一.启用客户端STMP服务

添加发送邮件功能，需要指定发送邮件的email地址
以QQ邮箱为例，展示如何开启 STMP 服务，以授权邮箱可作为发送方发送邮件

设置->账户目录下，**开启STMP服务，并生成授权码**

二.配置spring Email

• 1.导入jar包

   <dependency\>  
          <groupId\>org.springframework.boot</groupId\>  
          <artifactId\>spring-boot-starter-mail</artifactId\>  
          <version\>2.1.6.RELEASE</version\>  
   </dependency\>

• 2.配置邮箱参数

  在application.properties中配置：
   ```
   //主机号
   spring.mail.host\=smtp.qq.com
   //端口号  
   spring.mail.port\=465
   //email账号  
   spring.mail.username\=371568309@qq.com
   //密码（授权码）  
   spring.mail.password\=nezhkkcjfvqsbhdd
   //支持协议  
   spring.mail.protocol\=smtps
   //采用ssl安全连接  
   spring.mail.properties.mail.smtp.ssl.enable\=true
   ```
  

• 3.编写MailClient工具类

  @Component  
  public class MailClient {  
  
      private static final Logger logger \= LoggerFactory.getLogger(MailClient.class);  
  
      @Autowired  
    private JavaMailSender mailSender;  
  
      @Value("${spring.mail.username}")  
      private String from;  
  
      /\*\*  
   \* 发送邮件方法  
    \* @param to 发给谁  
    \* @param subject 邮件标题  
    \* @param context 邮件内容  
    \*/  
    public void sendMail(String to, String subject, String context){  
          try{  
              //构建邮件发送对象  
    MimeMessage message = mailSender.createMimeMessage();  
              MimeMessageHelper helper = new MimeMessageHelper(message);  
              helper.setFrom(from);  
              helper.setTo(to);  
              helper.setSubject(subject);  
              helper.setText(context, true);//支持html格式  
    //发送邮件  
    mailSender.send(helper.getMimeMessage());  
          }catch (Exception e){  
              logger.error("发送邮件失败："+e.getMessage());  
          }  
  
      }  
  
  }

三.发送邮件

@Autowired  
private MailClient mailClient;  

@Autowired  
private TemplateEngine templateEngine;//spring boot内置的模板引擎，调用thymeleaf  

@Test  
public void testTextMail(){  
    mailClient.sendMail("371568309@qq.com","TEST","你好");  
}  

@Test  
public void testHtmlMail(){  
    //创建内容name--value  
  Context context = new Context();  
    context.setVariable("username","219");  
    //绑定模板和内容  
  String content = templateEngine.process("/mail/demo", context);  

    mailClient.sendMail("371568309@qq.com","TEST",content);  
}