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In the previous chapters Checking Emails and Fetching Emails, we passed authorization credentials (user ad password) along with host, when connecting to store of your mailbox. Instead we can configure the Properties to have the host, and tell the Session about your custom Authenticator instance. This is shown in the example below:
Create Java Class
We will modify our CheckingMails.java from the chapter Checking Emails. Its contents are as below:
package com.tutorialspoint; import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Folder; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.NoSuchProviderException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Store; public class CheckingMails { public static void check(String host, String storeType, String user, String password) { try { // create properties field Properties properties = new Properties(); properties.put("mail.pop3s.host", host); properties.put("mail.pop3s.port", "995"); properties.put("mail.pop3s.starttls.enable", "true"); // Setup authentication, get session Session emailSession = Session.getInstance(properties, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication( "[email protected]", "manisha123"); } }); // emailSession.setDebug(true); // create the POP3 store object and connect with the pop server Store store = emailSession.getStore("pop3s"); store.connect(); // 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 = "[email protected]";// change accordingly String password = "*****";// change accordingly check(host, mailStoreType, username, password); } }
You can set the debug on by uncommenting the statement emailSession.setDebug(true);
Compile and Run
Now that our class is ready, let us compile the above class. I”ve saved the class CheckingMails.java to directory : /home/manisha/JavaMailAPIExercise. We would need the jars javax.mail.jar and activation.jar in the classpath. Execute the command below to compile the class (both the jars are placed in /home/manisha/ directory) from command prompt:
javac -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: CheckingMails.java
Now that the class is compiled, execute the below command to run:
java -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: CheckingMails
Verify Output
You can see a similar message as below on the command console:
messages.length---3 --------------------------------- Email Number 1 Subject: Today is a nice day From: XYZ <[email protected]> Text: javax.mail.internet.MimeMultipart@45f676cb --------------------------------- Email Number 2 Subject: hiiii.... From: XYZ <[email protected]> Text: javax.mail.internet.MimeMultipart@37f12d4f --------------------------------- Email Number 3 Subject: helloo From: XYZ <[email protected]> Text: javax.mail.internet.MimeMultipart@3ad5ba3a
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