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Hibernate

  1. Advantage of Hibernate over JDBC

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  6. One to Many Relation in Hibernate

  7. One to Many Relation in Hibernate bi-directional

  8. Many to Many Relation in Hibernate

  9. HQL: The Hibernate Query Language

  10. Criteria Queries

  11. Criteria Queries : Equal (eq), Not Equal(ne), Less than (le), greater than (gt),greater than or equal(ge) and Ordering the results

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  14. prevent concurrent update in Hibernate,slate object updatation in Hibernate,version checking in Hibernate

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  1. Model View Controller (MVC)

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  5. Message Resources

  6. Validation Framework

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  8. ForwardAction

  9. IncludeAction

  10. DispatchAction

  11. LookupDispatchAction

  12. DynaActionForm

  13. DynaActionForm

  14. Struts Tutorial - Mutli-click prevention using struts tokens-Prevent Duplicate Submission

  15. Logic Iterate Map and List


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  1. Spring Tutorial

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  5. Introduction to BeanFactory

  6. Dependency Injection in Spring

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  9. Spring IOC Setup Step by Step

  10. Bean Lifecycle in Spring

  11. ApplicationContext

  12. MessageSources in Spring

  13. Web Spring MVC framework

  14. Developing Your First Spring Web Application

  15. Developing Your Second Spring Web Application with Spring Form

  16. Developing Your First Spring Web Application with Spring Validation Framework with Code Example

  17. Spring integration with Hibernate

 LookupDispatchAction

LookupDispatchAction is another useful built-in Struts Action. When a set of actions is closely related and separating them into multiple Actions would result in duplication of code you can use LookupDispatchAction. LookupDispatchAction is subclass of DispatchAction.
In case of DispatchAction, you have to declare the method name in the JSP page.
For Example :
http://localhost:8080/emp/empaction.do?step=add // IN CASE OF DispatchAction
here step=add , we are delaring method name in JSP.
or
<html:submit property="step">Add</html:submit> //IN CASE OF DispatchAction
so we can't use localization for button in case of DispatchAction.
To over come both the issues below
a)method name declaration in JSP
b)can't use localization for button
We will go for LookupDispatchAction.

For example : If there are three operation like delete, activate, deactivate employee. You can create three different Actions –
ActivateEmpAction, DeleteEmpAction and DeActivateEmpAction.
This is a valid approach, although not elegant since there might be duplication of code across the Actions since they are related. LookupDispatchAction is the answer to this problem. With LookupDispatchAction, you can combine all three Actions into one.

Follow the below six steps to setup LookupDispatchAction.

Step 1. In the JSP page (empdetails.jsp)

<%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<html:form>
<html:form action="/saveEmp" method="post">
<html:submit property="step">
<bean:message key="button.activate"/>
</html:submit>
<html:submit property="step">
<bean:message key="button.delete"/>
</html:submit>
<html:submit property="step">
<bean:message key="button.deactivate"/>
</html:submit>
</html:form>

//No need method name declaration in JSP . Button name from resource bundle.

Step 2. In the the Resource Bundle. //Here you can add localization.

button.activate=Activate
button.delete=Delete
button.deactivate=DeActivate

Step 3. Adding ActionForm Entry in struts-config.xml

Add the following entry in the struts-config.xml file.

<form-bean name="EmpForm"   
         type="com.techfaq.form.EmpForm">
        
</form-bean>

Step 4. Add action mapping in the struts-config.xml file:

Add the following action mapping in the struts-config.xml file:

<action path="/empaction" type="com.techfaq.action.EmpAction"
     name="EmpForm"
     scope="request"
     validate="true"
     parameter="step"
     input="/jsp/empform.jsp">

    <forward name="delete-success" path="/jsp/deletesuccess.jsp"/>
    <forward name="activate-success" path="/jsp/activatesuccess.jsp"/>
    <forward name="deactivate-success" path="/jsp/deactivatesuccess.jsp"/>
    </action>

Step 5. In the Action class.

Implement a method named getKeyMethodMap() in the subclass of the LookupDispatchAction. The method returns a java.util.Map. The keys used in the Map should be also used as keys in Message Resource Bundle.

public class EmpAction extends LookupDispatchAction {
public Map getKeyMethodMap()
{
Map map = new HashMap();
map.put("button.activate", "activate");
map.put("button.delete", "delete");
map.put("button.deactivate", "deactivate");
}
public ActionForward activate(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception
{
//your logic
mapping.findForward("activate-success");
}
public ActionForward delete(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception
{
//your logic
mapping.findForward("delete-success");
} public ActionForward deactivate(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception
{ //your logic
mapping.findForward("deactivate-success");
}
}

Step 6. In the EmpForm

public class EmpForm extends ActionForm {
int empId;
String firstName;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public int getEmpId() {
return empId;
}
public void setEmpId(int empId) {
this.empId = empId;
}
}

Now in the browser type http://localhost:8080/jsp/empdetails.jsp

for every form submission, LookupDispatchAction does the reverse lookup on the resource bundle to get the key and then gets the method whose name is associated with the key from getKeyMethodmap().
Flow of LookupDispatchAction:
a) Form the button name "Delete" get the key "button.delete" fro resource bundle.
b) then in the Map getKeyMethodMap() find the value associated with the key "button.delete".
c) value from the Map is "delete" . then call delete() method of the same action class.
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