Class DynaValidatorForm

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1. Create DynaActionForm
There are 2 ways to create a dynaActionForm in Lomboz3.2. The first one is to use New -> Struts Form Bean -> Add New DynaForm -> Fill out Form Bean Name and add properties (Notice that in Lomboz3.2 there is a bug that when you add more than one properties, it will ONLY add the last one, so we have to add the other properties in struts-config.xml by hand.), check out Create Form Input Page and select Action. Another way to create a dynaActionForm is add code directly in struts-config.xml. This is because a dynaActionForm has no .java file. Code is like this:

<form-bean name="loginActionForm" type="org.apache.struts.validator.DynaValidatorForm">

<form-property name="username" type="java.lang.String"/>

<form-property name="password" type="java.lang.String"/>

</form-bean>

2. Create Action
Code in an action is most like that in a ordinary action file. The only diffience is the way to retrieve properties form the dynaActionForm.
The methods to get and set properties of a dynaActionForm are:

3. Add ValidatorPlugin into struts-config.xml

<struts-config>

...

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

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

<set-property property="stopOnFirstError" value="false" />

</plug-in>

</struts-config>

4. Create validation.xml and validator-rules.xml in folder WEB-INF
Creating validation.xml is a little complex, please refer to the example below. But when we create a struts project in lomboz3.2, it has create these two files atuomaticially. We need not to modify anthing about validator-rules.xml and only need to modify validation.xml to fit our purpose.

5. Add content in ApplicationResources.properties.
First we need to confirm that in struts-config.xml we have use ApplicationResources.properties as resource file.

<message-resources parameter="ApplicationResources"/>

Add needed resouce in ApplicationResources.properties:

#Info

label.username = username

label.password = password

#Error

errors.required={0} can not be null

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

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

errors.invalid={0} is invalid<li/>

6. Use Action in .jsp files.
There are two ways to report validation errors in .jsp files. The first way is to report errors in the .jsp files, and the other is to report using javascript. The first way is simple, add

<html:errors />

where you want the errors to show such below the tag <body>. To use javascript we need to add

onsubmit="return validateLoginActionForm(this)"

in the tag <html:form>(Notice that the method name is validate + form name = validateLoginActionForm), and we need to add

<html:javascript formName="loginActionForm"/>

between <html:form> and </html:form>.

A example:
1. Create DynaActionForm.
--------------------------------------------------------------
struts.config.xml

<form-beans>

<form-bean name="loginActionForm" type="org.apache.struts.validator.DynaValidatorForm">

<form-property name="username" type="java.lang.String"/>

<form-property name="password" type="java.lang.String"/>

</form-bean>

</form-beans>

2. Create Action
-------------------------------------------------
loginAction.java
--------------------

package login;

import java.io.IOException;

import java.util.ArrayList;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.struts.action.*;

import org.apache.struts.validator.*;

public class loginAction extends Action {

public ActionForward execute(ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response)

throws IOException, ServletException {

//TODO: cannot downcast

DynaValidatorForm loginForm = (DynaValidatorForm)form;

String username = (String)loginForm.get("username");

String password = (String)loginForm.get("password");

HttpSession session = request.getSession(true);

session.removeAttribute("username");

session.setAttribute("username", username);

ArrayList al = new ArrayList();

al.add(username);

al.add(password);

String prompt;

loginHandler login = new loginHandler();

if(login.checkLogin(al)){

prompt = "Success";

} else {

prompt = "Fail";

}

return mapping.findForward(prompt);

}

----------
3. Add ValidatorPlugin into struts-config.xml
struts-config.xml
--------------

<struts-config>

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

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

<set-property property="stopOnFirstError" value="false" />

</plug-in>

</struts-config>

4. Create validation.xml and validator-rules.xml in folder WEB-INF
validation.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE form-validation PUBLIC

"-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"

"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">

<form-validation>

<arg key="${var:minlength}" resource="false"

position="1" />

<var>

<var-name>minlength</var-name>

<var-value>3</var-value>

</var>

</field>

<arg key="${var:minlength}" resource="false"

position="1" />

<var>

<var-name>minlength</var-name>

<var-value>3</var-value>

</var>

</field>

</form>

</formset>

</form-validation>

-----------------------------------
validtor-rules.xml

<!DOCTYPE form-validation PUBLIC

"-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.1.3//EN"

"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">

<!--

$Id: validator-rules.xml,v 1.1 2006/07/21 12:40:26 nacid Exp $

This file contains the default Struts Validator pluggable validator

definitions. It should be placed somewhere under /WEB-INF and

referenced in the struts-config.xml under the plug-in element

for the ValidatorPlugIn.

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

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

/WEB-INF/validation.xml"/>

</plug-in>

These are the default error messages associated with

each validator defined in this file. They should be

added to your projects ApplicationResources.properties

file or you can associate new ones by modifying the

pluggable validators msg attributes in this file.

# Struts Validator Error Messages

errors.required={0} is required.

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

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

errors.invalid={0} is invalid.

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

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

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

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

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

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

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

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

errors.creditcard={0} is an invalid credit card number.

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

Note: Starting in Struts 1.2.0 the default javascript definitions have

been consolidated to commons-validator. The default can be overridden

by supplying a <javascript> element with a CDATA section, just as

in struts 1.1.

-->

<form-validation>

<validator name="required"

classname="org.apache.struts.validator.FieldChecks"

method="validateRequired"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

msg="errors.required"/>

<validator name="requiredif"

classname="org.apache.struts.validator.FieldChecks"

method="validateRequiredIf"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

msg="errors.required"/>

<validator name="validwhen"

msg="errors.required"

classname="org.apache.struts.validator.validwhen.ValidWhen"

method="validateValidWhen"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"/>

<validator name="minlength"

classname="org.apache.struts.validator.FieldChecks"

method="validateMinLength"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.minlength"

jsFunction="org.apache.commons.validator.javascript.validateMinLength"/>

<validator name="maxlength"

classname="org.apache.struts.validator.FieldChecks"

method="validateMaxLength"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.maxlength"

jsFunction="org.apache.commons.validator.javascript.validateMaxLength"/>

<validator name="mask"

classname="org.apache.struts.validator.FieldChecks"

method="validateMask"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.invalid"/>

<validator name="byte"

classname="org.apache.struts.validator.FieldChecks"

method="validateByte"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.byte"

jsFunctionName="ByteValidations"/>

<validator name="short"

classname="org.apache.struts.validator.FieldChecks"

method="validateShort"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.short"

jsFunctionName="ShortValidations"/>

<validator name="integer"

classname="org.apache.struts.validator.FieldChecks"

method="validateInteger"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.integer"

jsFunctionName="IntegerValidations"/>

<validator name="long"

classname="org.apache.struts.validator.FieldChecks"

method="validateLong"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.long"/>

<validator name="float"

classname="org.apache.struts.validator.FieldChecks"

method="validateFloat"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.float"

jsFunctionName="FloatValidations"/>

<validator name="double"

classname="org.apache.struts.validator.FieldChecks"

method="validateDouble"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.double"/>

<validator name="date"

classname="org.apache.struts.validator.FieldChecks"

method="validateDate"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.date"

jsFunctionName="DateValidations"/>

<validator name="intRange"

classname="org.apache.struts.validator.FieldChecks"

method="validateIntRange"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends="integer"

msg="errors.range"/>

<validator name="floatRange"

classname="org.apache.struts.validator.FieldChecks"

method="validateFloatRange"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends="float"

msg="errors.range"/>

<validator name="doubleRange"

classname="org.apache.struts.validator.FieldChecks"

method="validateDoubleRange"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends="double"

msg="errors.range"/>

<validator name="creditCard"

classname="org.apache.struts.validator.FieldChecks"

method="validateCreditCard"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.creditcard"/>

<validator name="email"

classname="org.apache.struts.validator.FieldChecks"

method="validateEmail"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.email"/>

<validator name="url"

classname="org.apache.struts.validator.FieldChecks"

method="validateUrl"

methodParams="java.lang.Object,

org.apache.commons.validator.ValidatorAction,

org.apache.commons.validator.Field,

org.apache.struts.action.ActionMessages,

org.apache.commons.validator.Validator,

javax.servlet.http.HttpServletRequest"

depends=""

msg="errors.url"/>

<!--

This simply allows struts to include the validateUtilities into a page, it should

not be used as a validation rule.

-->

<validator name="includeJavaScriptUtilities"

classname=""

method=""

methodParams=""

depends=""

msg=""

jsFunction="org.apache.commons.validator.javascript.validateUtilities"/>

</global>

</form-validation>

--------------------------
5. Add content in ApplicationResources.properties.
ApplicationResources.properties.
----------------------------

#Info

label.username = username

label.password = password

#Error

errors.required={0} can not be null

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

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

errors.invalid={0} is invalid

6. Use Action in .jsp files.
login.jsp

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

<%@ page contentType="text/html; charset=gb2312"%>

<html:html>

<head>

<title>Login Page</title>

</head>

<body>

<html:form action="/loginAction" method="post"

onsubmit="return validateLoginActionForm(this)">

Username: <html:text property="username" size="15" />

<br />

Password: <html:password property="password" size="15" />

<br />

<html:submit property="submit" value="login" />

<html:javascript formName="loginActionForm" />

</html:form>

</body>

</html:html>