Using Struts2 and Hibernate

• How to use Struts2
• How to use Hibernate with Annotations
• How to use Data Access Object design pattern

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <session-config>
        <session-timeout>10</session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>registeruser.jsp</welcome-file>
    </welcome-file-list>
</web-app>

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="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
    <property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
    <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
    <property name="hibernate.connection.username">hr</property>
    <property name="hibernate.connection.password">hr</property>
    <property name="hibernate.hbm2ddl.auto">create</property>
    <mapping class="entities.User"/>
  </session-factory>
</hibernate-configuration>

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>
    <package name="default" extends="struts-default">
        <action  name="register" class="actions.RegisterAction">
            <result name="success">registercomplete.jsp</result>
            <result name="fail">registerfail.jsp</result>
        </action>
    </package>
</struts>

User class

This is placed in WEB-INF/classes/entities folder.

package entities;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table (name="users")
public class User {
    @Id
    @GeneratedValue ( strategy =  GenerationType.AUTO)
    private int userid;
    private String email;
    private String password;

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getUserid() {
        return userid;
    }
    
    public void setUserid(int userid) {
        this.userid = userid;
    }
}

HibernateUtil class

package dao;

import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.SessionFactory;

public class HibernateUtil {
    private static final SessionFactory sessionFactory;

    static {
        try {
            sessionFactory = 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;
    }
}

UserDAO class

package dao;

import entities.User;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;


public class UserDAO {

    public static boolean registerUser(User u) {

         SessionFactory sf = HibernateUtil.getSessionFactory();
         Transaction t = null;
         try  {
         Session s  = sf.openSession();
         t = s.beginTransaction(); // start a new transaction
         s.persist(u);
         t.commit();  // commit transaction  
         return true;
         }
         catch(Exception ex) {
             System.err.println("Error -->"  + ex.getMessage());
             if ( t!=null) t.rollback();  // rollback transaction on exception 
             return false;
         }
    }
}

RegisterAction class

package actions;

import dao.UserDAO;
import entities.User;

public class RegisterAction {

    private String email,pwd;

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public RegisterAction() {
    }

    public String execute() throws Exception {
        
        // create an object of User entity
        User u = new User();
        u.setEmail(email);
        u.setPassword(pwd);
        
        if ( UserDAO.registerUser(u))   // Access persistence tier through DAO
             return "success";
        else
            return "fail";
    }
}

registeruser.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>

<html>
    <head>
       <title>User Registration </title>
    </head>
    <body>
        <h2>User Registration</h2>
        <s:form action="register">
            <s:textfield name="email" label="Enter email address : "/>
            <s:password name="pwd" label="Enter your password : " />
            <s:submit value="Register" />
        </s:form>
    </body>
</html>

registercomplete.jsp and registerfail.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
    <body>
        <h1>Registration Completed Successfully!</h1>
    </body>
</html>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
    <body>
        <h1>Registration Failed!</h1>
        <a href="registeruser.jsp">Try Again </a>
    </body>
</html>

Directory Hierarchy

struts2hibernate
    registeruser.jsp
    registercomplete.jsp
    registerfail.jsp
    WEB-INF
        web.xml
        classes
           hibernate.cfg.xml
           struts.xml
           entities
              User.class
           dao
              HibernateUtil.class
              UserDAO.class
           actions
              RegisterAction.class
        lib
            oracle driver
            struts2 related jar files
            Hibernate related jar files

Deploy the application to any Java EE Web Container (such as Tomcat) and invoke registeruser.jsp from brower. Enter data into text boxes and click on submit button to insert a row into users table in Oracle database.

Post Your Comment

Enter the code given in the above image :