java - 与 Java SendMail 相比,VB.NET SmtpClient API 是否受到限制?
问题描述
我创建了一种在 VB.NET 中发送电子邮件的方法:
Imports System.Threading
Imports System.Net.Mail
Imports System.ComponentModel
Module Module1
Dim smtpList As New ArrayList
Dim counter = 0
Private Sub smtpClient_SendCompleted(ByVal sender As Object, ByVal e As AsyncCompletedEventArgs)
System.Diagnostics.Debug.WriteLine("completed!")
System.Console.WriteLine("completed!")
End Sub
Public Function createSmtp() As SmtpClient
Dim smtp = New SmtpClient()
Dim user = "AKAKAKAKAKAKAKAK"
Dim host = "smtp.mailgun.org"
Dim pass = "akakakakakakakakakakakakakakakakakakakak"
smtp.Host = host
smtp.Port = 587
smtp.Credentials = New System.Net.NetworkCredential(user, pass)
smtp.EnableSsl = True
Return smtp
End Function
Public Sub SendEmail(email As String, bodystuff As String, smtp As SmtpClient)
Dim from As New MailAddress("contat@testsitetetete.com", "Info", System.Text.Encoding.UTF8)
Dim [to] As New MailAddress(email)
Dim message As New MailMessage(from, [to])
message.Body = String.Format("The message I want to send is to this <b>contact: {0}{1}</b>", vbCrLf, bodystuff)
message.IsBodyHtml = True
message.BodyEncoding = System.Text.Encoding.UTF8
message.Subject = "Test email subject"
message.SubjectEncoding = System.Text.Encoding.UTF8
message.Priority = MailPriority.High
' Set the method that is called back when the send operation ends.
AddHandler smtp.SendCompleted, AddressOf smtpClient_SendCompleted
smtp.Send(message)
'smtp.SendMailAsync(message)
counter = counter + 1 ' I know its not thread safe, just to get a counter
System.Console.WriteLine("Counter -> " & counter)
End Sub
Public Sub StartEmailRun()
System.Diagnostics.Debug.WriteLine("StartEmailRun")
'Dim smtp = createSmtp()
Try
For i = 0 To 8
Dim thread As New Thread(
Sub()
Dim smtp = createSmtp()
SendEmail("someamail@testemail.com", "email test", createSmtp())
End Sub
)
thread.Start()
Next
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
Sub Main()
System.Diagnostics.Debug.WriteLine("Starting the email sending...")
ThreadPool.SetMinThreads(100, 100) ' just to make sure no thread pool issue or limitation
createSmtp()
StartEmailRun()
Thread.Sleep(300000) ' make the program alive
End Sub
End Module
我在java中创建了同样的方法:
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
public class TestMail
{
public static void main(String[] args) throws AddressException, MessagingException, InterruptedException
{
Properties prop = new Properties();
prop.put("mail.smtp.auth", true);
prop.put("mail.smtp.starttls.enable", "true");
prop.put("mail.smtp.host", "smtp.mailgun.org");
prop.put("mail.smtp.port", "587");
prop.put("mail.smtp.ssl.trust", "smtp.mailgun.org");
Session session = Session.getInstance(prop, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
String username = "akakakakakakakakakak";
String password = "kajdfkjasfkjasdfksjdfksdajfksdfjsdkfjdskfjkW";
return new PasswordAuthentication(username, password);
}
});
final Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("testacount@test.com"));
message.setRecipients(
Message.RecipientType.TO, InternetAddress.parse("atest@test.com"));
message.setSubject("Mail Subject");
String msg = "This is my first email using JavaMailer";
MimeBodyPart mimeBodyPart = new MimeBodyPart();
mimeBodyPart.setContent(msg, "text/html");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(mimeBodyPart);
message.setContent(multipart);
for (int i = 0; i < 8; i++)
{
new Thread(new Runnable() {
public void run() {
try {
Transport.send(message);
} catch (MessagingException e) {
e.printStackTrace();
}
System.out.println("sent...");
}
}).start();
}
while(true)
{
Thread.sleep(1000);
}
}
}
我希望 VB.NET 代码能够同时发送电子邮件,就像 java 一样。
但发送的电子邮件似乎是按顺序发送的。在java中,所有的电子邮件都是同时发送的。
我认为在 VB.Net 代码中发送多封电子邮件有一些限制。
有没有办法在 VB.NET 中同时发送多封电子邮件???
ps 不是在谈论 bbc,因为每封电子邮件都不同。
解决方案
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