Table of Contents
1. Loading an .EML file
When saving an email to a file, the resulting file has an eml extension (email files–which are in RFC 822 format). This kind of file can be read and parsed by JavaMail.
import java.util.*; import java.io.*; import javax.mail.*; import javax.mail.internet.*; public class ReadEmail { public static void main(String args[]) throws Exception{ display(new File("C:\\temp\\message.eml")); } public static void display(File emlFile) throws Exception{ Properties props = System.getProperties(); props.put("mail.host", "smtp.dummydomain.com"); props.put("mail.transport.protocol", "smtp"); Session mailSession = Session.getDefaultInstance(props, null); InputStream source = new FileInputStream(emlFile); MimeMessage message = new MimeMessage(mailSession, source); System.out.println("Subject : " + message.getSubject()); System.out.println("From : " + message.getFrom()[0]); System.out.println("--------------"); System.out.println("Body : " + message.getContent()); } }
A typical eml looks like this:
X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 Received: from tomts25-srv.bellnexxia.net (tomts25.bellnexxia.net [209.226.175.188]) by tactika.com (8.9.3/8.9.3) with ESMTP id NAA07621 for <real@rgagnon.com>; Sun, 1 Feb 2004 13:25:33 -0500 (EST) Date: Sun, 01 Feb 2004 13:31:40 -0500 From: real gagnon <real@rgagnon.com> Reply-To: real@rgagnon.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: real@rgagnon.com Subject: Example for HowTo Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-UIDL: oP#!!c]^!!1;-!!T@1"!
Running the above HowTo gives this output:
Subject : Example for HowTo From : real gagnon <real@rgagnon.com> -------------- Body : This is an example for HowTo
2. Saving an email to .EML file
First you connect to the mail server with POP3 or IMAP protocol to retrieve the emails.
... folder = store.getDefaultFolder().getFolder("INBOX"); folder.open(Folder.READ_ONLY); Message[] messages = folder.getMessages(); ... for (int i=0; i < messages.length; ++i) { Message msg = messages[i]; String subject = msg.getSubject(); processSaveToFile(msg, subject); ... } ...
Individual email are represented by the Message class.
private void processSaveToFile (javax.mail.Message msg, String subject) throws MessagingException, IOException { String whereToSave = "c:/temp/ + sanitizeFilename(subject) + ".eml"; logger.info("Sauvegarde vers "+ whereToSave); OutputStream out = new FileOutputStream(new File(whereToSave)); try { msg.writeTo(out); } finally { if (out != null) { out.flush(); out.close(); } } }
Since the subject is used to set the filename, it’s not a bad idea to sanitize it to remove illegal characters.
private static String sanitizeFilename(String name) { return name.replaceAll("[:\\\\/*?|<> \"]", "_"); }
Done! Happy Coding!
Related posts:
@Before vs @BeforeClass vs @BeforeEach vs @BeforeAll
Auditing with JPA, Hibernate, and Spring Data JPA
Hướng dẫn Java Design Pattern – Mediator
Java Program to Implement Maximum Length Chain of Pairs
Java Convenience Factory Methods for Collections
How to Store Duplicate Keys in a Map in Java?
Java Program to Implement Wagner and Fisher Algorithm for online String Matching
Jackson Date
An Introduction to ThreadLocal in Java
Overview of Spring Boot Dev Tools
How to Get All Dates Between Two Dates?
The Modulo Operator in Java
Lập trình hướng đối tượng (OOPs) trong java
Java Program to Implement Affine Cipher
Java Program to Generate a Random UnDirected Graph for a Given Number of Edges
Java Program to Find the Mode in a Data Set
Calling Stored Procedures from Spring Data JPA Repositories
Guide to java.util.concurrent.Future
Java Program to Check if a Given Binary Tree is an AVL Tree or Not
Creating Docker Images with Spring Boot
Removing all Nulls from a List in Java
Java Program to Implement Heap Sort Using Library Functions
HashSet trong java
Introduction to Spring Method Security
DynamoDB in a Spring Boot Application Using Spring Data
Java Program to Perform Search in a BST
Tính kế thừa (Inheritance) trong java
Java Program to Find the Edge Connectivity of a Graph
Guide to Spring Cloud Kubernetes
Java Program to Implement the Schonhage-Strassen Algorithm for Multiplication of Two Numbers
Java Program to Check Multiplicability of Two Matrices
Adding a Newline Character to a String in Java