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