在Java Web应用程序中发送电子邮件

Question

我正在用Java编写一个webapp。 在此Web应用程序中，我将向用户发送电子邮件。 当我执行应用程序时，我收到一条错误消息。 我在另一个Java程序中使用相同的源代码。 在该程序中，我没有任何错误。

源代码：

public class MailUtil {

public static Session getGMailSession(String user, String pass){
    final Properties props = new Properties();

    //Eigenschaften zum Sende einer Mail mit GMail
    props.setProperty("mail.smtp.host", "smtp.gmail.com");
    props.setProperty("mail.smtp.auth", "true");
    props.setProperty("mail.smtp.port", "465");
    props.setProperty("mail.smtp.socketFactory.port", "465");
    props.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.setProperty("mail.smtp.socketFactory.fallback", "false");

    return Session.getInstance(props, new javax.mail.Authenticator(){
        @Override protected PasswordAuthentication getPasswordAuthentication(){
            return new PasswordAuthentication (props.getProperty("mail.pop3.user"),props.getProperty("mail.pop3.password"));
        }//endof Methode getPasswordAuthentication
    });//endOf getInstance
}//endOf Methode getGMailSession

//Die Methode postMail versendet eine Mail
public static void postMail(String recipient, String subject, String message){
    Session session = MailUtil.getGMailSession("user", "password");

    try{
        Message msg = new MimeMessage(session);
        msg.setSubject(subject);
        msg.setContent(message, "text/plain");
        msg.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
        Transport.send(msg);
    }
    catch(MessagingException e){
        System.out.println("Error in this Method");
        System.out.println("Cause: " +e.getMessage());
        e.printStackTrace();
    }
}
}

这是错误消息：

10:27:50,014 INFO  [stdout] (default task-16) **Error in this Method**
10:27:50,014 INFO  [stdout] (default task-16) Cause: failed to connect, no user name specified?
10:27:50,015 ERROR [stderr] (default task-16) javax.mail.AuthenticationFailedException: failed to connect, no user name specified?
10:27:50,016 ERROR [stderr] (default task-16)   at javax.mail.Service.connect(Service.java:376)
10:27:50,016 ERROR [stderr] (default task-16)   at javax.mail.Service.connect(Service.java:226)
10:27:50,016 ERROR [stderr] (default task-16)   at javax.mail.Service.connect(Service.java:175)
10:27:50,017 ERROR [stderr] (default task-16)   at javax.mail.Transport.send0(Transport.java:253)
10:27:50,017 ERROR [stderr] (default task-16)   at javax.mail.Transport.send(Transport.java:124)
10:27:50,017 ERROR [stderr] (default task-16)   at de.hskl.lernanalyse.utilities.MailUtil.postMail(MailUtil.java:50)
10:27:50,018 ERROR [stderr] (default task-16)   at de.hskl.lernanalyse.controller.TokenGenController.doGeneriereLink(TokenGenController.java:77)
10:27:50,018 ERROR [stderr] (default task-16)   at de.hskl.lernanalyse.controller.TokenGenController.doSendeEmail(TokenGenController.java:108)
10:27:50,018 ERROR [stderr] (default task-16)   at de.hskl.lernanalyse.controller.TokenGenController$Proxy$_$$_WeldClientProxy.doSendeEmail(Unknown Source)
10:27:50,019 ERROR [stderr] (default task-16)   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:27:50,025 ERROR [stderr] (default task-16)   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
10:27:50,025 ERROR [stderr] (default task-16)   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
10:27:50,026 ERROR [stderr] (default task-16)   at java.lang.reflect.Method.invoke(Method.java:606)
10:27:50,026 ERROR [stderr] (default task-16)   at javax.el.ELUtil.invokeMethod(ELUtil.java:308)
10:27:50,026 ERROR [stderr] (default task-16)   at javax.el.BeanELResolver.invoke(BeanELResolver.java:537)
10:27:50,027 ERROR [stderr] (default task-16)   at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
10:27:50,027 ERROR [stderr] (default task-16)   at com.sun.el.parser.AstValue.invoke(AstValue.java:269)
10:27:50,027 ERROR [stderr] (default task-16)   at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
10:27:50,027 ERROR [stderr] (default task-16)   at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
10:27:50,028 ERROR [stderr] (default task-16)   at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
10:27:50,029 ERROR [stderr] (default task-16)   at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
10:27:50,029 ERROR [stderr] (default task-16)   at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
10:27:50,030 ERROR [stderr] (default task-16)   at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
10:27:50,031 ERROR [stderr] (default task-16)   at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
10:27:50,031 ERROR [stderr] (default task-16)   at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
10:27:50,032 ERROR [stderr] (default task-16)   at javax.faces.component.UICommand.broadcast(UICommand.java:315)
10:27:50,032 ERROR [stderr] (default task-16)   at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
10:27:50,033 ERROR [stderr] (default task-16)   at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
10:27:50,033 ERROR [stderr] (default task-16)   at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
10:27:50,034 ERROR [stderr] (default task-16)   at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
10:27:50,035 ERROR [stderr] (default task-16)   at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
10:27:50,035 ERROR [stderr] (default task-16)   at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
10:27:50,035 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
10:27:50,036 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:61)
10:27:50,037 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
10:27:50,037 ERROR [stderr] (default task-16)   at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
10:27:50,038 ERROR [stderr] (default task-16)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25)
10:27:50,039 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:113)
10:27:50,039 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:56)
10:27:50,040 ERROR [stderr] (default task-16)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25)
10:27:50,041 ERROR [stderr] (default task-16)   at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45)
10:27:50,041 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:61)
10:27:50,042 ERROR [stderr] (default task-16)   at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58)
10:27:50,042 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70)
10:27:50,043 ERROR [stderr] (default task-16)   at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76)
10:27:50,043 ERROR [stderr] (default task-16)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25)
10:27:50,045 ERROR [stderr] (default task-16)   at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
10:27:50,045 ERROR [stderr] (default task-16)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25)
10:27:50,053 ERROR [stderr] (default task-16)   at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25)
10:27:50,053 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:240)
10:27:50,054 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:227)
10:27:50,054 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:73)
10:27:50,055 ERROR [stderr] (default task-16)   at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:146)
10:27:50,055 ERROR [stderr] (default task-16)   at io.undertow.server.Connectors.executeRootHandler(Connectors.java:177)
10:27:50,056 ERROR [stderr] (default task-16)   at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:727)
10:27:50,056 ERROR [stderr] (default task-16)   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
10:27:50,056 ERROR [stderr] (default task-16)   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
10:27:50,057 ERROR [stderr] (default task-16)   at java.lang.Thread.run(Thread.java:745)

Answer 1

您错过了，

msg.setFrom(username);

方法，该方法应配置为从您的帐户发送电子邮件。

正如docs所说。

在此消息中设置“发件人”属性。 此属性的值是从属性“ mail.user”获得的。 如果缺少此属性，则使用系统属性“ user.name”。

并阅读此线程JavaMail API，Gmail-Auth和setFrom

Answer 2

首先，解决所有这些常见错误 。

其次， 在Gmail上阅读此JavaMail FAQ条目 。

如果仍然无法正常工作并出现相同的错误，请告诉我们您进行了哪些调试，以证明在连接时指定了用户名。 您可能需要查看这些调试技巧 。