Struts & Hibernate Integration :

Struts integration with Hibernate using Struts1.2/1.3 framework needs a bit of extra work because sturs1.2/1.3 form beans are not POJO classes. As we know hibernate works with POJO's.Here we create separate POJO class for holding persisting data. This POJO object is populated with the form data which is available in the struts form bean.

One more important point here is the creation of a Hibernate Session .We have different approaches for creating Hibernate Session like using Plug-In,separate Utility class or embedding directly in to the code.Each way has its pros and cons.

If we use the Plug-In for creating Hibernate Session it is better to place the Hibernate Session Object in the Application Scope so that any struts action that wants hibernate session can easily get it.From the coding point of view the Plug in class has to implement the plug-in interface.The plig-in class has to be mentioned in the web.xml using plug-in tags.

For the sake of simplicity i used the Utility class for creating hibernate session.In the following code sample.

Code of: hinernate.cnf

Hibernate Mapping File : SignUp.hbm

<!-- <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net /hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class dynamic-insert="false" dynamic-update="false" mutable="true" name="signup.SignUp" optimistic-lock="version" polymorphism="implicit" select-before-update="false" table="SIGNUP"> <id column="UID" name="uid"> <generator class="increment"/> </id> <property column="FIRST_NAME" name="firstName"/> <property column="MIDDLE_NAME" name="middleName"/> <property column="LAST_NAME" name="lastName"/> <property column="USER_NAME" name="userName"/> <property column="USER_PASSWORD" name="password"/> <property column="PRESENT_ADDRESS" name="presentAddress"/> <property column="PERMANENT_ADDRESS" name="permanentAddress"/> <property column="CONTACT_NUMBER" name="contactNumber"/> </class> </hibernate-mapping> -->

Persistence POJO class: SignUp.java

package signup; import java.io.Serializable; /** * * @author Murali */ public class SignUp implements Serializable { private int uid; private String firstName; private String middleName; private String lastName; private String userName; private String password; private String presentAddress; private String permanentAddress; private String contactNumber; public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } /** * Get the value of contactNumber * * @return the value of contactNumber */ public String getContactNumber() { return contactNumber; } /** * Set the value of contactNumber * * @param contactNumber new value of contactNumber */ public void setContactNumber(String contactNumber) { this.contactNumber = contactNumber; } /** * Get the value of permanentAddress * * @return the value of permanentAddress */ public String getPermanentAddress() { return permanentAddress; } /** * Set the value of permanentAddress * * @param permanentAddress new value of permanentAddress */ public void setPermanentAddress(String permanentAddress) { this.permanentAddress = permanentAddress; } /** * Get the value of presentAddress * * @return the value of presentAddress */ public String getPresentAddress() { return presentAddress; } /** * Set the value of presentAddress * * @param presentAddress new value of presentAddress */ public void setPresentAddress(String presentAddress) { this.presentAddress = presentAddress; } /** * Get the value of password * * @return the value of password */ public String getPassword() { return password; } /** * Set the value of password * * @param password new value of password */ public void setPassword(String password) { this.password = password; } /** * Get the value of userName * * @return the value of userName */ public String getUserName() { return userName; } /** * Set the value of userName * * @param userName new value of userName */ public void setUserName(String userName) { this.userName = userName; } /** * Get the value of lastName * * @return the value of lastName */ public String getLastName() { return lastName; } /** * Set the value of lastName * * @param lastName new value of lastName */ public void setLastName(String lastName) { this.lastName = lastName; } /** * Get the value of middleName * * @return the value of middleName */ public String getMiddleName() { return middleName; } /** * Set the value of middleName * * @param middleName new value of middleName */ public void setMiddleName(String middleName) { this.middleName = middleName; } /** * Get the value of firstName * * @return the value of firstName */ public String getFirstName() { return firstName; } /** * Set the value of firstName * * @param firstName new value of firstName */ public void setFirstName(String firstName) { this.firstName = firstName; } }

Source Code for Untility Class: HibernateUtil.java

package com.myapp.struts; import org.hibernate.cfg.Configuration; import org.hibernate.SessionFactory; /** * Hibernate Utility class with a convenient method to get * Session Factory object. * * @author Murali */ public class HibernateUtil { private static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from standard // (hibernate.cfg.xml) config file. sessionFactory = new Configuration().configure() .buildSessionFactory(); } catch (Throwable ex) { // Log the exception. System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }

Persistence logic is separated through DAO pattern .Following is the code for login & SignUp DAO's

Code for LoginDAO.java

Code for SignUpDAO

Login Business Logic is seperated through BO pattern.Following is the code for Logic and SignUp BO's .Interfaces are used to provode the loose coupling

Code for iLoginBO interface

Code for LoginBOimpl this calss implements the iLoginBO interface

Code for iSignUpBO interface

Code for SignBOimpl

Code for SignUpAction class

package com.myapp.struts; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionForward; import signup.SignUp; import bo.SignUpBOimpl; import bo.iSignUpBO; /** * * @author Murali */ public class SignUpAction extends org.apache.struts.action.Action { private final static String SUCCESS = "success"; private final static String CANCEL = "cancel"; SignUp signUpObject = new SignUp(); /** * This is the action called from the Struts framework. * @param mapping The ActionMapping used to select this instance. * @param form The optional ActionForm bean for this request. * @param request The HTTP Request we are processing. * @param response The HTTP Response we are processing. * @throws java.lang.Exception * @return */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { SignUpFormBean signUpFormObeject = (SignUpFormBean) form; signUpObject.setFirstName(signUpFormObeject.getFirstName()); signUpObject.setMiddleName(signUpFormObeject.getMiddleName()); signUpObject.setLastName(signUpFormObeject.getLastName()); signUpObject.setUserName(signUpFormObeject.getUserName()); signUpObject.setPassword(signUpFormObeject.getPassword()); signUpObject.setPresentAddress(signUpFormObeject.getPresentAddress()); signUpObject.setPermanentAddress(signUpFormObeject.getPermanentAddress()); signUpObject.setContactNumber(signUpFormObeject.getContactNumber()); iSignUpBO signUpBOObject = new SignUpBOimpl(); signUpBOObject.userSignUp(signUpObject); if (isCancelled(request)) { return mapping.findForward(CANCEL); } return mapping.findForward(SUCCESS); } }

Code For LoginAction Class

For technical support please contact me at

murali@javamission.com