使用Spring Boot 优雅地发送邮件

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

#邮箱环境配置
#发送邮件服务器
spring.mail.host=smtp.163.com
#发送邮件的邮箱地址
spring.mail.username=XXX@163.com
#邮箱密码
spring.mail.password=yourPassword
spring.mail.default-encoding=utf-8
spring.mail.port=465
spring.mail.protocol=smtps
spring.mail.from=${spring.mail.username}

public interface MailService {

    Boolean sendSimpleMail(String to, String subject, String content);
    String sendHtmlEmail(String to, String subject, String content);
    String sendAttachmentsMail(String to, String subject, String content, String filePath);
}

@Service
@Slf4j
public class MailServiceImpl implements MailService {
    @Autowired
    private JavaMailSender javaMailSender;
    @Value("${spring.mail.from}")
    private String from;
    /**
     * 发送普通电子邮件
     * @param to 邮件接收地址
     * @param subject 邮件主题
     * @param content 邮件内容
     * @return 电子邮件是否发送成功
     */
    @Override
    public Boolean sendSimpleMail(String to, String subject, String content) {
        SimpleMailMessage msg = new SimpleMailMessage();
        msg.setFrom(from);
        msg.setTo(to);
        msg.setSubject(subject);
        msg.setText(content);
        try {
            javaMailSender.send(msg);
            log.info("简单邮件已经发送。" + content);
        } catch (MailException ex) {
            log.error("发送失败：" + ex.getMessage());
            return false;
        }
        return true;
    }
    /**
     * 发送HTML邮件
     * @param to
     * @param subject
     * @param content
     * @return
     */
    @Override
    public String sendHtmlEmail(String to, String subject, String content) {
        MimeMessage message = null;
        try {
            message = javaMailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            
            helper.setTo(to);
            helper.setSubject(subject);
            // 撰写HTML格式的内容
            StringBuffer sb = new StringBuffer("<p style=‘color:#6db33f‘>使用Spring Boot发送HTML格式电子邮件。</p>");
            helper.setText(sb.toString(), true);
            javaMailSender.send(message);
            return "发送成功";
        } catch (Exception e) {
            return e.getMessage();
        }
    }
    /**
     * 发送带附件的邮件
     *
     * @param to
     * @param subject
     * @param content
     * @param filePath
     */
    @Override
    public String sendAttachmentsMail(String to, String subject, String content, String filePath) {
        MimeMessage message = javaMailSender.createMimeMessage();
        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);

            FileSystemResource file = new FileSystemResource(new File(filePath));
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
            helper.addAttachment(fileName, file);

            javaMailSender.send(message);
            log.info("带附件的邮件已经发送。");
        } catch (Exception e) {
            log.error("发送带附件的邮件时发生异常！", e);
            return "失败";
        }
        return "成功";
    }
}

@RestController
@RequestMapping("/sendEmail")
public class SendEmailsController {

    @Autowired
    private MailService mailService;
    private static String to = "yyy@163.com";
    @RequestMapping("/sendSimpleEmail")
    @ResponseBody
    public boolean sendEmail() {
        return mailService.sendSimpleMail(to, "一封文本格式的邮件", "哈哈哈");
    }
    @RequestMapping("/sendHtmlEmail")
    @ResponseBody
    public String sendHtmlEmail() {
        return mailService.sendHtmlEmail(to, "一封HTML格式的邮件", "哈哈哈");
    }
    @GetMapping(value = "/sendAttachmentsMail")
    public String sendAttachmentsMail() {
        return mailService.sendAttachmentsMail(to, "测试发送附件Title",
                "测试发送附件 title", "C:\\Users\\20190265\\Pictures\\15718018.jpg");
    }
}