一、邮件功能

①导入坐标

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-mail</artifactId>
			<version>2.1.5.RELEASE</version>
		</dependency>

②编写application.properties

# MailProperties
spring.mail.host=smtp.qq.com
spring.mail.username: 97267625@qq.com
spring.mail.password: fhgotlryfncvbhag
spring.mail.properties.mail.smtp.ssl.enable=true

# community
community.path.domain=http://localhost:8080
server.servlet.context-path=/community

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;

    public void sendMail(String to,String subject,String content){
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content,true);
            mailSender.send(helper.getMimeMessage());
        } catch (MessagingException e) {
            logger.error("发送邮件失败："+e.getMessage());
        }

    }
}

二、注册功能

此注册功能包括，判断用户是否存在，判断用户是否激活，发送激活邮件，在邮箱点击邮件跳转回网站改变status的值。

①注册功能编写LoginController

@Controller
public class LoginController {

    @Autowired
    private UserService userService;

    @RequestMapping(path = "/register",method = RequestMethod.GET)
    public String getRegisterPage(){
        return "/site/register";
    }

    @RequestMapping(path = "/login",method = RequestMethod.GET)
    public String getLoginPage(){
        return "/site/login";
    }

    @RequestMapping(path = "/register",method = RequestMethod.POST)
    public String register(Model model, User user){
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()){
            model.addAttribute("msg","注册成功,我们已经向您的邮箱发送了一封激活邮件，请尽快激活");
            model.addAttribute("target","/index");
            return "/site/operate-result";
        }else{
            model.addAttribute("usernameMsg",map.get("usernameMsg"));
            model.addAttribute("passwordMsg",map.get("passwordMsg"));
            model.addAttribute("emailMsg",map.get("emailMsg"));
            return "/site/register";
        }
    }

    //http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功,您的账号已经可以正常使用了!");
            model.addAttribute("target", "/login");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作,该账号已经激活过了!");
            model.addAttribute("target", "/index");
        } else {
            model.addAttribute("msg", "激活失败,您提供的激活码不正确!");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }
}

②编写UserService

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private MailClient mailClient;

    @Autowired
    private TemplateEngine templateEngine;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id){
        return userMapper.selectById(id);
    }
    
    public Map<String,Object> register(User user){
        Map<String,Object> map = new HashMap<>();
        //空值处理
        if (user == null){
            throw new IllegalArgumentException("参数不能为空！");
        }
        if (StringUtils.isBlank(user.getUsername())){
            map.put("usernameMsg","账号不能为空！");
            return map;
        }
        if (StringUtils.isBlank(user.getPassword())){
            map.put("passwordMsg","密码不能为空！");
            return map;
        }
        if (StringUtils.isBlank(user.getEmail())){
            map.put("emailMsg","邮箱不能为空！");
            return map;
        }
        //验证账号
        User u = userMapper.selectByName(user.getUsername());
        if (u != null){
            map.put("usernameMsg","该用户已被注册");
            return map;
        }
        //验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if (u != null){
            map.put("emailMsg","该邮箱已被注册");
            return map;
        }
        //注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png",new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        // 激活邮件
        Context context = new Context();
        context.setVariable("email",user.getEmail());
        //http://localhost:8080/community/activation/101/code
        String url = domain + contextPath + "/activation/" + user.getId() +"/" + user.getActivationCode();
        context.setVariable("url",url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(),"激活账号",content);

        return map;
    }
    
    public int activation(int userId, String code) {
        User user = userMapper.selectById(userId);
        if (user.getStatus() == 1) {
            return ACTIVATION_REPEAT;
        } else if (user.getActivationCode().equals(code)) {
            userMapper.updateStatus(userId, 1);
            return ACTIVATION_SUCCESS;
        } else {
            return ACTIVATION_FAILURE;
        }
    }
}

Q.E.D.