添加邮箱的版本管理

YuNan-system-start/src/main/java/com/yunan/service/impl/EmailServiceImpl.java

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+package com.yunan.service.impl;
+
+import com.yunan.service.EmailService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+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;
+
+@Service
+public class EmailServiceImpl implements EmailService {
+    @Autowired
+    private JavaMailSender mailSender;
+
+    @Value("${spring.mail.username}")
+    private String from;
+
+    /**
+     * 发送邮件
+     *
+     * @param to      收件人邮箱
+     * @param subject 邮件主题
+     * @param content 邮件内容
+     */
+    public void sendMail(String to, String subject, String content) throws MessagingException {
+        // 创建邮件消息
+        MimeMessage message = mailSender.createMimeMessage();
+        MimeMessageHelper helper = new MimeMessageHelper(message, true);
+        helper.setFrom(from);
+        helper.setTo(to);
+        helper.setSubject(subject);
+        helper.setText(content, true);
+
+        // 发送邮件
+        mailSender.send(message);
+    }
+}