比 Java Mail 更簡單的 Spring boot email

MacauYeah ・2025-10-24

使用 Spring boot 對接 SMTP gateway 發 email ，相對是容易的。 基本上，它就是會使用自建的 org.springframework.mail.javamail.* , 對接 javax.mail.* / jakarta.mail.* 以前的所有設定值 ，都可以經 spring.mail.properties.* 傳入 例如 spring.mail.properties.mail.smtp.auth=true spring.mail.properties.mail.smtp.ssl.enable=true spring.mail.properties.mail.smtp.socketFactory.port=465 就等於過去 java.util.Properties props = new java.util.Properties(); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.ssl.enable", "true"); props.put("mail.smtp.socketFactory.port", "465"); 一個最簡單可以連去 google smtp 的簡易 code 如下 ### application.properties spring.mail.host=smtp.gmail.com spring.mail.port=587 spring.mail.username= spring.mail.password= spring.mail.properties.mail.smtp.auth=true spring.mail.properties.mail.smtp.starttls.enable=true // SpringBootEmailApplicationTests.java @SpringBootTest class SpringBootEmailApplicationTests { @Autowired private JavaMailSender javaMailSender; @Value("${spring.mail.username}") private String fromAddress; private static final Logger LOG = LoggerFactory.getLogger(SpringBootEmailApplicationTests.class); @Test void contextLoads() { try { SimpleMailMessage mailMessage = new SimpleMailMessage(); mailMessage.setFrom(fromAddress); mailMessage.setTo("XXXXXXXX"); mailMessage.setText("this is backend email trigger for spring boot"); mailMessage.setSubject("spring boot test mail"); javaMailSender.send(mailMessage); } catch (Exception e) { LOG.error("Error while Sending Mail"); throw new RuntimeException(e); } } } github 原始碼 https://github.com/macauyeah/spring-boot-demo/tree/main/spring-boot-tutorial/spring-boot-email