Where Key Will Be Generated In Struts

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Written by Nam Ha Minh
Last Updated on 01 August 2019 | Print Email
The required field validator in Struts can be used to check if field is non-null. It can be used in either of the following forms:
    • XML: using type=”required” attribute in <validator> or <field-validator> elements.
    • Annotation: using @RequiredFieldValidator annotation type to annotate setter method of the field or action method (plain-validator).
One example usage of this validator is to validate a field whose value is pulled from a dropdown list which may contain no items (the items are generated dynamically).

1. Struts Required Field Validator XML

Usage:
  • Field-validator syntax:
  • Plain-validator syntax:

Parameters:

Parameter name

Description

fieldName

Name of the field to validate. Required if using plain validator syntax.

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Struts Required Field Validator XML Examples:

  • Field-validator example:
  • Plain-validator example:

2. Struts @RequiredFieldValidator Annotation

Where Key Will Be Generated In Struts 2017

Usage:

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@RequiredFieldValidatorannotation before the setter method or action method (in case of using plain-validator) in the following form:

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@RequiredFieldValidator(param1 = 'param 1 value', param2 = 'param 2 value', ..)

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Parameters:

Parameter name

Required

Default value

Description

message

Yes

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validation error message.

key

No https://totalnin.netlify.app/generate-new-api-key-kodi.html.

i18n key for validation error message.

messageParams

No

Additional parameters to customize the message.

fieldName

No

Specifies field name in case this validator type is plain-validator.

shortCircuit

No

false

Whether this validator is short circuit.

type

No

ValidatorType.FIELD

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type of the validator: field-validator (FIELD) or plain-validator (SIMPLE).

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Struts @RequiredFieldValidator Examples:

  • Basic field-validator:
  • Specifying i18n key for the message:
  • Plain-validator (annotating the action method):
Key

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Related Struts Form Validation Tutorials:

Other Struts Tutorials:

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Key

About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook.