Java로 SMTP 메일 발송하기

pom.xml

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

application.properties

spring.mail.host=smtp.gmail.com
spring.mail.port=587
spring.mail.username=your-email@gmail.com
spring.mail.password=your-password
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

Email Service

package com.example.email;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

@Service
public class EmailService {

    @Autowired
    private JavaMailSender mailSender;

    public void sendEmail(String to, String subject, String body) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(body);
        message.setFrom("your-email@gmail.com");  // Replace with your email
        mailSender.send(message);
    }
    
    public void sendHtmlEmail(String to, String subject, String htmlBody) throws MessagingException {
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);

        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(htmlBody, true); // Set 'true' for HTML content
        helper.setFrom("your-email@gmail.com"); // Replace with your email

        mailSender.send(mimeMessage);
    }
}

Email Controller

package com.example.email;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class EmailController {

    @Autowired
    private EmailService emailService;

    @GetMapping("/send-email")
    public String sendEmail(@RequestParam String to, @RequestParam String subject, @RequestParam String body) {
        emailService.sendEmail(to, subject, body);
        return "Email sent successfully!";
    }
}

Test

http://localhost:8080/send-email?to=recipient-email@gmail.com&subject=Test&body=Hello!