Struts

Introduction:

Validation subfranework is a set of predefine validations which encapsulates validation logic for common validation task. This framework consist of following components

1. Validator: Validator are predefine classes which contends validation logic for common validation.
2. Validation MetaData: Validation metadata is an XML file that assign a logic name to predefine.
3. Validation mapping : Validation mapping is a XML file provide a application developer which associated action field to validator.
4. Validation Interceptor: This interceptor is responsible for applying validation on action properties using predefine validators.

Class/Library File Descriptions:

• required: The required validators is used to checked wither a field has some value or not. Empty string are considered value by this validators.
• requiredstring: Same as required accept empty string are not concerned value.
• int ,double and date: Are used to checked weather an integer, real, number or date is within range or not.
• email: This interceptor is used to checked weather a mailed is proper formate or not.
• URL : The url interceptor is used to checked weather a url is proper formate or not.
• stringlength: The String length is used to checked weather length of string lies within range or not.
• regex : The regex interceptor is used to checked value of a field using a regular expiration.