Validator - Included Validations
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By default, Validator comes packaged with several basic validation routines that you can use to solve most validation scenarios. As mentioned, the sample applications provided by Struts come packaged with preconfigured validator-rules.xml files that define these routines. Table 6-1 lists each of the preconfigured validations by logical name and states its purpose.
Note Detailed information on configuring the validator-rules.xml file is found in Chapter 18.
Validation | Description |
byte | Validates that the specified field contains a valid byte. |
creditCard | Validates that the specified field contains a valid credit card number. |
date | Validates that the specified field contains a valid date. |
double | Validates that the specified field contains a valid double. |
email | Validates that the specified field contains a valid e-mail address. |
float | Validates that the specified field contains a valid float. |
floatRange | Validates that the specified field contains a valid float and falls within the |
| specified range. |
integer | Validates that the specified field contains a valid integer. |
intRange | Validates that the specified field contains a valid integer and falls within the |
| specified range. |
long | Validates that the specified field contains a valid long. |
TABLE 6-1 Validator’s Preconfigured Validations
Validation | Description |
mask | Validates that the specified field conforms to a given regular expression (or "mask"). |
maxlength | Validates that the string in the specified field’s length is less than or equal to the |
| specified maximum length. |
minlength | Validates that the string in the specified field’s length is greater than or equal to |
| the specified minimum length. |
range | Deprecated |
| Use the intRange validation instead. |
required | Validates that the specified field contains characters other than white space |
| (i.e., space, tab, and newline characters). |
requiredif | Performs the required validation on the specified field if a specified rule is met. |
short | Validates that the specified field contains a valid short. |
TABLE 6-1 Validator’s Preconfigured Validations (continued)
Next: Creating Form Beans >>
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 This article is taken from chapter six of the book The Complete Reference Struts, written by James Holmes (McGraw-Hill/Osborne, 2004; ISBN: 0072231319). Check it out at your favorite bookstore. Buy this book now.
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