Objective
We will create a Web application of login based on Struts 2 framework in Eclipse:
- a login page enabling to enter username/password, a submit button
- when the submit button is clicked, the server receives the username/password and verifies it from the DB on the server (using Hibernate).
- if the login is success, a success page will appear
- otherwise, a failure page is displayed.
Project development
Create a project (to see how to create a Web project and download Struts 2 library, please see:
http://coderandcode.blogspot.com/2013/10/helloworld-simple-web-application-with.html) with folders and files in the project directory as follow:
- in the src folder, create two packages: control and model. In package
control, create two java classes of name LoginAction and HibernateUser. In package model,
create a java class of name User.
- add a resource folder into project directory and create files: ApplicationResources.properties, hibernate.cfg.xml, user.hbm.xml
- in the WebContent folder, create two JSP pages: login and success.
- in the WebContent/WEB-INF/ folder, create a file web.xml
- in the WebContent/WEB-INF/classes folder, create a file struts.xml
- On the database level, create a database named "hotelmanagement" which contains a table users as follow:
We now have to define all java classes, jsp pages, .properties and .xml file
User.java (A POJO class)
package model;
import java.io.Serializable;
public class User implements Serializable{
private static final long serialVersionUID = 1L;
private Integer id;
private String username;
private String password;
private String fullName;
private String idCardNumber;
private String idCardType;
private String address;
private String description;
public User(){
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public String getIdCardNumber() {
return idCardNumber;
}
public void setIdCardNumber(String idCardNumber) {
this.idCardNumber = idCardNumber;
}
public String getIdCardType() {
return idCardType;
}
public void setIdCardType(String idCardType) {
this.idCardType = idCardType;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
HibernateUser.java
package control;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import model.User;
public class HibernateUser{
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
return new AnnotationConfiguration().configure()
.buildSessionFactory();
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public boolean checkLogin(User user){
boolean result = false;
Session session = this.getSessionFactory().getCurrentSession();
session.beginTransaction();
List<User> users = null;
String sql = "
FROM User U WHERE U.username = :username AND U.password = :password";
try {
Query q = session.createQuery(sql);
q.setParameter("username", user.getUsername());
q.setParameter("password", user.getPassword());
users = (List<User>)
q.list();
if (users.size() > 0) result = true;
} catch (HibernateException e) {
e.printStackTrace();
session.getTransaction().rollback();
}
session.getTransaction().commit();
return result;
}
}
LoginAction.java
package control;
import model.User;
import com.opensymphony.xwork2.ActionSupport;
public class LoginAction
extends ActionSupport{
private static final long serialVersionUID = 2L;
private User userBean;
public String execute() throws Exception {
HibernateUser hu = new HibernateUser();
if (hu.
checkLogin(userBean)) {
return "success";
} else {
addActionError(getText("error.login"));
return "input";
}
}
public void validate(){
//The addFieldError method takes two arguments.
//The first is the form field name to which the error applies
//and the second is the error message to display above that form field.
if ( userBean.getUsername().length() == 0 ){
addFieldError( "userBean.username", "Username is required." );
}
if ( userBean.getPassword().length() == 0 ){
addFieldError( "userBean.password", "Password is required." );
}
}
public User getUserBean() {
return userBean;
}
public void setUserBean(User userBean) {
this.userBean = userBean;
}
}
ApplicationResources.properties
label.username= Username
label.password= Password
label.login= Login
error.login = Username and password incorrect! Try again...
hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="
connection.driver_class"> com.mysql.jdbc.Driver </property>
<property name="
connection.url">jdbc:mysql://localhost:3306/hotelmanagement </property>
<property name="
connection.username">root</property>
<property name="
connection.password">12345678</property>
<property name="connection.pool_size">1</property>
<property name="dialect"> org.hibernate.dialect.MySQLDialect </property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class"> org.hibernate.cache.NoCacheProvider </property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping resource="
user.hbm.xml"/>
</session-factory>
</hibernate-configuration>
user.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="model.User" table="tbluser" >
<id name="id" type="int" column="id" > <generator class="native"/> </id>
<property name="username"> <column name="username" /> </property>
<property name="password"> <column name="password"/> </property>
<property name="fullName"> <column name="fullName" /> </property>
<property name="idCardNumber"> <column name="idCardNumber"/> </property>
<property name="idCardType"> <column name="idCardType" /> </property>
<property name="address"> <column name="address"/> </property>
<property name="description"> <column name="description" /> </property>
</class>
</hibernate-mapping>
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%><html>
<head>
<title>Struts 2 - Login Application</title>
</head>
<body>
<h2>Struts 2 - Login Application</h2>
<
s:actionerror />
<
s:form action="login" method="post">
<
s:textfield name="userBean.username" key="label.username" size="20" />
<
s:password name="userBean.password" key="label.password" size="20" />
<
s:submit method="execute" key="label.login" align="center" />
</s:form>
</body>
</html>
success.jsp
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Welcome</title>
</head>
<body>
<h2>Hi, <
s:property value="userBean.username" />!</h2>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app
id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Struts Blank</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>
/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>
login.jsp</welcome-file>
</welcome-file-list>
</web-app>
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<constant name="struts.custom.i18n.resources" value="ApplicationResources" />
<package name="basicstruts2" extends="struts-default">
<action name="index">
<result>
/login.jsp</result>
</action>
<
action name="login" class="control.LoginAction" method="execute">
<result name="
success">/success.jsp</result>
<result name="
input">/login.jsp</result>
</action>
</package>
</struts>
Results
- login page:
- success page:
