Java发送邮箱验证码、session校验功能

public boolean sendEMail(Map<String, Object> map) {
    log.info("電子郵件接口執行開始！");
    String from = Cache.getInstance().getParamsConstant.EMAIL_FROM);
    String pwd = Cache.getInstance().getParams(Constant.EMAIL_PWD);
    String to = String.valueOf(map.get("mail"));
    String subject = String.valueOf(map.get("subject"));
    String content = String.valueOf(map.get("content"));
    String smtpHost = Cache.getInstance().getParams(Constant.EMAIL_SMTPHOST);
    if(StringUtils.isBlank(to) || StringUtils.isBlank(subject) || StringUtils.isBlank(content)){
      log.info("郵件地址（"+to+"）、主題（"+subject+"）、內容（"+content+"）有為空項，不符合發送條件");
      return false;
    }
    try{
       Properties props = new Properties();
       props.setProperty("mail.transport.protocol", "smtp"); // 使用的协议（JavaMail规范要求）
       props.setProperty("mail.smtp.host", smtpHost); // 发件人的邮箱的 SMTP服务器地址
       props.setProperty("mail.smtp.auth", "true"); // 请求认证，参数名称与具体实现有关
       // 创建Session实例对象
       Session session = Session.getDefaultInstance(props);
       // 创建MimeMessage实例对象
       MimeMessage message = new MimeMessage(session);
       // 设置发件人
       message.setFrom(new InternetAddress(from));
       // 设置收件人
       message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
       // 设置发送日期
       message.setSentDate(new Date());
       // 设置邮件主题
       message.setSubject(subject);
       // 设置纯文本内容的邮件正文
       message.setText(content);
       // 保存并生成最终的邮件内容
       message.saveChanges();
       // 设置为debug模式, 可以查看详细的发送 log
       session.setDebug(true);
       // 获取Transport对象
       Transport transport = session.getTransport("smtp");
       // 第2个参数需要填写的是QQ邮箱的SMTP的授权码，什么是授权码，它又是如何设置？
       transport.connect(from, pwd);
       // 发送，message.getAllRecipients() 获取到的是在创建邮件对象时添加的所有收件人, 抄送人, 密送人
       transport.sendMessage(message, message.getAllRecipients());
       transport.close();
    }catch(Exception e){
      log.error(e.getMessage(), e);
      return false;
    }
    log.info("電子郵件接口執行完成，執行成功！");
    return true;
  }

@RequestMapping("/sendEMail.do")
  public void sendEMail(HttpServletRequest request, HttpServletResponse response) {
    String json = "{\"success\":false,\"message\":\"操作失败\",\"returnVal\":\"\"}";
    boolean res = false;//发送邮件标记 
    Map<String, Object> map = new HashMap<String, Object>();
    try {
      String username = request.getParameter("username");
      User user = this.userService.findUserByLoginname(username);
      if(null == user){
        json = "{\"success\":false,\"message\":\"无此人员\",\"returnVal\":\"\"}";
        return;
      }
      //获取当前绑定邮箱地址
      String mail = user.getEmail();
      //验证邮箱地址
      if(StringUtils.isBlank(mail) || "null".equals(mail)){
        json = "{\"success\":false,\"message\":\"当前用户尚未绑定邮箱\",\"returnVal\":\"\"}";
        return;
      }
      //生成验证码
      String checkcode = Common.getCode();
      //发送验证码
      String _debug = Cache.getInstance().getParams(Constant.UIAS_DEBUG);
      if("1".equals(_debug)){//调试模式 不真发送 直接回显
        map.put("checkcode", checkcode);
        res = true;
      }else{//非调试模式 真实发送邮件
        //验证是否频繁发送验证码请求  单位 秒
        String intervalTime = Cache.getInstance().getParams(Constant.EMAIL_INTERVAL_TIME);
        Object emailTimeFlag = request.getSession().getAttribute("emailTimeFlag");
        boolean checkTime = true;
        if (emailTimeFlag != null) {
          int miao = (int) (((new Date()).getTime() - (Long) emailTimeFlag) / 1000);
          if (miao <= Integer.parseInt(intervalTime)) {
            checkTime=false;
          } 
        } 
        if(checkTime){
          //组装数据
          String email_validity = Cache.getInstance().getParams(Constant.EMAIL_VALIDITY);
          String vartime= String.valueOf((Integer.parseInt(email_validity)/60000));
          String content = Cache.getInstance().getParams(Constant.EMAIL_CONTENT);
          String subject = Cache.getInstance().getParams(Constant.EMAIL_SUBJECT);
          content = content.replaceAll("\\$code", checkcode);
          content = content.replaceAll("\\$time",vartime);
          map.put("mail", mail);
          map.put("subject", subject);
          map.put("content", content);
          //调用发送
          res = ieMailService.sendEMail(map);
        }else{
          json = "{\"success\":false,\"message\":\"请耐心等待，不要频繁发送验证码申请\",\"returnVal\":\"\"}";
          return;
        }
      }
      //发送成功后续操作
      if(res){
        //把验证时间放在session里
        request.getSession().setAttribute("emailTimeFlag", new Date().getTime());
        //把验证码放在session里  md5 2次加密验证码
        String codeMd5 = DigestUtils.md5Hex((DigestUtils.md5Hex(checkcode).toLowerCase()));
        request.getSession().setAttribute("emailCodeFlag", codeMd5);
        if("1".equals(_debug)){
          json = "{\"success\":true,\"message\":\"邮箱验证码发送成功，已经待填到验证码框！\",\"returnVal\":\"\",\"checkcode\":\""+checkcode+"\"}";
        }else{
          json = "{\"success\":true,\"message\":\"邮箱验证码发送成功，请查收邮件！\",\"returnVal\":\"\"}";
        }
      }
    } catch (Exception e) {
      logger.error("发送邮件验证码异常", e);
    }finally{
      renderHtml(response, json, "encoding:UTF-8");
    }
  }

@RequestMapping("/check.do")
  public void check(HttpServletRequest request, HttpServletResponse response) {
    String json = "{\"success\":false,\"message\":\"操作失败\",\"returnVal\":\"\"}";
    try {
      //验证码有效期校验
      String email_validity = Cache.getInstance().getParams(Constant.EMAIL_VALIDITY);
      Object emailTimeFlag = request.getSession().getAttribute("emailTimeFlag");
      if (emailTimeFlag != null) {
        int miao = (int) (((new Date()).getTime() - (Long) emailTimeFlag) / 1000);
        if (miao >= Integer.parseInt(email_validity)) {
          json = "{\"success\":false,\"message\":\"验证码已过有效期，请重新获取！\",\"returnVal\":\"\"}";
        }else{
          //在有效期内 比对验证码准确性
          String checkcode = request.getParameter("checkcode");
          // md5 2次加密验证码
          String codeMd5 = DigestUtils.md5Hex((DigestUtils.md5Hex(checkcode).toLowerCase()));
          Object emailCodeFlag = request.getSession().getAttribute("emailCodeFlag");
          boolean res = codeMd5.equals(String.valueOf(emailCodeFlag));
          if(res){
            json = "{\"success\":true,\"message\":\"验证码通过！\",\"returnVal\":\"\"}";
          }else{
            json = "{\"success\":false,\"message\":\"验证码不匹配，请重新核对！\",\"returnVal\":\"\"}";
          }
        }
      } 
    } catch (Exception e) {
      logger.error("验证码异常", e);
    }finally{
      renderHtml(response, json, "encoding:UTF-8");
    }
  }

// 括号表示组，被替换的部分$n表示第n组的内容
        mail = mail.replaceAll("(\\w?)(\\w+)(\\w)(@\\w+\\.[a-z]+(\\.[a-z]+)?)", "$1****$3$4");
// 括号表示组，被替换的部分$n表示第n组的内容
        phone = phone.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2");

 <input id="btnMail" type="button" onclick="start_mail_button();" value="获取邮件验证码" />

//获取邮箱验证码
function start_mail_button(){
  var username = $('#username').val().trim();//用戶名
  if('' == username){
    ErrorMsg("请输入用户名");
    return;
  }
  $.ajax({
    url: basePath+'/sendEMail.do',type: 'post',dataType: 'json',
    data: {username: username},
    success: function(data){
      if(data.success){
        SuccMsg(data.message);
        //页面获取验证码按钮样式处理
         $("#btnMail").attr('disabled','disabled');
         var count = 1 ;
         var sum = 60;
         var i = setInterval(function(){
          if(count > 60){
           $("#btnMail").attr('disabled',false);
           $("#btnMail").val("获取邮箱验证码");
           clearInterval(i);
          }else{
           $("#btnMail").val("剩余"+parseInt(sum - count)+'秒');
          }
          count++;
         },1000);
         //debug模式待填
         if(data.checkcode){
           $("#checkcode").val(data.checkcode);
         }
      }else{
        ErrorMsg("获取失败！"+data.message);
      }
    }
  });
  
}