JSP Login Verification Demo servlet, login, success_jsp programming

JSP's Login Verification demo

part_1:login.jsp: Login page:

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <% String path = Request.getcontextpath ( 
 ); 
String basepath = request.getscheme () + "://" + request.getservername () + ":" + request.getserverport () + path + "/"; %> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >  

part_2: Loginverificationservlet.java: Verify logon information, there is no connection to the database, the default is only Username:admin, password:888888 login success, landing failure: Re-forwarding to the login.jsp and prompts the user to login failed, login again;

Package cn.mike.servlet.test_1209_Login; 
 
Import java.io.IOException; 
Import javax.servlet.ServletException; 
Import Javax.servlet.http.Cookie; 
Import Javax.servlet.http.HttpServlet; 
Import Javax.servlet.http.HttpServletRequest; 
 
Import Javax.servlet.http.HttpServletResponse; public class Loginverificationservlet extends HttpServlet {private static final long Serialversionuid =-688632789279 
 
 6230543L; public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {Str 
 ing username = request.getparameter ("username"); 
 String Password = request.getparameter ("password"); if (("admin". Equals (username)) && ("888888". Equals (password)) {//Login succeeded/save cookie to client cookie Usercookie = NE 
 W Cookie ("username", username); 
 Usercookie.setmaxage (* 2);//Expiry:2 minutes Response.addcookie (Usercookie); 
 Redirect to a new page and prompt the XXX user to log in successfully (using Session access username); 
 Request.getsession (). setattribute ("username", username); REquest.getsession (). setattribute ("Logedin", true); 
 Response. Sendredirect ("/servletdemoproject/login-demo/success-page-1.jsp"); else {//Login failed//forward to login interface and prompt for error message: Request.setattribute ("fdbkmsg", "username or password is wrong!") 
 "); 
 Request.getrequestdispatcher ("/login-demo/login.jsp"). Forward (request, response); } public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, ioexcept 
 Ion {//do same as get-method:doget (request, response);  } 
 
}

part_3: success-page-1.jsp: Verify that the login is redirected to the page, prompting the user to log in successfully; If the user attempts to pass the improper path, e.g: access from the Address bar, will be forwarded to the login interface, and make a prompt;

<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%> <% String path = Request.getcontextpath ( 
 ); 
String basepath = request.getscheme () + "://" + request.getservername () + ":" + request.getserverport () + path + "/"; %> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >  

Part_4:success-page-2.jsp: Landing Success Page 2, if the login has been successfully saved to the session, the page will be checked to prevent violent access from the address bar;

<%@ page language= "java" import= "Java.util.Date" pageencoding= "UTF-8"%> <%@ page language= "java" import= "Java . text. 
 SimpleDateFormat "%> <% String Path = Request.getcontextpath (); 
String basepath = request.getscheme () + "://" + request.getservername () + ":" + request.getserverport () + path + "/"; %> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >  

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