Struts Application- Logic Tag Example

Struts Application- Logic Tag Example

Aim:

To perform logical operation in struts application using Logic tag.

< logic:empty >
< logic:notempty >
< logic:match >
< logic:notmatch >

All above mentioned tag have some common attributes name property.

But < logic:match > and < logic:notmatch > have additional attributes that is value.

Procedure:

Step_1:

Create actionforms(I have used actionforms name as logicforms).

Step_2:

Create actions(I have used actin name as logicactions).

Step_3:

Create jsp files

A). Home.jsp

B). success.jsp

Step_4:

Made changes in struts-config.xml

Step_5:

Run Home.jsp

Explain:

Step_1:

Create actionforms

Already I have explained how to create actionforms. You follow that rules.

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 logicforms extends org.apache.struts.action.ActionForm
{

private String name;

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

}


Step_2:

Create action

I have already explained how to create action.

package actions;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class logicactions extends org.apache.struts.action.Action
{


public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception
{

return mapping.findForward("success");
}
}

Step_3:

Create jsp files.

A) Home.jsp

< %@taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" % >
< %@taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" % >
< %@taglib uri="/WEB-INF/struts-html.tld" prefix="html" % >

< html >
< head >

< title > JSP Page < /title >
< /head >
< body >

< html:form action="/logic" >

< html:text property="name"/ >

< html:submit value="OK"/ >

< /html:form >

< /body >

< /html >


B). success.jsp

< %@taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" % >
< %@taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" % >
< %@taglib uri="/WEB-INF/struts-html.tld" prefix="html" % >

< html >
< head >

< title > JSP Page < /title >
< /head >
< body >

< logic:empty property="name" name="logicforms" >
I am in logic:empty Tag.
< /logic:empty >
< br >
< logic:notEmpty property="name"name="logicforms" >
I am in logic:notEmpty Tag.
< /logic:notEmpty >
< br >
< logic:match property="name" value="suresh" name="logicforms" >
Hello Suresh
< /logic:match >
< br >
< logic:notMatch name="logicforms" property="name" value="sures" >
Hello! da ! You aer not match
< /logic:notMatch >
< /body >
< /html >


Step_4:

Made changes in struts-config.xml

< action-mappings >

< action input="/" name="logicforms" path="/logic" scope="session" type="actions.logicactions" >
< forward name="success" path="/jsp/success.jsp"/ >
< /action >

< /action-mappings >


Step_5:

Run Home.jsp

Conclusion:

From this tag we have learnt the logic:empty,logic:notempty , logic:match, logic:notmatch.

You have any doubt please post comment. I clarify your doubt.