pom包配置

<!--郵件-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<!--freemarker模板引擎-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>   

模板引擎配置

spring:
  freemarker:
    template-loader-path: classpath:/templates/

郵件服務器的配置

spring:
    mail
        host: smtp.qq.com 
        username: xxx@qq.com 
        password: cumhxmicujosbjii #開啟POP3之后設置的客戶端授權碼 
        default-encoding: UTF-8

簡單的文本郵件

@Override
public void sendSimpleMail(String to, String subject, String content) throws MailException {
    SimpleMailMessage message = new SimpleMailMessage();
    message.setFrom(from); // 郵件發(fā)送者
    message.setTo(to); // 郵件接受者
    message.setSubject(subject); // 主題
    message.setText(content); // 內容

    mailSender.send(message);
}

發(fā)送帶圖片的郵件

controller的代碼

@ApiOperation(value = "html郵件測試" ,  notes="html郵件測試")
@GetMapping("/testHtml")
public ResultVo testHtml() throws IOException, TemplateException, MessagingException {
    Map<String, Object> model = new HashMap();
    model.put("UserName", "yao");
    Template template = configuration.getTemplate("welcome.ftl");
    String html = FreeMarkerTemplateUtils.processTemplateIntoString(template, model);

    emailService.sendHtmlMail("249982536@163.com","html郵件",html);
    return ResultUtils.success();
}

service的代碼

@Override
public void sendHtmlMail(String to, String subject, String content) throws MessagingException {
    MimeMessage message = mailSender.createMimeMessage();
    //true 表?示需要創(chuàng)建?一個 multipart message
    MimeMessageHelper helper = new MimeMessageHelper(message, true);
    helper.setFrom(from);
    helper.setTo(to);
    helper.setSubject(subject);
    helper.setText(content, true);
    mailSender.send(message);
}