Spring Boot发送邮件功能实现

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

spring:
  mail:
    # 邮件服务地址
    host: smtp.163.com
    # 端口,可不写默认
    port: 25
    # 编码格式
    default-encoding: utf-8
    # 用户名
    username: xxx@163.com
    # 授权码，就是我们刚才准备工作获取的代码
    password: xxx
    # 其它参数
    properties:
      mail:
        smtp:
          # 如果是用 SSL 方式，需要配置如下属性,使用qq邮箱的话需要开启
          ssl:
            enable: true
            required: true
          # 邮件接收时间的限制，单位毫秒
          timeout: 10000
          # 连接时间的限制，单位毫秒
          connectiontimeout: 10000
          # 邮件发送时间的限制，单位毫秒
          writetimeout: 10000

@Service
public class MailService {
    private static final Logger logger = LoggerFactory.getLogger(MailServiceImpl.class);

    @Autowired
    private JavaMailSender mailSender;

    private static final String SENDER = "xxx@163.com";

    /**
     * 发送普通邮件
     *
     * @param to      收件人
     * @param subject 主题
     * @param content 内容
     */    @Override
    public void sendSimpleMailMessge(String to, String subject, String content) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(SENDER);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(content);
        try {
            mailSender.send(message);
        } catch (Exception e) {
            logger.error("发送简单邮件时发生异常!", e);
        }
    }

    /**
     * 发送 HTML 邮件
     *
     * @param to      收件人
     * @param subject 主题
     * @param content 内容
     */    @Override
    public void sendMimeMessge(String to, String subject, String content) {
        MimeMessage message = mailSender.createMimeMessage();
        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(SENDER);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
            mailSender.send(message);
        } catch (MessagingException e) {
            logger.error("发送MimeMessge时发生异常！", e);
        }
    }

    /**
     * 发送带附件的邮件
     *
     * @param to       收件人
     * @param subject  主题
     * @param content  内容
     * @param filePath 附件路径
     */    @Override
    public void sendMimeMessge(String to, String subject, String content, String filePath) {
        MimeMessage message = mailSender.createMimeMessage();
        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(SENDER);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);

            FileSystemResource file = new FileSystemResource(new File(filePath));
            String fileName = file.getFilename();
            helper.addAttachment(fileName, file);

            mailSender.send(message);
        } catch (MessagingException e) {
            logger.error("发送带附件的MimeMessge时发生异常！", e);
        }
    }

    /**
     * 发送带静态文件的邮件
     *
     * @param to       收件人
     * @param subject  主题
     * @param content  内容
     * @param rscIdMap 需要替换的静态文件
     */    @Override
    public void sendMimeMessge(String to, String subject, String content, Map<String, String> rscIdMap) {
        MimeMessage message = mailSender.createMimeMessage();
        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(SENDER);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);

            for (Map.Entry<String, String> entry : rscIdMap.entrySet()) {
                FileSystemResource file = new FileSystemResource(new File(entry.getValue()));
                helper.addInline(entry.getKey(), file);
            }
            mailSender.send(message);
        } catch (MessagingException e) {
            logger.error("发送带静态文件的MimeMessge时发生异常！", e);
        }
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbooEmailDemoApplicationTests {

    @Autowired
    private MailService mailService;

    private static final String TO = "xxx@qq.com";
    private static final String SUBJECT = "测试邮件";
    private static final String CONTENT = "test content";

    /**
     * 测试发送普通邮件
     */    @Test
    public void sendSimpleMailMessage() {
        mailService.sendSimpleMailMessge(TO, SUBJECT, CONTENT);
    }

    /**
     * 测试发送html邮件
     */    @Test
    public void sendHtmlMessage() {
        String htmlStr = "<h1>Test</h1>";
        mailService.sendMimeMessge(TO, SUBJECT, htmlStr);
    }

    /**
     * 测试发送带附件的邮件
     * @throws FileNotFoundException
     */    @Test
    public void sendAttachmentMessage() throws FileNotFoundException {
        File file = ResourceUtils.getFile("classpath:test.txt");
        String filePath = file.getAbsolutePath();
        mailService.sendMimeMessge(TO, SUBJECT, CONTENT, filePath);
    }

    /**
     * 测试发送带附件的邮件
     * @throws FileNotFoundException
     */    @Test
    public void sendPicMessage() throws FileNotFoundException {
        String htmlStr = "<html><body>测试：图片1 <br> <img src='cid:pic1'/> <br>图片2 <br> <img src='cid:pic2'/></body></html>";
        Map<String, String> rscIdMap = new HashMap<>(2);
        rscIdMap.put("pic1", ResourceUtils.getFile("classpath:pic01.jpg").getAbsolutePath());
        rscIdMap.put("pic2", ResourceUtils.getFile("classpath:pic02.jpg").getAbsolutePath());
        mailService.sendMimeMessge(TO, SUBJECT, htmlStr, rscIdMap);
    }
}