Advanced Java Programming
Lecture15-Struts Validation Framework,
DynaActionForm
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Struts Validation Framework and DynaActionForm in Advanced Java Programming, Slides of Java Programming
An overview of the struts validation framework and dynaactionform in advanced java programming. It covers the issues addressed by dynaactionform, the configuration and usage of dynaactionform and validation framework, the types supported by dynaactionform, and the validation process. The document also includes examples from struts-config.xml and struts-examples.
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Advanced Java Programming
Lecture 15 - Struts Validation Framework, DynaActionForm
Topics
DynaActionForm
Validation Framework
How to configure and use validation framework validations-rules.xml validations.xml How to use DynaActionForm with validation framework Client side validation with JavaScript I 18 N and validation Custom validation
Why DynaActionForm?
Issues with using ActionForm
ActionForm class has to be created in Java programming language For each HTML form page, a new ActionForm class has to be created Every time HTML form page is modified (a property is added or removed), ActionForm class has to be modified and recompiled
DynaActionForm support is added to Struts 1.1 to
address these issues
What is DynaActionForm?
org.apache.struts.action.DynaActionForm
extends ActionForm class
In DynaActionForm scheme,
Properties are configured in configuration file rather than coding reset() method resets all the properties back to their initial values You can still subclass DynaActionForm to override reset() and/or validate() methods Version exists that works with Validator framework to provide automatic validation
Example from struts-examples **<form-beans>
Types Supported by DynaActionForm java.lang.BigDecimal, java.lang.BigInteger boolean and java.lang.Boolean byte and java.lang.Byte char and java.lang.Character java.lang.Class, double and java.lang.Double float and java.lang.Float int and java.lang.Integer long and java.lang.Long short and java.lang.Short java.lang.String java.sql.Date, java.sql.Time, java.sql.Timestamp
How to perform Validation with
DynaActionForm?
DynaActionForm does not provide default behavior
for validate() method
You can subclass and override validate() method but it is not recommended
Use Validator Framework
Use DynaValidatorForm class (instead of DynaActionForm class) DynaValidatorForm class extends DynaActionForm and provides basic field validation based on an XML file
Example from strut-example sample
application
**<form-beans>
SubscriptionForm class
public final class SubscriptionForm extends ActionForm { ... public String getAction() { return (this.action); } public void setAction(String action) { this.action = action; } ... public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { ... } ... }
struts-config.xml: Regular ActionForm class (actually extension of it)
Why Struts Validation Framework?
Issues with writing validate() method in ActionForm
classes
You have to write validate() method for each ActionForm class, which results in redundant code Changing validation logic requires recompiling
Struts validation framework addresses these issues
Validation logic is configured using built-in validation rules as opposed to writing it in Java code
What is Struts Validation Framework?
Originated from “ generic ” Validator framework from
Jakarta
Struts 1.1 includes it by default
Allows declarative validation for many fields Formats Dates, Numbers, Email, Credit Card, Postal Codes Lengths Minimum, maximum Ranges Regular expressions
Validation Framework: How to configure and use Validation framework?