Front-desk JSP check: js+ajax+ Regular Expression-"DRP"

<%@ page language= "java" contenttype= "text/html; charset=gb18030 "pageencoding=" GB18030 "%> <%@ page import =" com.bjpowernode.drp.sysmgr.domain.* "%> <%@ PA GE import= "com.bjpowernode.drp.sysmgr.manager.*"%><%request.setcharacterencoding ("GB18030");//query User ID, and determine if the database has a string command=request.getparameter ("command"); String userid= ""; String username= ""; String contacttel= ""; String email= ""; if ("Add". Equals (command)) {if (Usermanager.getinstance (). Finduserbyid (Request.getparameter (" UserID ") ==null) {User user=new User (); User.setuserid (Request.getparameter (" userid ")); User.setusername ( Request.getparameter ("UserName")), User.setpassword (Request.getparameter ("password")); User.setcontacttel ( Request.getparameter ("Contacttel")); User.setemail (Request.getparameter ("email")); Usermanager.getinstance (). AddUser (user); Out.println ("Add User success! ");} Else{userid=request.getparameter ("UserId"); Username=request.getparameter ("UserName"); contacttel= Request.getparameter ("Contacttel"); email=request.getpArameter ("email"); out.println ("Add code already exists, code =" "+ Request.getparameter (" userId ") +" "");}};/ /string command=request.getparameter ("command"),//if (command!=null && command.equals ("add")) {/* if ("add"). Equals (command) {User user=new User (); User.setuserid (Request.getparameter ("userId")); User.setusername ( Request.getparameter ("UserName")), User.setpassword (Request.getparameter ("password")); User.setcontacttel ( Request.getparameter ("Contacttel")); User.setemail (Request.getparameter ("email")); Usermanager.getinstance (). AddUser (user); Out.println ("Add User success! ");} */%> 
Front-desk JSP check: js+ajax+ Regular Expression-"DRP"