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logic and bean tag in struts

Swapna latha
Ranch Hand

Joined: Dec 18, 2011
Posts: 70
register.jsp

<%@taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<html:form action="register">
UserName:<html:text property="username"/> <br>
Password: <html:password property="password"/> <br>
<html:submit value="register"/>
</html:form>
<logic:notEmpty name="resultmsg">
Result is: <bean:write name="resultmsg"/>
</logic:notEmpty>


RegisterAction.java

package surya;
import org.apache.struts.action.*;
import javax.servlet.http.*;
public class RegisterAction extends Action
{
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest req, HttpServletResponse res) throws Exception
{
System.out.println("Action class execute() is called");
RegisterForm fm=(RegisterForm)form;
String uname=fm.getUsername();
String pwd=fm.getPassword();
if(uname.equals("Sathya")&&pwd.equals("tech"))
{req.setAttribute("resultmsg","validcredentials");

}
else
{
req.setAttribute("resultmsg","Invalidcredentials");

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


Whats the use of bean and logic tags here ? I am not getting the correct idea.
Raaja Gotluru
Ranch Hand

Joined: Mar 02, 2010
Posts: 115
Hi Swapna,

The code between logic tag executes only when the tag evaluates to true.



In the above code the value of the bean resultmsg will be diplayed only when the bean resultmsg is not null or when the bean is having some value.
candid java
Greenhorn

Joined: Jan 13, 2012
Posts: 14
here i was found the exact answer by this link http://candidjava.com/struts-1x-validation-with-example-program-in-eclipse
 
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