java-test case for javamail

Question

这是发送电子邮件的代码：

Properties properties = new Properties();
String host = "XXXXXX";
String from = "XXXXXX";
String to = "XXXXXX";
String content = "xxxxxxxx";
String subject = "xxxxxxxx";
properties.setProperty("mail.smtp.host", host);
Session session = Session.getInstance(properties, null);
Mailbox mailbox = Mailbox.get(to);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipient(RecipientType.TO, new InternetAddress(to));
message.setSubject(subject);
message.setText(content);
session.setDebug(true);
Transport.send(message);

现在我想知道如何从Gmail帐户检索电子邮件并能够阅读它们？我还想知道如何测试我的电子邮件是否成功发送？

以下是调试内容： '

DEBUG: setDebug: JavaMail version 1.3.1
     DEBUG: getProvider() returning            javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
    DEBUG SMTP: useEhlo true, useAuth false
    DEBUG SMTP: trying to connect to host "XXXX", port 25
    220 XXXXX ESMTP Symantec Messaging Gateway
    DEBUG SMTP: connected to host "XXXXX", port: 25
    EHLO XXXXX
    250-XXXXX says EHLO to XXXXX
    250-STARTTLS
    250-8BITMIME
    250-SIZE 262144000
    250-ENHANCEDSTATUSCODES
    250 PIPELINING
    DEBUG SMTP: Found extension "STARTTLS", arg ""
    DEBUG SMTP: Found extension "8BITMIME", arg ""
    DEBUG SMTP: Found extension "SIZE", arg "262144000"
    DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
    DEBUG SMTP: Found extension "PIPELINING", arg ""
    DEBUG SMTP: use8bit false
    MAIL FROM:<xxxxxx>
    250 2.0.0 MAIL FROM accepted
    RCPT TO:<xxxxxxx>
    250 2.0.0 RCPT TO accepted
    DEBUG SMTP: Verified Addresses
    DEBUG SMTP:   xxxxxx
    DATA
    354 3.0.0 continue.  finished with "rn.rn"
    Message-ID: <942986815.1484331504128.JavaMail.XXXXXX>
    From: xxxxxx
    To: xxxxxxx
    Subject: xxxxxxx
    Mime-Version: 1.0
    Content-Type: text/plain; charset=us-ascii
    Content-Transfer-Encoding: 7bit
    xxxxxxx
    .
    250 2.0.0 OK 91/8D-04168-0F919785
    QUIT

'

Answer 1

这是一个类，它定义了从 gmail 收件箱中检索电子邮件的 fetch 方法。

必须添加以下两个库才能编译代码。

1-可以从此处下载的Java激活库 http://www.oracle.com/technetwork/java/javase/downloads/index-135046.html

2-可以从这里下载的java邮件库 https://java.net/projects/javamail/pages/Home

---

  import java.io.BufferedOutputStream;
  import java.io.BufferedReader;
  import java.io.DataOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.Date;
  import java.util.Properties;
  import javax.mail.Address;
  import javax.mail.Folder;
  import javax.mail.Message;
  import javax.mail.MessagingException;
  import javax.mail.Multipart;
  import javax.mail.NoSuchProviderException;
  import javax.mail.Part;
  import javax.mail.Session;
  import javax.mail.Store;
  public class FetchingEmail {
  public static void fetch(String pop3Host, String storeType, String user,
  String password) {
  try {
     // create properties field
     Properties properties = new Properties();
     properties.put("mail.store.protocol", "pop3");
     properties.put("mail.pop3.host", pop3Host);
     properties.put("mail.pop3.port", "995");
     properties.put("mail.pop3.starttls.enable", "true");
     Session emailSession = Session.getDefaultInstance(properties);
     // emailSession.setDebug(true);
     // create the POP3 store object and connect with the pop server
     Store store = emailSession.getStore("pop3s");
     store.connect(pop3Host, 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; i < messages.length; i++) {
        Message message = messages[i];
       //now over here you can process the message object in any way you like
     }
     // close the store and folder objects
     emailFolder.close(false);
     store.close();
  } catch (NoSuchProviderException e) {
     e.printStackTrace();
  } catch (MessagingException e) {
     e.printStackTrace();
  } catch (IOException e) {
     e.printStackTrace();
  } catch (Exception e) {
     e.printStackTrace();
  }
 }
}

现在您已经有了这个类 - 在 for 循环中添加代码，以您想要的方式处理每条消息。然后调用 fetch 方法，如下所示fetch("pop.gmail.com", "pop3", username, password);