Declarative validation example

When ever we deploy this program in any server this program we used Declarative validation logic those validation declare in validation.xml files under of tags. We declare form bean names, fields property depends with the help of ApplicationResources.properties file this generate any errors messages again with the help of tags in jsp pages it display errors messages.

Index.jsp

&lt;%@page contentType="text/html"%&gt;
&lt;%@page pageEncoding="UTF-8"%&gt;

&lt;%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %&gt;
&lt;%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %&gt;
&lt;%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %&gt;

<html:html locale="true">
    
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>&lt;bean:message key="welcome.title"/&gt;</title>
        <html:base>
    

    
        <center>
            <html:form action="/login">
                    username : <html:text property="username"><html:errors property="username">
                    password : <html:password property="password"><html:errors property="password">

                    <html:submit><html:cancel>
                </html:cancel></html:submit></html:errors></html:password></html:errors></html:text></html:form>

<table>
                
</table>


        </center>
    

</html:base></html:html>

<%@page contentType="text/html"%>

<%@page pageEncoding="UTF-8"%>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %>

<html:html locale="true">

<html:base>

<html:form action="/login">

username : <html:text property="username"><html:errors property="username">

password : <html:password property="password"><html:errors property="password">

<html:submit><html:cancel>

</html:cancel></html:submit></html:errors></html:password></html:errors></html:text></html:form>

<table>

</table>

</center>

</html:base></html:html>

Success.jsp

&lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt;



    
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    
    


<h1>success!</h1>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<h1>success!</h1>

Fail.jsp

&lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt;



    
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    
    


<h1>fail!</h1>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

Web.xml

<!--?xml version="1.0" encoding="UTF-8"?-->
<web-app 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">
    <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>2</param-value>
        </init-param>
        <init-param>
            <param-name>detail</param-name>
            <param-value>2</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
        </servlet>
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>
    <jsp-config>
        <taglib>
            <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
        </taglib>
        <taglib>
            <taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>
            <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
        </taglib>
        </jsp-config>
    </web-app>

<web-app 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">

<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>2</param-value>

</init-param>

<init-param>

<param-name>detail</param-name>

<param-value>2</param-value>

</init-param>

<load-on-startup>2</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>action</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>

</session-timeout>

</session-config>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<jsp-config>

<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>

</taglib>

<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-html.tld</taglib-location>

</taglib>

<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>

</taglib>

<taglib-uri>/WEB-INF/struts-nested.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>

</taglib>

<taglib-uri>/WEB-INF/struts-tiles.tld</taglib-uri>

<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>

</taglib>

</jsp-config>

</web-app>

Struts-config.xml

<!--?xml version="1.0" encoding="UTF-8" ?-->




<struts-config>
    <form-beans>
        <form-bean name="LoginForm" type="com.myapp.struts.LoginForm">
    
    </form-bean></form-beans>
    
    <global-exceptions>
    
    </global-exceptions>

    <global-forwards>
        <forward name="welcome" path="/Welcome.do">
    </forward></global-forwards>

    <action-mappings>
        <action input="/index.jsp" name="LoginForm" path="/login" scope="request" type="com.myapp.struts.LoginAction" validate="true">
        <forward name="success" path="/success.jsp">
       <forward name="fail" path="/fail.jsp">
       </forward></forward></action>
    </action-mappings>
    
    <controller processorclass="org.apache.struts.tiles.TilesRequestProcessor">

    <message-resources parameter="com/myapp/struts/ApplicationResource">    
    
    <!-- ========================= Tiles plugin ===============================-->
  
    <plug-in classname="org.apache.struts.tiles.TilesPlugin">
        <set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml">      
        <set-property property="moduleAware" value="true">
    </set-property></set-property></plug-in>
    
    <!-- ========================= Validator plugin ================================= -->
    <plug-in classname="org.apache.struts.validator.ValidatorPlugIn">
        <set-property property="pathnames" value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml">
    </set-property></plug-in>
  
</message-resources></controller></struts-config>

<struts-config>

<form-beans>

<form-bean name="LoginForm" type="com.myapp.struts.LoginForm">

</form-bean></form-beans>

<global-exceptions>

</global-exceptions>

<global-forwards>

</forward></global-forwards>

<action-mappings>

</forward></forward></action>

</action-mappings>

<message-resources parameter="com/myapp/struts/ApplicationResource">

<plug-in classname="org.apache.struts.tiles.TilesPlugin">

<set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml">

<set-property property="moduleAware" value="true">

</set-property></set-property></plug-in>

<plug-in classname="org.apache.struts.validator.ValidatorPlugIn">

<set-property property="pathnames" value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml">

</set-property></plug-in>

</message-resources></controller></struts-config>

Validation.xml

<!--?xml version="1.0" encoding="UTF-8" ?-->



<form-validation>

<!--
     This is a minimal Validator form file with a couple of examples.
-->

    <global>

        <!-- An example global constant
        <constant>
            <constant-name>postalCode</constant-name>
            <constant-value>^\d{5}\d*$</constant-value>
        </constant>
        end example-->

    </global>

    <formset>

        <!-- An example form -->
        <form name="LoginForm">
            <field property="username" depends="required,username">
                    <arg key="LoginForm.username">
            </arg></field>
            <field property="password" depends="required,mask">
                    <arg key="LoginForm.password">
                    <var>
                        <var-name>mask</var-name>
                        <var-value>^[0-9a-zA-Z]*$</var-value>
                    </var>
            </arg></field>
        </form>

    </formset>

    <!-- An example formset for another locale -->
  </form-validation>

<form-validation>

<!--

This is a minimal Validator form file with a couple of examples.

-->

<!-- An example global constant

<constant-name>postalCode</constant-name>

<constant-value>^\d{5}\d*$</constant-value>

</constant>

end example-->

</global>

</arg></field>

<var>

<var-name>mask</var-name>

<var-value>^[0-9a-zA-Z]*$</var-value>

</var>

</arg></field>

</form>

</formset>

</form-validation>

ApplicationResources.properties

# -- standard errors --
errors.header=

<ul>
errors.prefix=

 	<li>
errors.suffix=</li>


errors.footer=</ul>


# -- validator --
errors.invalid={0} is invalid.
errors.maxlength={0} can not be greater than {1} characters.
errors.minlength={0} can not be less than {1} characters.
errors.range={0} is not in the range {1} through {2}.
errors.required={0} is required.
errors.byte={0} must be an byte.
errors.date={0} is not a date.
errors.double={0} must be an double.
errors.float={0} must be an float.
errors.integer={0} must be an integer.
errors.long={0} must be an long.
errors.short={0} must be an short.
errors.creditcard={0} is not a valid credit card number.
errors.email={0} is an invalid e-mail address.
# -- other --
errors.cancel=Operation cancelled.
errors.detail={0}
errors.general=The process did not complete. Details should follow.
errors.token=Request could not be completed. Operation is not in sequence.
# -- welcome --
welcome.title=Struts Application
welcome.heading=Struts Applications !
welcome.message=It's easy to create Struts applications.
username=username.
password=password.

# -- standard errors --

errors.header=

<ul>

errors.prefix=

<li>

errors.suffix=</li>

errors.footer=</ul>

# -- validator --

errors.invalid={0} is invalid.

errors.maxlength={0} can not be greater than {1} characters.

errors.minlength={0} can not be less than {1} characters.

errors.range={0} is not in the range {1} through {2}.

errors.required={0} is required.

errors.byte={0} must be an byte.

errors.date={0} is not a date.

errors.double={0} must be an double.

errors.float={0} must be an float.

errors.integer={0} must be an integer.

errors.long={0} must be an long.

errors.short={0} must be an short.

errors.creditcard={0} is not a valid credit card number.

errors.email={0} is an invalid e-mail address.

# -- other --

errors.cancel=Operation cancelled.

errors.detail={0}

errors.general=The process did not complete. Details should follow.

errors.token=Request could not be completed. Operation is not in sequence.

# -- welcome --

welcome.title=Struts Application

welcome.heading=Struts Applications !

welcome.message=It's easy to create Struts applications.

username=username.

password=password.

LoginAction.java

package com.myapp.struts;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;

public class LoginAction extends org.apache.struts.action.Action {
    
      private final static String SUCCESS = "success";
      public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        
        LoginForm lf=(LoginForm)form;
        String username=lf.getUsername();
		String password=lf.getPassword();

       if(username.equals("anurag")&amp;&amp;password.equals("singh"))

			return mapping.findForward("success");
		else

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

package com.myapp.struts;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionForward;

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

private final static String SUCCESS = "success";

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

LoginForm lf=(LoginForm)form;

String username=lf.getUsername();

String password=lf.getPassword();

if(username.equals("anurag")&&password.equals("singh"))

return mapping.findForward("success");

else

return mapping.findForward("fail");

}

LoginForm.java

package com.myapp.struts;

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 LoginForm extends org.apache.struts.action.ActionForm {
    
   private String username;

    public String getPassword() {
        return password;
    }

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

    public String getUsername() {
        return username;
    }

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

    private String password;
    
}

package com.myapp.struts;

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

private String username;

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

private String password;

}