Javaでメール登録機能を完成させる例を詳しく解説

package cn.ictgu.tools.mail;

import cn.ictgu.dao.model.User;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.log4j.Log4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

/**
 * 邮件服务
 * Created by Silence on 2017/3/11.
 */
@Service
@Log4j
public class MailService {

 @Autowired
 private JavaMailSender mailSender;

 @Value("${spring.mail.username}")
 private String from;

 private static final String TITLE_SIGN_UP = "[邮件标题]";

 private static final String CONTENT = "[邮件内容]";

 public void userValidate(User user, String token){
 MimeMessage mailMessage = mailSender.createMimeMessage();
 try {
  MimeMessageHelper helper = new MimeMessageHelper(mailMessage, true, "GBK");
  helper.setFrom(from);
  helper.setTo(user.getEmail());
  helper.setSubject(TITLE_SIGN_UP);
  String link = "http://www.ictgu.cn/validate/" + token;
  String message = String.format(CONTENT, user.getNickname(), link, link, user.getEmail());
  helper.setText(message, true);
  mailSender.send(mailMessage);
 } catch (MessagingException e) {
  log.error("发送邮件失败：User:" + JSONObject.toJSONString(user) + ", Token: " + token);
 }

 }

 public String getTokenOfSignUp(User user){
 String token = UUID.randomUUID().toString();
 String value = JSONObject.toJSONString(user);
 stringRedisTemplate.opsForValue().set(signUpPrefix + token, value);
 stringRedisTemplate.expire(signUpPrefix + token, 12, TimeUnit.HOURS);
 return token;
 }

 public boolean signUp(User user){
 String email = user.getEmail();
 if (existEmail(email)){
  log.error("用户注册，邮箱已注册:" + email);
  return false;
 }
 sendValidateEmail(user);
 return true;
 }

 @Async
 private void sendValidateEmail(User user){
 String token = tokenManager.getTokenOfSignUp(user);
 log.error("用户注册，准备发送邮件：User:" + JSONObject.toJSONString(user) + ", Token: " + token);
 mailService.userValidate(user, token);
 }

 private boolean existEmail(String email){
 return mapper.selectByEmail(email) != null;
 }

@RestController
public class UserApi {

 @Autowired
 private UserService userService;

 @RequestMapping(value = "/sign-up", method = RequestMethod.POST)
 public SimpleResponse signUp(HttpServletRequest request){
 User user = createUser(request);
 SimpleResponse response = checkSignUpRequest(user);
 if (response.getCode() == 100){
  if (!userService.signUp(user)){
  response.setCode(200);
  response.setMessage("此邮箱已注册，请勿重复注册！");
  return response;
  }else {
  response.setMessage("注册激活邮件已发送至您邮箱，请在12小时内激活完成注册！");
  return response;
  }
 }
 return response;
 }

 private SimpleResponse checkSignUpRequest(User user){
 SimpleResponse response = new SimpleResponse();
 String email = user.getEmail();
 if (!CheckUtils.checkEmail(email)){
  response.setCode(200);
  response.setMessage("邮箱格式不合法");
  return response;
 }
 String password = user.getPassword();
 if (!CheckUtils.checkPassword(password)){
  response.setCode(200);
  response.setMessage("密码长度必须为8-16位，且必须包含数字和字母");
  return response;
 }
 String nickname = user.getNickname();
 if (!CheckUtils.checkNickname(nickname)){
  response.setCode(200);
  response.setMessage("昵称长度不合法");
  return response;
 }
 response.setCode(100);
 return response;
 }

}