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

spring:
  mail:
    username: 你的QQ郵箱
    password: 你的授權(quán)碼
    host: smtp.qq.com
    properties:
      mail.smtp.ssl.enable: true

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class ShopsApplicationTests {
    @Autowired
    JavaMailSenderImpl mailSender;
    @Test
    public void contextLoads() throws MessagingException {
        int count = 1;//默認(rèn)發(fā)送一次
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
        while (count-- != 0) {
            String codeNum = "";
            int[] code = new int[3];
            Random random = new Random();
            //自動(dòng)生成驗(yàn)證碼
            for (int i = 0; i < 6; i++) {
                int num = random.nextInt(10) + 48;
                int uppercase = random.nextInt(26) + 65;
                int lowercase = random.nextInt(26) + 97;
                code[0] = num;
                code[1] = uppercase;
                code[2] = lowercase;
                codeNum += (char) code[random.nextInt(3)];
            }
            //標(biāo)題
            helper.setSubject("您的驗(yàn)證碼為：" + codeNum);
            //內(nèi)容
            helper.setText("您好！，感謝支持小站。您的驗(yàn)證碼為：" + "<h2>" + codeNum + "</h2>" + "千萬不能告訴別人哦！", true);
            //郵件接收者
            helper.setTo("123456789@qq.com");
            //郵件發(fā)送者，必須和配置文件里的一樣，不然授權(quán)碼匹配不上
            helper.setFrom("987654321@qq.com");
            mailSender.send(mimeMessage);
        }
    }