Lecture Notes: Sending Emails using Spring Boot

Introduction

• Presented by: Suman from D-CODE
• Topic: How to send emails using Spring Boot
• Overview: Step-by-step tutorial to set up and send emails using Spring Boot

To-Do List

1. Download Starter Package
   • Visit Spring Initializer (start.spring.io)
   • Project settings:
     • Task: Maven
     • Language: Java
     • Spring Boot Version: 3.1.1
     • Group Name: decode now
     • Artifact Name: mail demo
     • Packaging: jar
     • Java Version: 20
   • Add dependencies:
     • Spring Web: Handles HTTP requests and server creation
     • Lombok: Reduces boilerplate code
     • Java Mail Sender: For sending emails
   • Generate and download the package
2. Add Necessary Configurations
   • Open application.properties file in src/main/resources
   • Add configurations for mail server: spring.mail.host=smtp.gmail.com spring.mail.port=587 [email protected] spring.mail.password=your_app_password spring.mail.properties.mail.smtp.auth=true spring.mail.properties.mail.smtp.starttls.enable=true
   • Generate app password from Google account for use in application.properties
3. Define Model for Mail Structure
   • Create a package named model
   • Create MailStructure class inside the model package: public class MailStructure { private String subject; private String message; // Lombok annotations for getters and setters @Getter @Setter }
4. Create Controller Method
   • Create a package named controller
   • Create MailController class inside the controller package: @RestController @RequestMapping("/mail") public class MailController { @Autowired private MailService mailService; @PostMapping("/send/{mail}") public String sendMail(@PathVariable String mail, @RequestBody MailStructure mailStructure) { mailService.sendMail(mail, mailStructure); return "Mail sent successfully"; } }
5. Create Service Method
   • Create a package named service
   • Create MailService class inside the service package: @Service public class MailService { @Autowired private JavaMailSender mailSender; @Value("${spring.mail.username}") private String fromMail; public void sendMail(String toMail, MailStructure mailStructure) { SimpleMailMessage message = new SimpleMailMessage(); message.setFrom(fromMail); message.setTo(toMail); message.setSubject(mailStructure.getSubject()); message.setText(mailStructure.getMessage()); mailSender.send(message); } }

Sending a Mail

• Test the application using Postman:
  • Method: POST
  • URL: http://localhost:8080/mail/send/{mailID}
  • Headers: Content-Type: application/json
  • Body: { "subject": "Testing", "message": "This is a test mail" }

Conclusion

• Recap of steps taken to send an email using Spring Boot
• Encouraged to like, comment, and subscribe for more tutorials