Merge pull request #11467 from hkhan/JAVA-8383-fix-email-code

[JAVA-8383] Add charset to email mime type to handle special chars

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/mail/EmailService.java

@@ -1,40 +1,55 @@
 package com.baeldung.mail;
 
-import javax.mail.*;
+import javax.mail.Authenticator;
+import javax.mail.Message;
+import javax.mail.Multipart;
+import javax.mail.PasswordAuthentication;
+import javax.mail.Session;
+import javax.mail.Transport;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeBodyPart;
 import javax.mail.internet.MimeMessage;
 import javax.mail.internet.MimeMultipart;
 import java.io.File;
+import java.net.URI;
 import java.util.Properties;
 
 public class EmailService {
 
-    private String host = "";
+    private String username;
-    private int port = 0;
+    private String password;
-    private String username = "";
-    private String password = "";
 
+    private final Properties prop;
 
     public EmailService(String host, int port, String username, String password) {
-
+        prop = new Properties();
-        this.host = host;
-        this.port = port;
-        this.username = username;
-        this.password = password;
-
-        sendMail();
-    }
-
-    private void sendMail() {
-
-        Properties prop = new Properties();
         prop.put("mail.smtp.auth", true);
         prop.put("mail.smtp.starttls.enable", "true");
         prop.put("mail.smtp.host", host);
         prop.put("mail.smtp.port", port);
         prop.put("mail.smtp.ssl.trust", host);
 
+        this.username = username;
+        this.password = password;
+    }
+
+    public EmailService(String host, int port) {
+        prop = new Properties();
+        prop.put("mail.smtp.host", host);
+        prop.put("mail.smtp.port", port);
+    }
+
+    public static void main(String... args) {
+        try {
+            new EmailService("smtp.mailtrap.io", 25, "87ba3d9555fae8", "91cb4379af43ed")
+              .sendMail();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void sendMail() throws Exception {
+
         Session session = Session.getInstance(prop, new Authenticator() {
             @Override
             protected PasswordAuthentication getPasswordAuthentication() {
@@ -42,8 +57,6 @@ public class EmailService {
             }
         });
 
-        try {
-
         Message message = new MimeMessage(session);
         message.setFrom(new InternetAddress("from@gmail.com"));
         message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("to@gmail.com"));
@@ -52,10 +65,11 @@ public class EmailService {
         String msg = "This is my first email using JavaMailer";
 
         MimeBodyPart mimeBodyPart = new MimeBodyPart();
-                mimeBodyPart.setContent(msg, "text/html");
+        mimeBodyPart.setContent(msg, "text/html; charset=utf-8");
 
         MimeBodyPart attachmentBodyPart = new MimeBodyPart();
-                attachmentBodyPart.attachFile(new File("pom.xml"));
+
+        attachmentBodyPart.attachFile(getFile());
 
         Multipart multipart = new MimeMultipart();
         multipart.addBodyPart(mimeBodyPart);
@@ -64,14 +78,14 @@ public class EmailService {
         message.setContent(multipart);
 
         Transport.send(message);
-
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
     }
 
-    public static void main(String ... args) {
+    private File getFile() throws Exception {
-        new EmailService("smtp.mailtrap.io", 25, "87ba3d9555fae8", "91cb4379af43ed");
+        URI uri = this.getClass()
+          .getClassLoader()
+          .getResource("attachment.txt")
+          .toURI();
+        return new File(uri);
     }
 
 }

core-java-modules/core-java-networking-2/src/main/resources/attachment.txt

@@ -0,0 +1 @@
+sample attachment content

core-java-modules/core-java-networking-2/src/test/java/com/baeldung/mail/EmailServiceLiveTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.mail;
+
+import com.icegreen.greenmail.junit.GreenMailRule;
+import com.icegreen.greenmail.util.ServerSetupTest;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+
+import javax.mail.MessagingException;
+import javax.mail.internet.MimeMessage;
+import javax.mail.internet.MimeMultipart;
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+
+public class EmailServiceLiveTest {
+
+    @Rule
+    public final GreenMailRule greenMail = new GreenMailRule(ServerSetupTest.SMTP);
+
+    private EmailService emailService;
+
+    @Before
+    public void setup() {
+        emailService = new EmailService("localhost", greenMail.getSmtp().getPort());
+    }
+
+    @Test
+    public void givenEmailMessageWithAttachment_whenEmailIsSent_MessageIsReceived() throws Exception {
+
+        emailService.sendMail();
+
+        MimeMessage[] receivedMessages = greenMail.getReceivedMessages();
+        assertEquals(1, receivedMessages.length);
+
+        MimeMessage receivedMessage = receivedMessages[0];
+        assertEquals("Mail Subject", subjectFromMessage(receivedMessage));
+        assertEquals("This is my first email using JavaMailer", emailTextFrom(receivedMessage));
+        assertEquals("sample attachment content", attachmentContentsFrom(receivedMessage));
+    }
+
+    private static String subjectFromMessage(MimeMessage receivedMessage) throws MessagingException {
+        return receivedMessage.getSubject();
+    }
+
+    private static String emailTextFrom(MimeMessage receivedMessage) throws IOException, MessagingException {
+        return ((MimeMultipart) receivedMessage.getContent())
+          .getBodyPart(0)
+          .getContent()
+          .toString();
+    }
+
+    private static String attachmentContentsFrom(MimeMessage receivedMessage) throws Exception {
+        return ((MimeMultipart) receivedMessage.getContent())
+          .getBodyPart(1)
+          .getContent()
+          .toString();
+    }
+
+}