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Validating input in java

Input validation is absolutely critical to application security, and most application risks involve tainted input at some level.Many applications do not plan input validation, and leave it up to the individual developers.Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.

The chars can be numbers, parentheses(), hypens, periods & may contain sign in the beginning and can contain whitespaces in between.

For example, if you have a text box that must contain a postal code, you can perform the validation in the following ways: The Validating event is supplied an object of type Cancel Event Args.

If you determine that the control's data is not valid, you can cancel the Validating event by setting this object's Cancel property to .

When you use data binding, the data in your control is synchronized with the data source during execution of the Validating event.

If you cancel the Validating event, the data will not be synchronized with the data source.

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