[英]Mail service GAE issue - sending mail exception “javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;”
[英]Sending mail error, javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
这是我的代码
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MailSendClass {
public static void main (String [] args){
// Recipient's email ID needs to be mentioned.
String to = "abc82@gmail.com";
// Sender's email ID needs to be mentioned
String from = "xyz@gmail.com";
// Assuming you are sending email from localhost
String host = "localhost";
// Get system properties
Properties properties = System.getProperties();
// Setup mail server
properties.setProperty("mail.smtp.host", host);
// Get the default Session object.
Session session = Session.getDefaultInstance(properties);
try{
// Create a default MimeMessage object.
MimeMessage message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress(from));
// Set To: header field of the header.
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
// Set Subject: header field
message.setSubject("Thanks for registering on our website!");
// Now set the actual message
message.setText("Welcome To Job Portal !!!! Again Thanks ");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
mex.printStackTrace();
}
}
}
我每次都会收到这个错误
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1706)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:525)
at javax.mail.Service.connect(Service.java:291)
at javax.mail.Service.connect(Service.java:172)
at javax.mail.Service.connect(Service.java:121)
at javax.mail.Transport.send0(Transport.java:190)
at javax.mail.Transport.send(Transport.java:120)
at MailSendClass.main(MailSendClass.java:58)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:284)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:227)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1672)
... 7 more
BUILD SUCCESSFUL (total time: 3 seconds)
我没有收到为什么会发生这种情况的错误。 请帮助我修复此错误。
错误是自我解释的: javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
您在本地主机上没有SMTP服务器,但您在那里配置它:
// Assuming you are sending email from localhost
String host = "localhost";
...
// Setup mail server
properties.setProperty("mail.smtp.host", host);
所以你必须:
您应该使用免费的 Google SMTP 服务器作为测试。
mail.host=smtp.gmail.com
mail.username=//your gmail
mail.password=//your password
mail.defaultEncoding=UTF-8
mail.smtp.auth=true
mail.smtp.starttls.required=true
mail.smtp.starttls.enable=true
mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
mail.smtp.socketFactory.fallback=false
mail.smtp.port=465
mail.smtp.socketFactory.port=465
接下来,使用您的 gmail 登录,并打开安全性较低的应用程序。
这是工作解决方案兄弟。 这是有保证的
1)首先打开您要从中发送邮件的gmail帐户,例如“”xyz@gmail.com”
2) 打开以下链接https://support.google.com/accounts/answer/6010255?hl=en
3) 单击“转到我的帐户中的“安全性较低的应用程序”部分。” 选项
4)然后打开它
5)就是这样(:
你应该看看这两行:
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
Caused by: java.net.ConnectException: Connection refused: connect
错误是:“没有任何东西在 localhost 的 25 端口上侦听”。
您正在尝试使用 localhost:25 作为邮件服务器,但那里没有服务器。
只需使用此提供的解决方案: javax.mail.MessagingException:无法连接到 SMTP 主机:本地主机,端口:25
并确保在您的谷歌帐户上打开安全性较低的应用程序访问。
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