Java Web Learning (30): Implementing User Login with Jsp+servlet+javabean

Implement User Login

User name admin, password admin, login successfully use the server internal jump to login_success2.jsp page, and prompt login successful use

Households If the login fails, jump to the login_failure2.jsp page.

Before we used JSP implemented, also Jsp+javabean implemented, this time we are more detailed, using Jsp+servlet+javabean implementation

Households Login, many of the source code is also written in the front.

Let's look at the overall directory structure first:

Take a look at the source code:

Entity class Users.java Source code:

Package Com.entity;import java.io.unsupportedencodingexception;/** * User entity class * @author Administrator * @date July 11, 2016 */p Ublic class Users {Private propertiesPrivate String username;private String password;No parameter constructorPublic Users () {}The setter and getter methods are obtained by refactoringPublic String GetUserName () {return username;}public void Setusername (String username) throws Unsupportedencodingexception {This.username = toUTF8 (username);}Public String GetPassword () {return password;}public void SetPassword (String password) {This.password = password;}private string ToUTF8 (String str) throws Unsupportedencodingexception {return new String (Str.getbytes ("iso-8859-1"), "UTF-8");}}

servlet layer Loginservlet.java Source code:

Package Com.servlet;import Java.io.ioexception;import Javax.servlet.servletconfig;import Javax.servlet.servletexception;import Javax.servlet.annotation.webservlet;import Javax.servlet.http.HttpServlet; Import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import com.entity.users;/** * Servlet Implementation class Loginservlet */@WebServlet ("/loginservlet") public class Loginservlet extends HttpServlet {Private static final long serialversionuid = 1L;        /** * @see httpservlet#httpservlet () */public Loginservlet () {super (); TODO auto-generated Constructor stub}/*** @see Servlet#init (servletconfig)*/public void init (ServletConfig config) throws servletexception {TODO auto-generated Method Stub}/*** @see Servlet#destroy ()*/public void Destroy () {TODO auto-generated Method Stub}/*** @see Httpservlet#doget (httpservletrequest request, httpservletresponse response)*/protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {TODO auto-generated Method StubDoPost (request, response);}/*** @see Httpservlet#dopost (httpservletrequest request, httpservletresponse response)*/protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {TODO auto-generated Method StubRequest.setcharacterencoding ("UTF-8");//Prevent Chinese garbledUsers user = new users ();String username = request.getparameter ("username");String Password = request.getparameter ("password");User.setusername (username);User.setpassword (password);Save registered successful user object in Session objectRequest.getsession (). SetAttribute ("Loginuser", user);Determine if the user name is legitimateif (User.getusername (). Equals ("admin") &&user.getpassword (). Equals ("admin")) {Response.sendredirect ("login_success2.jsp");}else{Response.sendredirect ("login_failure2.jsp");}}}

loginbyservlet.jsp page Source:

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding=" UTF-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" ><title> Login Screen </title><!--End of Page title--<!--Libraries--<link type= "Text/css" href= "Css/login.css" rel= "stylesheet"/><script type= "Text/javascript" src= "Js/jquery-1.3.2.min.js" ></script><script type= "Text/javascript" src= "Js/easytooltip.js" ></script><script type= "Text/javascript" src= "Js/jquery-ui-1.7.2.custom.min.js" ></script><!--End of Libraries-->

login_success2.jsp page Source:

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding=" UTF-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" ><title>login_success page </title><!--End of Page title--<!--Libraries--<link type= "Text/css" href= "Css/login.css" rel= "stylesheet"/><script type= "Text/javascript" src= "Js/jquery-1.3.2.min.js" ></script><script type= "Text/javascript" src= "Js/easytooltip.js" ></script><script type= "Text/javascript" src= "Js/jquery-ui-1.7.2.custom.min.js" ></script><!--End of Libraries--><div class= "logo" ><a href= "#" ></a></div><div id= "box" >Welcome to <font color= "Red" ><jsp:getproperty name= "Loginuser" property= "username"/></font>, Login successful!</div></div></body>

login_failure2.jsp page Source:

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding=" UTF-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" ><title>login_failure page </title><!--End of Page title--<!--Libraries--<link type= "Text/css" href= "Css/login.css" rel= "stylesheet"/><script type= "Text/javascript" src= "Js/jquery-1.3.2.min.js" ></script><script type= "Text/javascript" src= "Js/easytooltip.js" ></script><script type= "Text/javascript" src= "Js/jquery-ui-1.7.2.custom.min.js" ></script><!--End of Libraries--><div class= "logo" ><a href= "#" ></a></div><div id= "box" >Login failed! Please check the user or password!<br><a href= "loginbyservlet.jsp" > Back to login </a></div></div></body>

Operation Result:

Login success:

Login failed:

Java Web Learning (30): Implementing User Login with Jsp+servlet+javabean