Purpose:
Org.apache.struts.actions.LookUpDispatchAction is a built in action in struts framework.
This class enables a user to perform different task using a single action class. It eliminate for creating multiple action class for each task.
DispatchAction and LookupDispatchAction are same But LookupDispatchAction uses java Map interface and ApplicationResources.properties to dispatch method.
Procedure:
Step_1:
Creating action class.
When you create action class you select configuration file into
org.apache.struts.actions.LookupDispatchAction
package actions;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.actions.LookupDispatchAction;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
import java.util.*;
public class lookAction extends LookupDispatchAction
{
protected Map getKeyMethodMap()
{
Map map = new HashMap();
map.put("suresh.one", "one");
map.put("suresh.two", "two");
map.put("suresh.three", "three");
return map;
}
public ActionForward one(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws java.lang.Exception
{
return mapping.findForward("one");
}
public ActionForward two(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
{
return mapping.findForward("two");
}
public ActionForward three(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws java.lang.Exception
{
return mapping.findForward("three");
}
}
Step_2:
Creating actionform class.
You create action form class . where you insert setter and getter method for method;
Private String method;
package actionforms;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
public class lookForm extends org.apache.struts.action.ActionForm
{
private String method;
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
}
Step_3:
Made some change in ApplicationResources.properties.
Add below code.
suresh.one=one
suresh.two=two
suresh.three=three
Step_4:
Made change in Struts-congif.xml
< action-mappings >
< action
input="/"
name="lookForm"
path="/look"
scope="session"
validate="false"
parameter="method"
type="actions.lookAction" >
< forward name="one" path="/jsp/one.jsp"/ >
< forward name="two" path="/jsp/two.jsp"/ >
< forward name="three" path="/jsp/three.jsp"/ >
< /action>
< /action-mappings >
Step_5:
Creating jsp file for look.jsp
< %@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" % >
< %@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" % >
< %@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" % >
< html >
< head > < title > JSP Page < /title>
< /head >
< body >
< html:form action="/look.do?method=one" >
< html:submit value="one"/ >
< /html:form >
< html:form action="/look.do?method=two" >
< html:submit value="two"/ >
< /html:form >
< html:form action="/look.do?method=three" >
< html:submit value="three"/ >
< /html:form >
< /body >
< /html >
Step_6:
Create one.jsp and two.jsp and three.jsp.
Step_7:
Run look.jsp
Right click on look.jsp and run the file. Or Shift+f6.
Note: You have any doubt. Give comments. You give your email address in comments. I shall workspace for the struts project to your email address.
