从Gmail读取电子邮件不起作用 [英] Reading email from gmail is not working

问题描述

我正在使用Java Mail API以及以下代码从我的Gmail帐户中读取电子邮件。

I am using Java Mail API along with the following code to read email from my gmail account.

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 = "[e-mail]";// change accordingly
      String password = "*******";// change accordingly

      check(host, mailStoreType, username, password);

   }

}

但是我得到以下异常：

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)

但是我收到了我的收件箱中的Gmail的电子邮件，
我们最近阻止了您的Google帐户尝试登录。
如何使程序正常工作？

But i have recieved an email from gmail in my inbox which is saying that "We recently blocked-in a sign in attempt to your Google Account". How can i make the program to work properly?

推荐答案

更改您的 emailSession 变量与

Change Your emailSession variable with

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

如Gmail所述

某些应用和设备使用较少安全的登录技术，这使得
您的帐户更容易受到攻击。您可以关闭这些应用程序的访问权限，我们建议您使用
，或者如果您想使用这些应用程序，则可以启用访问，尽管
的风险。了解详情

Some apps and devices use less secure sign-in technology, which makes your account more vulnerable. You can turn off access for these apps, which we recommend, or turn on access if you want to use them despite the risks. Learn more

只需点击下面的链接并禁用Gmail安全设置即可。

Just click below link and disable Gmail security settings.It will work.

停用安全性设置

这是一篇很好的文章，关于 Java Mail Api中的密码验证

Here is a nice article about Password Authentication in Java Mail Api

这篇关于从Gmail读取电子邮件不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！