一、QQ开启SMTP
打开QQ邮箱，点击设置，进入账号，往下滑后，看见服务状态后，点击管理服务
进入管理服务后，打开服务，然后获取授权码
二 、导入依赖
<!-- 邮箱--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-mail</artifactId></dependency>
三、 yaml配置
spring:mail:host: smtp.qq.comusername: "邮箱号" #可以改成你的邮箱号，需要开启smtppassword: "授权码"default-encoding: UTF-8protocol: smtpport: 465properties:mail:smtp:auth: truesocketFactory:class: javax.net.ssl.SSLSocketFactoryport: 465ssl:enable: truestarttls:enable: truerequired: true四、Email工具类和EmailDTO 类
1.Email工具类
@Slf4j
@Component
public class EmailUtil{@Value("${spring.mail.username}")private String email;@Resourceprivate JavaMailSender javaMailSender;@Resourceprivate JavaMailSenderImpl mailSender;@Resourceprivate TemplateEngine templateEngine;public void sendHtmlMail(EmailDTO emailDTO) {try {MimeMessage mimeMessage = javaMailSender.createMimeMessage();MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage);Context context = new Context();context.setVariables(emailDTO.getCommentMap());String process = templateEngine.process(emailDTO.getTemplate(), context);mimeMessageHelper.setFrom(email);mimeMessageHelper.setTo(emailDTO.getEmail());mimeMessageHelper.setSubject(emailDTO.getSubject());mimeMessageHelper.setText(process, true);javaMailSender.send(mimeMessage);} catch (MessagingException e) {e.printStackTrace();}}
}
2. EmailDTO 类
用于封装发送所需要的信息，包括对方邮箱号，验证码、主题、内容、引用模板
@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class EmailDTO implements Serializable {private String email;private String code;private String subject;private Map<String, Object> commentMap;private String template;}
五、 使用短信邮件发送示例
通过什么Map将所需要发送的内容进行封装，email为对方的邮箱号，subject为本次邮件的主题，最后通过EmailUtil 的sendHtmlMail（）方法进行发送即可。
@Autowiredprivate EmailUtil emailUtil;@Testpublic void sendMessage(){Map<String, Object> map = new HashMap<>();map.put("content", "-------发送的内容---------");EmailDTO emailDTO = EmailDTO.builder().template("common.html").email("需要发送的邮箱").subject("主题").commentMap(map).build();CompletableFuture.runAsync(()-> emailUtil.sendHtmlMail(emailDTO));}common.html模板（放在项目src/main/resources/templates/common.html路径下）
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<div style="border-radius: 10px 10px 10px 10px;font-size: 13px;color: #555555;width: 666px;margin: 50px auto;border: 1px solid #eee;max-width: 100%;background: #ffffff repeating-linear-gradient(-45deg,#fff,#fff 1.125rem,transparent 1.125rem,transparent 2.25rem);box-shadow: 0 1px 5px rgb(0 0 0 / 15%);"><div style="background:#49BDAD;color:#ffffff;border-radius: 10px 10px 0 0;background-image: -moz-linear-gradient(0deg, rgb(67, 198, 184), rgb(255, 209, 244));background-image: -webkit-linear-gradient(0deg, rgb(67, 198, 184), rgb(255, 209, 244));height: 66px;"><p style="font-size:15px;word-break:break-all;padding: 23px 32px;margin:0;background-color: hsla(0,0%,100%,.4);border-radius: 10px 10px 0 0;">来自<a style="text-decoration:none;color:#12addb" href="https://www.pengzhenggao.top">后台管理</a>的邮件</p></div><div style="margin:20px auto;width:90%"><div style="background: #f5f5f5;margin:20px 0;padding:15px;border-radius:5px;font-size:14px;"><p th:utext="${content}"></p></div><div style="color: #8c8c8c; font-size: 10px;width: 100%;text-align: center;word-wrap: break-word;"><p style="padding: 20px">我们不会向你索取任何验证码,请勿暴露验证码于他人</p></div></div>
</div>
</body>
</html>
