Java实现邮件找回密码功能

@RequestMapping(value = "/user/i_forget_password")

@ResponseBody

public
Map forgetPass(HttpServletRequest request,String userName){
 Users users = userService.findUserByName(userName);
 Map map = new
HashMap<String ,String >();
 String msg = "";
 if(users == null){    //用户名不存在
  msg = "用户名不存在,你不会忘记用户名了吧?";
  map.put("msg",msg);
  return
map;

 }

 try{

  String secretKey= UUID.randomUUID().toString(); //密钥

  Timestamp outDate = new
Timestamp(System.currentTimeMillis()+30*60*1000);//30分钟后过期

  long
date = outDate.getTime()/1000*1000;     //忽略毫秒数

  users.setValidataCode(secretKey);
  users.setRegisterDate(outDate);
  userService.update(users); //保存到数据库
  String key = users.getUserName()+"$"+date+"$"+secretKey;
  String digitalSignature = MD5.MD5Encode(key);     //数字签名
  String emailTitle = "有方云密码找回";
  String path = request.getContextPath();
  String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  String resetPassHref = basePath+"user/reset_password?sid="+digitalSignature+"&userName="+users.getUserName();
  String emailContent = "请勿回复本邮件.点击下面的链接,重设密码<br/><a href="+resetPassHref +" rel="external nofollow" target='_BLANK'>点击我重新设置密码</a>" +

    "<br/>tips:本邮件超过30分钟,链接将会失效，需要重新申请'找回密码'"+key+"\t"+digitalSignature;

  System.out.print(resetPassHref);
  SendMail.getInstatnce().sendHtmlMail(emailTitle,emailContent,users.getEmail());

  msg = "操作成功,已经发送找回密码链接到您邮箱。请在30分钟内重置密码";

  logInfo(request,userName,"申请找回密码");

 }catch
(Exception e){

  e.printStackTrace();

  msg="邮箱不存在？未知错误,联系管理员吧。";

 }

 map.put("msg",msg);

 return
map;

}

@RequestMapping(value = "/user/reset_password",method = RequestMethod.GET)

 public
ModelAndView checkResetLink(String sid,String userName){

  ModelAndView model = new
ModelAndView("error");

  String msg = "";

  if(sid.equals("") || userName.equals("")){
   msg="链接不完整,请重新生成";
   model.addObject("msg",msg) ;
   logInfo(userName,"找回密码链接失效");
   return
model;

  }

  Users users = userService.findUserByName(userName);
  if(users == null){
   msg = "链接错误,无法找到匹配用户,请重新申请找回密码.";
   model.addObject("msg",msg) ;
   logInfo(userName,"找回密码链接失效");
   return
model;

  }

  Timestamp outDate = users.getRegisterDate();
  if(outDate.getTime() <= System.currentTimeMillis()){   //表示已经过期
   msg = "链接已经过期,请重新申请找回密码.";

   model.addObject("msg",msg) ;

   logInfo(userName,"找回密码链接失效");

   return
model;

  }

  String key = users.getUserName()+"$"+outDate.getTime()/1000*1000+"$"+users.getValidataCode();   //数字签名
  String digitalSignature = MD5.MD5Encode(key);
  System.out.println(key+"\t"+digitalSignature);
  if(!digitalSignature.equals(sid)) {

   msg = "链接不正确,是否已经过期了?重新申请吧";

   model.addObject("msg",msg) ;

   logInfo(userName,"找回密码链接失效");

   return
model;

  }

  model.setViewName("user/reset_password"); //返回到修改密码的界面
  model.addObject("userName",userName);

  return
model;

 }

sun.misc.BASE64Encoder enc = new
sun.misc.BASE64Encoder();

mailMessage.setSubject(MimeUtility.encodeText(mailInfo.getSubject(), "UTF-8", "B"));  //解决linux邮件title乱码