使用SpringBoot实现自动发送注册验证码邮件功能

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

spring.mail.host=smtp.qq.com
spring.mail.port=587
spring.mail.username=你的QQ邮箱@qq.com
spring.mail.password=你的授权码
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

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

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.util.Random;

@Service
public class EmailService {

    @Autowired
    private JavaMailSender mailSender;

    // 生成6位随机验证码
    public String generateVerificationCode() {
        Random random = new Random();
        int code = 100000 + random.nextInt(900000); // 范围 100000-999999
        return String.valueOf(code);
    }

    // 发送注册验证码邮件
    public void sendVerificationEmail(String toEmail, String code) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);

        helper.setFrom("你的QQ邮箱@qq.com"); // 发件人
        helper.setTo(toEmail); // 收件人
        helper.setSubject("注册验证码"); // 邮件主题
        helper.setText("<h3>您的注册验证码是：" + code + "</h3><p>请在5分钟内使用，此验证码仅用于注册。</p>", true); // HTML 内容

        mailSender.send(message);
    }
}

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

import javax.mail.MessagingException;

@RestController
public class RegisterController {

    @Autowired
    private EmailService emailService;

    @PostMapping("/register/send-code")
    public String sendVerificationCode(@RequestParam String email) {
        try {
            String code = emailService.generateVerificationCode();
            emailService.sendVerificationEmail(email, code);
            return "验证码已发送至 " + email;
        } catch (MessagingException e) {
            return "发送失败：" + e.getMessage();
        }
    }
}