大家好,我刚刚尝试获取一些Java代码,以通过gmail向Java用户发送电子邮件,这就是我所拥有的：

@ManagedBean

@ViewScoped

public class email {

// Set up the SMTP server.

java.util.Properties props = new java.util.Properties();

public void mail() {

System.out.println("Called mail");

props.put(

"mail.smtp.gmail", "smtp.gmail.com");

props.put("mail.smtp.port", "587");

Session session = Session.getDefaultInstance(props, null);

// Construct the message

String to = "cam01342@myport.ac.uk";

String from = "richard.dennis@port.ac.uk";

String subject = "Hello";

Message msg = new MimeMessage(session);

try {

System.out.println("Setting up the email");

msg.setFrom(new InternetAddress(from));

msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to));

System.out.println("here");

msg.setSubject("Print Job");

msg.setText("Hi,

How are you?");

Transport.send(msg);

System.out.println("Sending message"); //does not get to this part

} catch (MessagingException e) {

// Error.

}

}

}

它在运行等时没有错误,我在控制台中没有收到发送消息,而只是Transport.send(msg)阻塞了我做错了什么？ gmail的设置都可以吗？

编辑：

@ManagedBean

@ViewScoped

public class email {

// Set up the SMTP server.

java.util.Properties props = new java.util.Properties();

public void mail() {

System.out.println("Called mail");

String host = "smtp.gmail.com";

String from = "------------";

String pass = "----";

props.put("mail.smtp.starttls.enable", "true"); // added this line

props.put("mail.smtp.host", host);

props.put("mail.smtp.user", from);

props.put("mail.smtp.password", pass);

props.put("mail.smtp.port", "587");

props.put("mail.smtp.auth", "true");

Session session = Session.getDefaultInstance(props, null);

// Construct the message

String to = "--------";

String subject = "Hello";

Message msg = new MimeMessage(session);

try {

System.out.println("Setting up the email");

msg.setFrom(new InternetAddress(from));

msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to));

System.out.println("here");

msg.setSubject("Print Job");

msg.setText("Hi,

How are you?");

Transport.send(msg);

System.out.println("Sending message"); //does not get to this part

} catch (MessagingException e) {

// Error.

}

}

}

编辑：

在提供给我的链接之一中尝试示例：

@ManagedBean

@ViewScoped

public class email {

// Set up the SMTP server.

public void mail() throws MessagingException {

String host = "smtp.gmail.com";

String from = "------------";

String pass = "------";

Properties props = System.getProperties();

props.put("mail.smtp.starttls.enable", "true"); // added this line

props.put("mail.smtp.host", host);

props.put("mail.smtp.user", from);

props.put("mail.smtp.password", pass);

props.put("mail.smtp.port", "587");

props.put("mail.smtp.auth", "true");

String[] to = {"-----------"}; // added this line

Session session = Session.getDefaultInstance(props, null);

MimeMessage message = new MimeMessage(session);

message.setFrom(new InternetAddress(from));

InternetAddress[] toAddress = new InternetAddress[to.length];

// To get the array of addresses

for (int i = 0; i < to.length; i++) { // changed from a while loop

toAddress[i] = new InternetAddress(to[i]);

}

System.out.println(Message.RecipientType.TO);

for (int i = 0; i < toAddress.length; i++) { // changed from a while loop

message.addRecipient(Message.RecipientType.TO, toAddress[i]);

}

message.setSubject("sending in a group");

message.setText("Welcome to JavaMail");

Transport transport = session.getTransport("smtp");

transport.connect(host, from, pass);

transport.sendMessage(message, message.getAllRecipients());

transport.close();

}

}

这抛出了这个错误：

INFO: To

WARNING: #{email.mail()}: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25;

nested exception is:

java.net.ConnectException: Connection timed out: connect

javax.faces.FacesException: #{email.mail()}: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25;

nested exception is:

java.net.ConnectException: Connection timed out: connect

at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)

at javax.faces.component.UICommand.broadcast(UICommand.java:315)

at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)

at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)

at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)

at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)

at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)

at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)

at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)

at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)

at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)

at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)

at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)

at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)

at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)

at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)

at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)

at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)

at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)

at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)

at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)

at com.sun.grizzly.ContextTask.run(ContextTask.java:71)

at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)

at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)

at java.lang.Thread.run(Thread.java:722)

Caused by: javax.faces.el.EvaluationException: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25;

nested exception is:

java.net.ConnectException: Connection timed out: connect

at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)

at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)

... 36 more

Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25;

nested exception is:

java.net.ConnectException: Connection timed out: connect

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)

at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)

at javax.mail.Service.connect(Service.java:295)

at javax.mail.Service.connect(Service.java:176)

at richard.fileupload.email.mail(email.java:101)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:601)

at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:779)

at javax.el.BeanELResolver.invoke(BeanELResolver.java:528)

at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:257)

at com.sun.el.parser.AstValue.invoke(AstValue.java:248)

at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)

at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:39)

at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)

at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)

at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)

... 37 more

Caused by: java.net.ConnectException: Connection timed out: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69)

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:157)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)

at java.net.Socket.connect(Socket.java:579)

at java.net.Socket.connect(Socket.java:528)

at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)

at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)

... 54 more