How to send mail in spring boot

In Spring Boot, you can send mail using the JavaMailSender interface. Here's a step-by-step guide:

1. Add dependencies

In your pom.xml file (if you're using Maven) or build.gradle file (if you're using Gradle), add the following dependencies:

<!-- Maven -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

<!-- Gradle -->
dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-mail'
}

2. Configure mail settings

Create a application.properties file (or application.yml if you prefer YAML) and add the following settings:

spring:
  mail:
    host: your-mail-host
    port: 587
    username: your-mail-username
    password: your-mail-password
    protocol: smtp
    default-encoding: UTF-8

Replace your-mail-host, your-mail-username, and your-mail-password with your actual mail server settings.

3. Create a JavaMailSender instance

In your Spring Boot application, create a JavaMailSender instance:

import org.springframework.boot.autoconfigure.mail.MailProperties;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;

@Configuration
public class MailConfig {
    @Bean
    public JavaMailSender javaMailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost(MailProperties.getHost());
        mailSender.setPort(MailProperties.getPort());
        mailSender.setUsername(MailProperties.getUsername());
        mailSender.setPassword(MailProperties.getPassword());
        return mailSender;
    }
}

4. Send mail

Now you can use the JavaMailSender instance to send mail:

import org.springframework.mail.javamail.MimeMessagePreprocessor;
import org.springframework.mail.javamail.MimeMessagePreprocessorAdapter;
import org.springframework.mail.javamail.MimeMessagePreprocessorChain;
import org.springframework.mail.javamail.MimeMessagePreprocessorChainAdapter;

@Service
public class MailService {
    @Autowired
    private JavaMailSender javaMailSender;

    public void sendMail(String to, String subject, String body) {
        MimeMessagePreprocessorChain chain = new MimeMessagePreprocessorChainAdapter();
        MimeMessagePreprocessor preprocessor = new MimeMessagePreprocessorAdapter(chain);
        MimeMessagePreprocessorChainAdapter adapter = new MimeMessagePreprocessorChainAdapter(chain);

        MimeMessage message = javaMailSender.createMimeMessage();
        message.setSubject(subject);
        message.setText(body);
        message.setFrom("your-email-from");
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

        javaMailSender.send(message);
    }
}

In this example, we create a MimeMessage instance and set the subject, body, from address, and recipient. We then use the JavaMailSender instance to send the mail.

5. Test

Create a test class to test the mail sending functionality:

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MailServiceTest {
    @Autowired
    private MailService mailService;

    @Test
    public void testSendMail() {
        mailService.sendMail("[email protected]", "Test Subject", "Test Body");
    }
}

Run the test class to verify that the mail is sent successfully.

That's it! You've successfully set up mail sending in your Spring Boot application.

Mail Knowledge

How to send mail in spring boot