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    DispatchAction

    DispatchAction is another useful built-in Struts Action.Use DispatchAction when a set of actions is closely related and separating them into multiple Actions would result in duplication of code. 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. DispatchAction is the answer to this problem. With DispatchAction, you can combine all three Actions into one.

    Follow the below five steps to setup DispatchAction.

    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:link page="/emp/empaction.do?step=delete&emp_id=1" />
    <html:link page="/emp/empaction.do?step=activate&emp_id=1" />
    <html:link page="/emp/empaction.do?step=deactivate&emp_id=1" />
    </html:form>

    Step 2. 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 3. 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 4. In the Action class.

    public class EmpAction extends DispatchAction {
    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 5. 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/app/jsp/empdetails.jsp

    In the above example DispatchAction was used handle hyperlinks. DispatchAction is a good choice when there are form submissions using the regular buttons . Just name all the buttons same. <html:submit property="step">Delete</html:submit> <html:submit property="step">Activate</html:submit> <html:submit property="step">Deactivate</html:submit>

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