Java 通过 gmail 发送电子邮件
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【中文标题】Java 通过 gmail 发送电子邮件【英文标题】:Java Send Email via gmail 【发布时间】:2016-09-26 12:30:29 【问题描述】:以下代码应该通过 gmail 发送电子邮件,但它给出了以下错误:
在我的 gmail 帐户上,我收到一条消息,指出登录被阻止,我应该使用像 gmail 这样的安全应用来访问我的帐户。源码如下图:
public void doSendMail()
username = txtFrom.getText();
password= new String(txtPassword.getPassword());
to = txtTo.getText();
subject = txtSubject.getText();
email_body = jTextArea1.getText();
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "587");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.port", "587");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator()
@Override
protected PasswordAuthentication getPasswordAuthentication()
return new PasswordAuthentication(username, password);
);
try
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(username));
message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
message.setSubject(subject);
message.setText(email_body);
Transport.send(message);
JOptionPane.showMessageDialog(this, "Message Sent!","Sent",JOptionPane.INFORMATION_MESSAGE);
catch (Exception e)
JOptionPane.showMessageDialog(this, e.toString());
我可以对代码做些什么以使其通过 gmail 发送邮件?
【问题讨论】:
能否贴出可以复制的错误信息文本? ***.com/questions/37051208/… 我将 try...catch 块捕获的错误设置为显示在消息对话框中。我相信错误显示在我发布的消息对话框中 【参考方案1】:您的源代码非常适合通过 gmail 发送电子邮件。可能您必须允许您的帐户通过https://www.google.com/settings/security/lesssecureapps
进行不太安全的访问
这是您的代码。我做了很少的修改以作为独立程序运行。它需要两个罐子:1)mail-1.4.7.jar 和 2)activation-1.1.1.jar
import java.util.Properties;
import java.util.Scanner;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.swing.JOptionPane;
/**
* Following jar are required:
* 1) mail-1.4.7.jar from http://central.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar
* 2) activation-1.1.1.jar from http://central.maven.org/maven2/javax/activation/activation/1.1.1/activation-1.1.1.jar
*
*/
public class Test
public static void main(String args[])
Scanner sc = new Scanner(System.in);
System.out.print("gmail username: ");
String username = sc.next();
System.out.print("gmail password: ");
String password = sc.next();
System.out.print("destination email address: ");
String to = sc.next();
System.out.print("subject: ");
String subject = sc.next();
System.out.print("email body: ");
String email_body = sc.next();
Test test = new Test();
test.doSendMail(username, password, to, subject, email_body);
sc.close();
// sends mail
public void doSendMail(final String username, final String password, String to, String subject, String email_body)
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "587");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.port", "587");
Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator()
@Override
protected PasswordAuthentication getPasswordAuthentication()
return new PasswordAuthentication(username, password);
);
try
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(username));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
message.setSubject(subject);
message.setText(email_body);
Transport.send(message);
System.out.println("message sent");
JOptionPane.showMessageDialog(null, "Message Sent!", "Sent", JOptionPane.INFORMATION_MESSAGE);
catch (Exception e)
System.out.println(e);
JOptionPane.showMessageDialog(null, e.toString());
【讨论】:
我倾向于认为这可能是问题所在,但是activation-1.1.1.jar 有什么作用呢? 我使用 javax.swing.mail.jar 版本 1.5.5 在打开不太安全的应用程序后工作。谢谢@Sanjeev Saha 无效:javax.mail.MessagingException:无法连接到 SMTP 主机:smtp.xyz.com,端口:587;嵌套异常是:java.net.ConnectException:连接超时:连接 @ShamimAhmad 你的堆栈跟踪显示你正在使用mail.smtp.host=smtp.xyz.com
,这是错误的!!!你应该使用mail.smtp.host=smtp.gmail.com
。请将您的值与本程序中给出的值进行比较。它应该可以工作。【参考方案2】:
对我来说正在使用这个属性:
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
希望对你有帮助。
【讨论】:
收到同样的信息 OscarBcn 你激活了吗? google.com/settings/security/lesssecureapps 我这样做了,它成功了,这实际上是问题所在,并没有改变我的源代码【参考方案3】:试试这个:
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
public class SendMailSSL
public static void main(String[] args)
String to = "krishna14581@gmail.com";//change accordingly
//Get the session object
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator()
protected PasswordAuthentication getPasswordAuthentication()
return new PasswordAuthentication("yourgmailid@gmail.com", "password");//change accordingly
);
//compose message
try
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress("yourgmailid@gmail.com"));//change accordingly
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
message.setSubject("Hello");
message.setText("Testing.......");
//send message
Transport.send(message);
System.out.println("message sent successfully");
catch (MessagingException e)
throw new RuntimeException(e);
【讨论】:
收到了相同的消息,但当您将主机更改为“smtp.mail.yahoo.com”时,它对 yahoo 有效。 尝试“smtp-relay.gmail.com”作为主机。 我在 google 上打开了安全性较低的应用程序的访问权限,它工作得很好。无需修改代码【参考方案4】:只需转到:https://myaccount.google.com/security 转到页面底部并启用:允许不太安全的应用程序
【讨论】:
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