package c1;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

public class LoginActionForm extends ActionForm {

  private String username;
  
  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }


  @Override
  public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {
    if ("".equals(this.getUsername()) || this.username == null) {
      ActionErrors ae = new ActionErrors();
      ActionMessage am = new ActionMessage("error.eng");
      ae.add("username", am);
      return ae;
    } else {
      return super.validate(mapping, request);
    }
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config SYSTEM "struts-config_1_1.dtd">
<struts-config>
  <form-beans>
    <form-bean name="login" type="c1.LoginActionForm"></form-bean>
  </form-beans>
  <action-mappings>
    <action path="/c1/main" name="login" type="c1.LoginAction" input="/c1/test1.jsp" validate="true">
      
    </action>
  </action-mappings>
  <message-resources parameter="resource"></message-resources>
</struts-config>