Sending ... 
> Authintecation ...

然后大约需要 10 分钟才能返回以下内容:

> javax.mail.MessagingException: Could not connect to SMTP host:
> smtp.gmail.com, port: 465, response: -1
>         at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1379)
>         at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
>         at javax.mail.Service.connect(Service.java:310)
>         at javax.mail.Service.connect(Service.java:169)
>         at javax.mail.Service.connect(Service.java:118)
>         at javax.mail.Transport.send0(Transport.java:188)
>         at javax.mail.Transport.send(Transport.java:118)
>         at com.srycrm.mail.GMailSender.sendMail(GMailSender.java:66)
>         at org.apache.jsp.send_jsp._jspService(send_jsp.java:85)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>         at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
>         at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
>         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
>         at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

谁能帮帮我!!谢谢。

Answer 1

好的，您正在使用端口 465，因此将 ssl mail.smtp.ssl.enable 启用为 true :

properties.put("mail.smtp.ssl.enable", "true");

如果不起作用，则使用 properties.put("mail.smtp.starttls.enable", "true"); 并将端口更改为 587看看是否有帮助。