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Spring MVC validation Configuration

Commons Validation

Pros:

Optimal use of use of resources: JavaScript validations are provided when JavaScript is enabled, and server-side validations are guaranteed.

A single point of maintenance: both client-side and server-side validations are generated from the same configuration and use the same error message.

Cons:

Lack of data conversions and transformations

The generated JavaScript is no modal, it does not engage until the form is submitted.

Spring Validation

Pros:

Server-side validation is easy to implement org.springframework.validation.Validator.

Use the same error message as commons validation. Easy internationalization.

Cons:

Spring client-side validation is in development progress, need standard version.

Configuration:

1. WEB-INF/validation-rules.xml

default validation rules such as email , creditcard, date validation rules.

2. WEB-INF/validation.xml

User-defined form validation rules.

<form-validation>

<formset>

<form>

<field property=”username” depends=”required”>

<arg0 key=”signonusername”/>

</field>

<field property=”password” depends=”required”>

<arg0 key=”signonpassword”/>

</field>

<field property=”lastName” depends=”required”>

<arg0 key=”accountfirstname”/>

</field>

<field property=”firstName” depends=”required”>

<arg0 key=”accountlastname”/>

</field>

<field property=”email” depends=”required, email”>

<arg0 key=”accountemail”/>

</field>

</form>

</formset>

</form-validation>

3. Web-INF/dms-servlet.xml add bean configuration

<bean class=”org.springmodules.commons.validator.DefaultValidatorFactory”>

<property name=”validationConfigLocations”>

<list>

<value>/WEB-INF/validator-rules.xml</value>

<value>/WEB-INF/validation.xml</value>

</list>

</property>

</bean>

<!–  Validating the Spring way –>

<bean id=”userValidator”/>

<!–Commons Validation define –>

<bean class=”org.springmodules.commons.validator.DefaultBeanValidator”>

<property ref=”validatorFactory”/>

</bean>

4.Web-INF/dms-servlet.xml Add validator property in Spring contoller

<bean id=”createUserController”>

<property name=”commandName” value=”account”/>

<property name=”formView” value=”createUser”/>

<property name=”successView” value=”redirect:logout.jsp”/>

<property name=”serviceLocator” ref=”serviceLocator”/>

<property name=”validators”>

<list>

<ref bean=”beanValidator”/>      <!–Commons Server-side validation –>

<ref bean=”userValidator”/>       <!–Spring validation –>

</list>

</property>

5. WEB-INF/classes/message_en_US.properties (English version) Add error message for the validation.

# — validator errors –

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.

6. Add class Dms.view.validator.UserValidator Spring server-side validator class.

7. Modify taglibs.jsp add jsp file tag definition

<%@ tglib uri=”http://www.springmodules.org/tags/commons-validator” prefix=”validator” %>

8. Modify /jsp/createUser.jsp add commons validation tag

Modify:

<form method=”post” action=”<c:url value=”/createUser.html”/>”>

Add in the last line:

<validator:javascript formName=”account”

staticJavascript=”false” xhtml=”true” cdata=”false”/>

<script

src=”<c:url value=”/scripts/validator.jsp”/>”></script>

9: Add /scripts/validator.jsp

<%@ page contentType=”javascript/x-javascript” %>

<%@ taglib uri=”http://www.springmodules.org/tags/commons-validator” prefix=”validator” %>

<validator:javascript dynamicJavascript=”false” staticJavascript=”true”/>

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