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* https://jira.baeldung.com/browse/BAEL-8313 * https://jira.baeldung.com/browse/BAEL-8313
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-17
lines changed

4 files changed

+182
-17
lines changed

‎core-java-modules/core-java-networking-6/pom.xml

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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-web</artifactId>
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<version>${springframework.spring-web.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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<version>${webflux.version}</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-webflux</artifactId>
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<artifactId>async-http-client</artifactId>
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<version>${async-http-client.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${commons-lang3.version}</version>
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</dependency>
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<dependency>
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<groupId>com.squareup.okhttp3</groupId>
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<artifactId>okhttp</artifactId>
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<artifactId>commons-net</artifactId>
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<version>${commons-net.version}</version>
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</dependency>
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<dependency>
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<groupId>org.eclipse.angus</groupId>
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<artifactId>angus-mail</artifactId>
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<version>${angus-mail.version}</version>
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</dependency>
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<dependency>
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<groupId>com.icegreen</groupId>
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<artifactId>greenmail</artifactId>
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<version>${greenmail.version}</version>
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</dependency>
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<dependency>
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<groupId>org.wiremock</groupId>
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<artifactId>wiremock</artifactId>
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<build>
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<finalName>core-java-networking-6</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>21</source>
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<target>21</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
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<apache.httpclient.version>4.5.14</apache.httpclient.version>
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<greenmail.version>2.0.0-alpha-3</greenmail.version>
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<apache.httpclient5.version>5.3.1</apache.httpclient5.version>
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<async-http-client.version>2.4.5</async-http-client.version>
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<jakarta.bind.version>2.3.3</jakarta.bind.version>
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<apache.httpclient5.version>5.4.2</apache.httpclient5.version>
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<okhttp.version>4.12.0</okhttp.version>
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<webflux.version>3.4.3</webflux.version>
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<commons-net.version>3.8.0</commons-net.version>
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<angus-mail.version>2.0.3</angus-mail.version>
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<greenmail.version>2.1.3</greenmail.version>
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<wiremock.version>3.13.0</wiremock.version>
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</properties>
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‎core-java-modules/core-java-networking-6/src/main/java/com/baeldung/inlineimagesinemail/InlineImage.java

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package com.baeldung.inlineimagesinemail;
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import java.io.File;
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import java.io.IOException;
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import java.util.Properties;
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import jakarta.mail.Authenticator;
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import jakarta.mail.Message;
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import jakarta.mail.MessagingException;
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import jakarta.mail.PasswordAuthentication;
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import jakarta.mail.Session;
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import jakarta.mail.Transport;
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import jakarta.mail.internet.InternetAddress;
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import jakarta.mail.internet.MimeBodyPart;
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import jakarta.mail.internet.MimeMessage;
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import jakarta.mail.internet.MimeMultipart;
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import com.icegreen.greenmail.util.GreenMail;
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public class InlineImage {
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private final String USERNAME = "YOUR_SMTP_USERNAME";
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private final String PASSWORD = "YOUR_SMTP_PASSWORD";
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private final String HOST = "SMTP HOST";
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private final String PORT = "SMTP PORT";
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public Properties smtpProperties() {
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Properties prop = new Properties();
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prop.put("mail.smtp.auth", "true");
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prop.put("mail.smtp.starttls.enable", "true");
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prop.put("mail.smtp.host", HOST);
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prop.put("mail.smtp.port", PORT);
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prop.put("mail.smtp.user", USERNAME);
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prop.put("mail.smtp.password", PASSWORD);
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return prop;
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}
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public Session smtpsession(Properties props) {
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final String username = props.getProperty("mail.smtp.user");
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final String password = props.getProperty("mail.smtp.password");
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Session session = Session.getInstance(props, new Authenticator() {
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@Override
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protected PasswordAuthentication getPasswordAuthentication() {
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return new PasswordAuthentication(username, password);
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}
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});
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return session;
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}
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public Session smtpsession(GreenMail greenMail) {
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Session session = greenMail.getSmtp()
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.createSession();
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return session;
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}
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public void sendEmail(Session session, String to, String subject, String body, String filePath) throws MessagingException, IOException {
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MimeMessage message = new MimeMessage(session);
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message.setFrom(new InternetAddress("[email protected]"));
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message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
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message.setSubject(subject);
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MimeBodyPart htmlPart = new MimeBodyPart();
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htmlPart.setContent(body, "text/html");
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MimeBodyPart imagePart = new MimeBodyPart();
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imagePart.attachFile(new File(filePath));
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imagePart.setContentID("<image1>");
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imagePart.setDisposition(MimeBodyPart.INLINE);
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MimeMultipart mimeMultipart = new MimeMultipart("related");
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mimeMultipart.addBodyPart(htmlPart);
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mimeMultipart.addBodyPart(imagePart);
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message.setContent(mimeMultipart);
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Transport.send(message);
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}
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public static void main(String[] args) throws MessagingException, IOException {
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InlineImage inlineImage = new InlineImage();
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Properties properties = inlineImage.smtpProperties();
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Session session = inlineImage.smtpsession(properties);
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String to = "[email protected]";
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String subject = "Baeldung";
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String body = """
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<p>Welcome to Baeldung, home of Java and its frameworks.</p>
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<img src='cid:image1'></img>
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<p> Explore and learn. </p>
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""";
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String imagePath = "src/main/resources/image/java.png";
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inlineImage.sendEmail(session, to, subject, body, imagePath);
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}
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}

‎core-java-modules/core-java-networking-6/src/main/resources/image/java.png

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‎core-java-modules/core-java-networking-6/src/test/java/com/baeldung/inlineimagesinemail/InlineImageUnitTest.java

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package com.baeldung.inlineimagesinemail;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import jakarta.mail.BodyPart;
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import jakarta.mail.Multipart;
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import jakarta.mail.Part;
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import jakarta.mail.Session;
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import jakarta.mail.internet.MimeMessage;
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import org.junit.jupiter.api.Test;
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import com.icegreen.greenmail.util.GreenMail;
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import com.icegreen.greenmail.util.ServerSetupTest;
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class InlineImageUnitTest {
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@Test
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void givenHtmlEmailWithInlineImage_whenSentViaGreenMailSmtp_thenReceivesEmailWithInlineImage() throws Exception {
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GreenMail greenMail = new GreenMail(ServerSetupTest.SMTP);
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greenMail.start();
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InlineImage inlineImage = new InlineImage();
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Session session = inlineImage.smtpsession(greenMail);
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String to = "receiver@localhost";
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String subject = "Test Subject";
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String body = """
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<p>Welcome to Baeldung, home of Java and its frameworks.</p>
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<img src='cid:image1'></img>
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<p> Explore and learn. </p>
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""";
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String imagePath = "src/main/resources/image/java.png";
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inlineImage.sendEmail(session, to, subject, body, imagePath);
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MimeMessage[] receivedMessages = greenMail.getReceivedMessages();
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assertEquals(1, receivedMessages.length);
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MimeMessage message = receivedMessages[0];
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Multipart multipart = (Multipart) message.getContent();
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assertEquals(2, multipart.getCount());
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BodyPart htmlPart = multipart.getBodyPart(0);
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assertTrue(htmlPart.getContentType()
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.contains("text/html"));
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String htmlContent = (String) htmlPart.getContent();
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assertTrue(htmlContent.contains("cid:image1"));
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BodyPart imagePart = multipart.getBodyPart(1);
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String contentId = imagePart.getHeader("Content-ID")[0];
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assertTrue(contentId.contains("image1") || contentId.contains("<image1>"));
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assertEquals(Part.INLINE, imagePart.getDisposition());
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greenMail.stop();
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}
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}

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