Mask Rule Rules in Validator Framework
Mask Rule Rules in Validator Framework
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The Mask Rule Rules is flexible and eliminates the need for writing a lot of custom validation rules.The mask rule uses Perl 5-style regular expression.
When you use the mask rule, you are implementing the rule in regular expression syntax instead of java.Since you are writing your own rule ,starting with a blank state if you will, the default message often does not make sense.
The following step for using the mask rule and defining your own custom message are:-
1. Specify that the user name field correspond to the mask rule.<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%> <%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%> <html> <body> <html:form action="/userAction" > <table> <tr><td> User Name : </td> <td> <html:text property="userName" /> </td> <td><html:errors property="userName" /> </td></tr> <tr><td>Registration Number : </td> <td> <html:text property="registrationno" /> </td> <td> <html:errors property="registrationno" /> </td> </tr> <tr> <td colspan="4" align="center"> <html:submit /> </td> </tr> </table> </html:form> </body> </html>2. Specify an error message key for mask rule.
3. Add the error message for the mask rule to the resource bundle.# Resources for parameter 'com.yourcompany.struts.ApplicationResources' # Project maskrulesvalidation errors.integer={0} must be an integer. errors.general=The process did not complete.Details should follow. errors.token=Request could not be completed.Operation is not in sequence. userForm.username.mask = {0} should contain only alphabets. userForm.registrationno.mask = {0} should contain only numbers. userForm.username = User Name userForm.registrationno =Registration No4. Configure the value of the mask variable to a pattern that implements yo business rules.<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE form-validation PUBLIC "-//Apache Software Foundation//DTD Commons Validator Rules Configuration 1.3.0//EN" "http://jakarta.apache.org/commons/dtds/validator_1_3_0.dtd"> <form-validation> <formset> <form name="userForm"> <field property="userName" depends="required,mask"> <msg name="mask" key="userForm.username.mask" /> <arg key="userForm.username"/> <var> <var-name>mask</var-name> <var-value>^[a-zA-Z]*$ </var-value> </var> </field> <field property="registrationno" depends="required,mask"> <msg name="mask" key="userForm.registrationno.mask" /> <arg key="userForm.registrationno"/> <var> <var-name>mask</var-name> <var-value>^[0-9]*$</var-value> </var> </field> </form> </formset> </form-validation>struts-config.xml<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd"> <struts-config> <form-beans> <form-bean name="userForm" type="org.apache.struts.validator.DynaValidatorForm" > <form-property name="userName" type="java.lang.String" /> <form-property name="registrationno" type="java.lang.String" /> </form-bean> </form-beans> <global-exceptions /> <global-forwards /> <action-mappings> <action input="/user.jsp" name="userForm" path="/userAction" scope="request" type="r4r.co.in.UserAction"> <forward name="success" path="/thank.jsp" /> </action> </action-mappings> <message-resources parameter="r4r.co.in.ApplicationResources" /> <plug-in className="org.apache.struts.validator.ValidatorPlugIn"> <set-property property="pathnames" value="/org/apache/struts/validator/validator-rules.xml,/WEB-INF/validation.xml"/> </plug-in> </struts-config>
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