큰 이미지가 첨부된 Java MailAPI를 사용하여 이메일을 보내는 방법

게시 됨: 2014-03-17

JavaMail API는 메일 및 메시징 응용 프로그램을 구축하기 위해 플랫폼과 프로토콜에 독립적인 프레임워크를 제공합니다. JavaMail API는 Java SE 플랫폼과 함께 사용하기 위한 선택적 패키지로 제공되며 Java EE 플랫폼에도 포함되어 있습니다. JavaMail 1.4.5 릴리스에는 몇 가지 버그 수정 및 개선 사항이 포함되어 있습니다.

언젠가 나는 Gmail SMTP(TLS 인증)를 사용하여 이메일 보내기에 대한 튜토리얼을 작성했지만 이미지 첨부는 사용하지 않았습니다. Java Tutorial 아래에서는 이메일을 첨부하여 큰 이미지를 보내는 데 도움이 됩니다.

때때로 우리는 이메일 에 이미지를 첨부한 다음 이메일 본문 자체에서 사용하고 싶습니다. 이미지 첨부 파일이 있고 이메일 메시지에도 사용되는 이메일을 많이 보았을 것입니다. 트릭은 다른 첨부 파일과 마찬가지로 이미지 파일을 첨부한 다음 이미지 파일의 Content-ID 헤더를 설정한 다음 <img src='cid:image_id'> 와 함께 이메일 메시지 본문에 동일한 콘텐츠 ID를 사용하는 것입니다.

다음은 간단한 Java 프로그램입니다.

CrunchifyJavaMailWithImageAttachment.java
Java
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package com . crunchify . tutorials ;
 
import java . io . UnsupportedEncodingException ;
import java . util . Date ;
import java . util . Properties ;
 
import javax . activation . DataHandler ;
import javax . activation . DataSource ;
import javax . activation . FileDataSource ;
import javax . mail . Authenticator ;
import javax . mail . BodyPart ;
import javax . mail . Message ;
import javax . mail . MessagingException ;
import javax . mail . Multipart ;
import javax . mail . PasswordAuthentication ;
import javax . mail . Session ;
import javax . mail . Transport ;
import javax . mail . internet . AddressException ;
import javax . mail . internet . InternetAddress ;
import javax . mail . internet . MimeBodyPart ;
import javax . mail . internet . MimeMessage ;
import javax . mail . internet . MimeMultipart ;
 
/**
* @author Crunchify.com
*
*/
 
public class CrunchifyJavaMailWithImageAttachment {
 
     static Properties mailServerProperties ;
     static Session getMailSession ;
     static MimeMessage msg ;
 
     public static void main ( String args [ ] ) throws AddressException , MessagingException {
 
         System . out . println ( "\n1st ===> setup Mail Server Properties.." ) ;
 
         final String sourceEmail = "<Your Gmail Email ID" ; // requires valid Gmail id
         final String password = "Your Gmail Password" ; // correct password for Gmail id
         final String toEmail = "[email protected]" ; // any destination email id
 
         Properties props = new Properties ( ) ;
         props . put ( "mail.smtp.host" , "smtp.gmail.com" ) ;
         props . put ( "mail.smtp.port" , "587" ) ;
         props . put ( "mail.smtp.auth" , "true" ) ;
         props . put ( "mail.smtp.starttls.enable" , "true" ) ;
 
         System . out
                 . println ( "\n2nd ===> create Authenticator object to pass in Session.getInstance argument.." ) ;
 
         Authenticator authentication = new Authenticator ( ) {
             protected PasswordAuthentication getPasswordAuthentication ( ) {
                 return new PasswordAuthentication ( sourceEmail , password ) ;
             }
         } ;
         Session session = Session . getInstance ( props , authentication ) ;
         generateAndSendEmail (
                 session ,
                 toEmail ,
                 "Crunchify's JavaMail API example with Image Attachment" ,
                 "Greetings, <br><br>Test email by Crunchify.com JavaMail API example. Please find here attached Image."
                        + "<br><br> Regards, <br>Crunchify Admin" ) ;
 
     }
 
     public static void generateAndSendEmail ( Session session , String toEmail , String subject ,
             String body ) {
         try {
             System . out . println ( "\n3rd ===> generateAndSendEmail() starts.." ) ;
 
             MimeMessage crunchifyMessage = new MimeMessage ( session ) ;
             crunchifyMessage . addHeader ( "Content-type" , "text/HTML; charset=UTF-8" ) ;
             crunchifyMessage . addHeader ( "format" , "flowed" ) ;
             crunchifyMessage . addHeader ( "Content-Transfer-Encoding" , "8bit" ) ;
 
             crunchifyMessage . setFrom ( new InternetAddress ( "[email protected]" ,
                     "NoReply-Crunchify" ) ) ;
             crunchifyMessage . setReplyTo ( InternetAddress . parse ( "[email protected]" , false ) ) ;
             crunchifyMessage . setSubject ( subject , "UTF-8" ) ;
             crunchifyMessage . setSentDate ( new Date ( ) ) ;
             crunchifyMessage . setRecipients ( Message . RecipientType . TO ,
                     InternetAddress . parse ( toEmail , false ) ) ;
 
             // Create the message body part
             BodyPart messageBodyPart = new MimeBodyPart ( ) ;
             messageBodyPart . setContent ( body , "text/html" ) ;
 
             // Create a multipart message for attachment
             Multipart multipart = new MimeMultipart ( ) ;
 
             // Set text message part
             multipart . addBodyPart ( messageBodyPart ) ;
 
             messageBodyPart = new MimeBodyPart ( ) ;
 
             // Valid file location
             String filename = "/Users/<username>//cdn.crunchify.com/Desktop/JavaMailAPIwithImage-CrunchifyExample.png" ;
             DataSource source = new FileDataSource ( filename ) ;
             messageBodyPart . setDataHandler ( new DataHandler ( source ) ) ;
             messageBodyPart . setFileName ( filename ) ;
             // Trick is to add the content-id header here
             messageBodyPart . setHeader ( "Content-ID" , "image_id" ) ;
             multipart . addBodyPart ( messageBodyPart ) ;
 
             System . out . println ( "\n4th ===> third part for displaying image in the email body.." ) ;
             messageBodyPart = new MimeBodyPart ( ) ;
             messageBodyPart . setContent ( "<br><h3>Find below attached image</h3>"
                    + "<img src='cid:image_id'>" , "text/html" ) ;
             multipart . addBodyPart ( messageBodyPart ) ;
             crunchifyMessage . setContent ( multipart ) ;
 
             System . out . println ( "\n5th ===> Finally Send message.." ) ;
 
             // Finally Send message
             Transport . send ( crunchifyMessage ) ;
 
             System . out
                     . println ( "\n6th ===> Email Sent Successfully With Image Attachment. Check your email now.." ) ;
             System . out . println ( "\n7th ===> generateAndSendEmail() ends.." ) ;
 
         } catch ( MessagingException e ) {
             e . printStackTrace ( ) ;
         } catch ( UnsupportedEncodingException e ) {
             e . printStackTrace ( ) ;
         }
     }
}

산출:

Output
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1st === > setup Mail Server Properties . .
 
2nd === > create Authenticator object to pass in Session . getInstance argument . .
 
3rd === > generateAndSendEmail ( ) starts . .
 
4th === > third part for displaying image in the email body . .
 
5th === > Finally Send message . .
 
6th === > Email Sent Successfully With Image Attachment . Check your email now . .
 
7th === > generateAndSendEmail ( ) ends . .

예시 스크린샷:

JavaMailAPIwithImage - Crunchify 예제