1.在yml配置文件添加相关配置（mail是在spring配置下的）

 host：是你选择发送邮箱服务器的地址

        例子：发送qq邮件服务器：smtp.qq.com

 port：发送邮箱服务器的端口

        例子：发送qq邮件服务器端口号：465或587

 username：邮箱账号

 password：邮箱密码

 2.EmailUtil

上代码！！！！！！！！！

    //注入MailSender
    private static JavaMailSenderImpl mailSender;

    /**
     * 初始化发送服务器
     */
    private void initSmtpMail(SendTextMailDto sendMailDto) {

        mailSender = new JavaMailSenderImpl();
        mailSender.setHost(sendMailDto.getHost());
        mailSender.setPort(sendMailDto.getPort());
        mailSender.setUsername(sendMailDto.getUsername());
        mailSender.setPassword(sendMailDto.getPassword());
        mailSender.setProtocol(sendMailDto.getProtocol());
        mailSender.setDefaultEncoding(sendMailDto.getDefaultEncoding());
    }

    /**
     * 发送文本邮件
     *
     * @param sendMailDto 邮件对象(收件人，邮件主题，邮件内容)
     */
    public void sendSimpleTextMailActual(SendTextMailDto sendMailDto) {
        //初始化发送服务器
        initSmtpMail(sendMailDto);
        //检验参数：邮件主题、收件人、邮件内容必须不为空才能够保证基本的逻辑执行
        if (sendMailDto == null) {
            throw new BizException("发送邮件不可以为空");
        }
        if (sendMailDto.getSubject() == null || sendMailDto.getMailTo() == null || sendMailDto.getContent() == null) {
            log.error("邮件-> {} 无法继续执行，因为缺少基本的参数：邮件主题、收件人、邮件内容", sendMailDto.getSubject());
            throw new BizException("邮件无法继续发送，因为缺少必要的参数！");
        }

        String[] toWho = sendMailDto.getMailTo().split(",");
        if (toWho.length == 0) {
            throw new BizException("邮件无法继续发送，因为缺少必要的参数！");
        }
            //创建一个简单邮件信息对象
            SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
            //设置邮件的基本信息
            handleBasicInfo(simpleMailMessage, sendMailDto.getSubject(), sendMailDto.getContent(), toWho,sendMailDto);
            //发送邮件
            mailSender.send(simpleMailMessage);
            log.info("发送邮件成功: 主题->{}", sendMailDto.getSubject(), toWho);
    }


    /**
     * 用于填充简单文本邮件的基本信息
     *
     * @param simpleMailMessage：文本邮件信息对象
     * @param subject：邮件主题
     * @param content：邮件内容
     * @param toWho：收件人
     */
    public void handleBasicInfo(SimpleMailMessage simpleMailMessage, String subject, String content, String[] toWho,SendTextMailDto sendMailDto) {
        //设置发件人
        simpleMailMessage.setFrom(sendMailDto.getUsername());
        //设置邮件的主题
        simpleMailMessage.setSubject(subject);
        //设置邮件的内容
        simpleMailMessage.setText(content);
        //设置邮件的收件人
        simpleMailMessage.setTo(toWho);
    }

 3.Controller

    @Value("${spring.mail.host}")
    private  String HOST;
    @Value("${spring.mail.port}")
    private   Integer PORT ;
    @Value("${spring.mail.username}")
    private   String USERNAME ;
    @Value("${spring.mail.password}")
    private   String PASSWORD ;
    @Value("${spring.mail.protocol}")
    private  String protocol;
    @Value("${spring.mail.default-encoding}")
    private   String defaultEncoding;

  @ApiOperation("获取邮箱注册验证码")
    @RequestMapping(value = "/a",method = RequestMethod.GET)
    @ResponseBody
    public CommonResult a(@RequestParam String email)  {
        SendTextMailDto sendTextMailDto = new SendTextMailDto();
        sendTextMailDto.setHost(HOST);
        sendTextMailDto.setPassword(PASSWORD);
        sendTextMailDto.setPort(PORT);
        sendTextMailDto.setProtocol(protocol);
        sendTextMailDto.setUsername(USERNAME);
        sendTextMailDto.setDefaultEncoding(defaultEncoding);
        sendTextMailDto.setMailTo(email);
        return memberService.emailCode(sendTextMailDto);
    }

4.在yml配置文件里面添加redis配置

 5.service

  /**
     * 获取邮箱注册验证码
     * @param sendTextMailDto 发送邮箱需要的参数
     * @return
     */
    CommonResult emailCode(SendTextMailDto sendTextMailDto);

6.serviceImpl

  @Value("${redis.key.prefix.authCode}")
    private String REDIS_KEY_PREFIX_AUTH_CODE;
    @Value("${redis.key.expire.authCode}")
    private Long AUTH_CODE_EXPIRE_SECONDS;

    public CommonResult emailRegister(EmailRegisterDto emailRegisterDto){
        //获取存储到redis的验证码
      String str = stringRedisTemplate.opsForValue().get(REDIS_KEY_PREFIX_AUTH_CODE+emailRegisterDto.getEmail());
       //对比验证码是否正确
        if(StringUtils.isNotBlank(stringRedisTemplate.opsForValue().get(REDIS_KEY_PREFIX_AUTH_CODE+emailRegisterDto.getEmail()))&&emailRegisterDto.getCode().equals(str.substring(str.indexOf("：")+1))){
            //没有该用户进行添加操作
            UmsMember umsMember = new UmsMember();
            BeanUtil.copyProperties(emailRegisterDto, umsMember);
            //获取默认会员等级并设置
            UmsMemberLevelExample levelExample = new UmsMemberLevelExample();
            levelExample.createCriteria().andDefaultStatusEqualTo(1);
            List<UmsMemberLevel> memberLevelList = memberLevelMapper.selectByExample(levelExample);
            if (!CollectionUtils.isEmpty(memberLevelList)) {
                umsMember.setMemberLevelId(memberLevelList.get(0).getId());
            }
            //将密码进行加密操作
            String encodePassword = passwordEncoder.encode(emailRegisterDto.getPassword());
            umsMember.setPassword(encodePassword);
            memberMapper.insertSelective(umsMember);
            return CommonResult.success("注册成功");
        }else {
            throw  new  BizException("验证码已失效");
        }

    }

ending!!!!!!!!!!!ok!!!!!!!