Springboot发送邮件功能的实现详解

<!--        邮件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
            <version>2.3.4.RELEASE</version>
        </dependency>
    </dependencies>

/**
 * 描述 工具 检验地址是否合法
 */
public class EmailUtil {
    public static boolean isValidEmailAddress(String email) throws AddressException {
        boolean result = true;
        InternetAddress internetAddress = new InternetAddress(email);
        try {
            internetAddress.validate();
        } catch (AddressException e) {
            e.printStackTrace();
            result = false;
        }
        return  result;
    }
}

User selectOneByEmailAddress(String emailAddress);

  <select id="selectOneByEmailAddress" parameterType="java.lang.String" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List"/>
    from xatu_mall_user
    where email_address = #{email_address,jdbcType=VARCHAR}
    limit 1
  </select>

boolean checkEmailRegistered(String emailAddress);

 @Override
    public boolean checkEmailRegistered(String emailAddress) {
        User user = userMapper.selectOneByEmailAddress(emailAddress);
        if (user != null) {
            return false;
        }
        return true;
    }

public interface EmailService {
    void sendSimpleMessage(String to, String subject, String text);
}

/**
 * 描述：     EmailService实现类
 */
@Service
public class EmailServiceImpl implements EmailService {
    @Autowired
    private JavaMailSender mailSender;
    @Override
    public void sendSimpleMessage(String to, String subject, String text) {
        SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
        simpleMailMessage.setFrom(Constant.EMAIL_FROM);
        simpleMailMessage.setTo(to);
        simpleMailMessage.setSubject(subject);
        simpleMailMessage.setText(text);
        mailSender.send(simpleMailMessage);
    }
}

 @PostMapping("/sendEmail")
    @ResponseBody
    public ApiRestResponse sendEmail(@RequestParam("emailAddress") String emailAddress)
            throws XatuMallException, AddressException {
        //检查邮件地址是否有效，检查是否已注册
        boolean validEmailAddress = EmailUtil.isValidEmailAddress(emailAddress);
        if(validEmailAddress) {
            boolean emailPased = userService.checkEmailRegistered(emailAddress);
            if (!emailPased) {
                return ApiRestResponse.error(100018, "邮箱已注册");
            } else{
                //发送邮件
                emailService.sendSimpleMessage(emailAddress,"主题是测试","Helllo this is a E-mail");
                return ApiRestResponse.success();
            }
        }else{
            return ApiRestResponse.error(100020,"非法邮箱");
        }
    }