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Receiving email in Java

Receiving email using JavaMail API
Steps for receiving the email using JavaMail API
Example of Receiving email using JavaMail API

For receiving email Store and Folder classes are used in collaboration with MimeMessage, Session and Transport classes.

For better understanding of this example, learn the steps of sending email using JavaMail API first.

For sending the email using JavaMail API, you need to load the two jar files:

mail.jar
activation.jar

download these jar files (or) go to the Oracle site to download the latest version.

Steps for receiving the email using JavaMail API

There are 5 steps to receive the email using JavaMail API. They are:

Get the session object
create the POP3 store object and connect with the pop server
create the folder object and open it
retrieve the messages from the folder in an array and print it
close the store and folder objects

Example of Receiving email in Java

Let's see the example of receiving the mail using java mail api.

import java.io.IOException;
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 com.sun.mail.pop3.POP3Store;

public class ReceiveMail{

 public static void receiveEmail(String pop3Host, String storeType,
  String user, String password) {
  try {
   //1) get the session object
   Properties properties = new Properties();
   properties.put("mail.pop3.host", pop3Host);
   Session emailSession = Session.getDefaultInstance(properties);
   
   //2) create the POP3 store object and connect with the pop server
   POP3Store emailStore = (POP3Store) emailSession.getStore(storeType);
   emailStore.connect(user, password);

   //3) create the folder object and open it
   Folder emailFolder = emailStore.getFolder("INBOX");
   emailFolder.open(Folder.READ_ONLY);

   //4) retrieve the messages from the folder in an array and print it
   Message[] messages = emailFolder.getMessages();
   for (int i = 0; i < messages.length; 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());
   }

   //5) close the store and folder objects
   emailFolder.close(false);
   emailStore.close();

  } catch (NoSuchProviderException e) {e.printStackTrace();} 
  catch (MessagingException e) {e.printStackTrace();}
  catch (IOException e) {e.printStackTrace();}
 }

 public static void main(String[] args) {

  String host = "mail.trainingtrains.com";//change accordingly
  String mailStoreType = "pop3";
  String username= "sonoojaiswal@trainingtrains.com";
  String password= "xxxxx";//change accordingly

  receiveEmail(host, mailStoreType, username, password);

 }
}

download this example to receive email

As you can see in the above example, userid and password need to be authenticated. As, this program illustrates, you can receive email easily but change the username and password accordingly. Let's see how to run it once again by simple technique:

Load the jar file	c:\> set classpath=mail.jar;activation.jar;.;
compile the source file	c:\> javac ReceiveMail.java
run by	c:\> java Receivemail

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Java Mail Tutorial

Receiving email in Java

Steps for receiving the email using JavaMail API

Example of Receiving email in Java