Not able to show error message when user-id filed is empty

[Neha Bhargava]

HI,

I am trying to code a simple user-id and login webpage in struts. I need to
show error message when user-id or password field is left blank.

LoginAction.java:

package com.example.action;

import com.example.form.*;
import org.apache.struts.action.Action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
//import org.apache.struts.action.ActionErrors;
//import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.ActionForward;

public class LoginAction extends Action 
{
public ActionForward execute(ActionMapping mapping,ActionForm
form,HttpServletRequest request,HttpServletResponse response) throws
Exception
{
        LoginForm form1 = (LoginForm)form;
        if(form1.getuserName().equals(form1.getpassword()))
        {
        return mapping.findForward("success");
        }
        else
        {
        return mapping.findForward("failure");
        }
}
}

LoginForm.java:

package com.example.form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.ActionMessage;
import com.example.*;


public class LoginForm extends ActionForm 
{
private static final long serialVersionUID = -473562596852452021L; 

private String userName= null;
private String password= null;

public void setuserName(String userName)
{
        this.userName=userName;
}

public String getuserName()
{
        return userName;
}

public void setpassword(String password)
{
        this.password=password;
}

public String getpassword()
{
        return password;
}

public void reset(ActionMapping mapping ,HttpServletRequest request)
{
        this.userName=null;
        this.password=null;
}

public ActionErrors validate(ActionMapping mapping ,HttpServletRequest
request)
{
        ActionErrors errors = new ActionErrors();
        if(userName==null && userName.length()==0)
        {
        errors.add("userName", new ActionMessage("error.userName.required"));   
        }
        if(password==null && password.length()==0)
        {
    errors.add("password", new ActionMessage("error.password.required"));
        }
        return errors;
}


}


Below is the code that I am using in MessageResources.properties file: 

error.userName.required = User Name is mandatory
error.password.required = Password is mandatory


ResourceManager.java:

package com.example;

import java.util.ResourceBundle;

public class ResourceManager 
{
    private static ResourceBundle
bundle=ResourceBundle.getBundle("com.example.MessageResources");

    public static String getString(String key){
              return bundle.getString(key);
    }   
}


Struts-config.xml:

<?xml version="1.0" encoding="UTF-8"?>
&lt;!DOCTYPE struts-config SYSTEM &quot;struts-config_1_0.dtd&quot; &gt;
<struts-config>

<form-beans>
<form-bean name= "LoginForm" type ="com.example.form.LoginForm"/>
</form-beans>

<global-exceptions></global-exceptions>

<global-forwards></global-forwards>

<action-mappings>
<action path="/Login" 
        type="com.example.action.LoginAction"
        name="LoginForm"
        scope="session"
        validate="true"
        input="login.jsp">
   <forward name="success" path="/jsp/firstScreenSuccess.jsp"/>
   <forward name="failure" path="/jsp/firstScreenFailure.jsp"/>
</action>        
</action-mappings>

<message-resources parameter="com.example.form.MessageResources"/>

</struts-config>


Web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";>
        <display-name>SecondStrutsApplication</display-name>
        
            <servlet>
        <servlet-name>action</servlet-name>
       
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>3</param-value>
        </init-param>
        <init-param>
             <param-name>detail</param-name>
             <param-value>3</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
        
        <welcome-file-list>
                <welcome-file>jsp/login.jsp</welcome-file>
    </welcome-file-list>
    
    <taglib>
    <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
    <taglib-location>/WEB-INF/tlds/struts-html.tld</taglib-location>
    </taglib>
    
    <taglib>
    <taglib-uri>http://struts.apache.org/tags-bean</taglib-uri>
    <taglib-location>/WEB-INF/tlds/struts-bean.tld</taglib-location>
    </taglib>
</web-app>


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