Question

我正在使用Java Mail API以及以下代码来阅读我的Gmail帐户中的电子邮件。

import java.util.Properties;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Store;

public class CheckMails {

   public static void check(String host, String storeType, String user,
      String password) 
   {
      try {
      Properties properties = new Properties();

      properties.put("mail.pop3.host", host);
      properties.put("mail.pop3.port", "995");
      properties.put("mail.pop3.starttls.enable", "true");
      Session emailSession = Session.getDefaultInstance(properties);

      //create the POP3 store object and connect with the pop server
      Store store = emailSession.getStore("pop3s");

      store.connect(host, user, password);

      //create the folder object and open it
      Folder emailFolder = store.getFolder("INBOX");
      emailFolder.open(Folder.READ_ONLY);

      // retrieve the messages from the folder in an array and print it
      Message[] messages = emailFolder.getMessages();
      System.out.println("messages.length---" + messages.length);

      for (int i = 0, n = messages.length; i < n; i++) {
         Message message = messages[i];
         System.out.println("---------------------------------");
         System.out.println("Email Number " + (i + 1));
         System.out.println("Subject: " + message.getSubject());
         System.out.println("From: " + message.getFrom()[0]);
         System.out.println("Text: " + message.getContent().toString());

      }

      //close the store and folder objects
      emailFolder.close(false);
      store.close();

      } catch (NoSuchProviderException e) {
         e.printStackTrace();
      } catch (MessagingException e) {
         e.printStackTrace();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
   public static void main(String[] args) {
      String host = "pop.gmail.com";// change accordingly
      String mailStoreType = "pop3";
      String username = "myemai@gmail.com";// change accordingly
      String password = "*******";// change accordingly

      check(host, mailStoreType, username, password);

   }

}

但我得到以下例外情况：

javax.mail.AuthenticationFailedException: [AUTH] Web login required: `    https://support.google.com/mail/bin/answer.py?answer=78754`
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:209)
at javax.mail.Service.connect(Service.java:364)
at javax.mail.Service.connect(Service.java:245)
at CheckMails.check(CheckMails.java:26)
at CheckMails.main(CheckMails.java:66)

但我收到了一封来自我收件箱中的gmail的电子邮件 “我们最近阻止了尝试使用您的Google帐户的行为”。如何使程序正常工作？

Answer 1

使用

更改emailSession变量

Session emailSession = Session.getInstance(props, new javax.mail.Authenticator() {
    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(userName, password);
    }
});

正如Gmail所述

某些应用和设备使用安全性较低的登录技术您的帐户更容易受到攻您可以关闭这些应用的访问权限，我们建议使用，或者如果您想使用它们，请打开访问权限风险。了解更多

只需点击下面的链接即可停用Gmail安全设置。它会正常运行。

Disable Security settings

以下是关于Password Authentication in Java Mail Api

的精彩文章

从gmail阅读电子邮件无效

1 个答案: